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    • Home 2 AC Powered EV Charger
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      • Back
      • Diode and RC Supressors
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    • Meters for Electric Vehicle Chargers
    • E-Bike Technology
    • Split Core Current Transformers
    • Split Core AC Current Sensors with Process Outputs
    • DC Current Sensors with Process Outputs
    • Hall Effect Current Sensors
    • Hall Effect Current Sensors PCB Mount
    • Hall Effect Voltage Transducers
    • Din Rail Mount Energy Transducers
  • Process Control
    • Temperature/Humidity Controllers
      • Back
      • 48x24mm Panel Mount
      • 48x48mm Panel Mount
      • 48x96mm Panel Mount
      • 96x96mm Panel Mount
      • Dual Loop Temperature and Humidity
      • 98x48mm Indicators
      • Pattern Controllers
      • Limit Controllers
      • PWM Controllers
      • Refigeration Controllers
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      • Back
      • BSP Fittings and TC Cable
      • RTD's
      • Thermocouples
      • Bimetal Switches
      • Air Temp & Humidity Sensors
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      • Solid Core AC Current Transformers with Process Outputs
      • Split Core AC Current Transformers with Process Outputs
      • DC Current Sensors with Process Outputs
    • Motors & Motor Control
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      • Motor Protection Breakers
      • Motors, Alternators, Starter Motors
      • Speed Relays, Encoders, PWM Contactors
      • Din Rail Mount Contactors
    • Programmable Logic Controllers (PLC)
    • HMI Touch Screens
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    • Mechanical Relays
    • Hour Meters
    • Microswitches
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    • Phase Angle Power Controllers
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      • Thyristor (SCR Based)
      • Solid State Relay (SSR) Based
    • Burst Fire Power Controllers
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      • Thyristor (SCR Based)
      • Solid State Relay (SSR) Based
    • Accessories/Spare parts and OEM Power Controller card sets
    • Pulse Transformers
    • Power Factor Controllers
    • PWM Controllers (HVAC)
  • Power Quality
    • EMC Filters
    • IEC Power Sockets & Plugs
      • Back
      • Sockets with Filter
      • Socktes and plugs without Filter
    • Power Factor Correction
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      • 3 Phase PFC Capacitors
      • Single Phase PFC Capacitors
      • MV Power Factor Capacitors
      • Capacitor Duty Contactors
      • SVG Modules & Smart Capacitor Banks
      • PFC Controllers
      • Power Factor Meters and Transducers
      • Detuned Reactors
    • Pulse Transformers
    • Chokes
    • Smart Sub Meters and Power Quality Analysers
    • Utility Scale Meters
  • Electrical Measurement
    • Hall Effect Current Sensors/Transducers
      • Back
      • Split Core AC Current Sensors Process Output
      • Solid Core AC Current Sensors with Process Outputs
      • DC Current Sensor with Process Outputs
      • Panel Mount
      • Busbar Mount
      • Surface Mount
      • PCB Mount
      • Automotive Sensors
      • LEM Accessories
    • Hall Effect Voltage Sensors/Transducers
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      • PCB Mount
      • Panel Mount
    • Current Transformers
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      • Solid Core
      • Split Core
      • Solid Core with Process Output
      • Split Core with Process Output
      • Core Balance CT's
    • Rogowski Coils (Rope CT's)
    • High Frequency 20Mhz or DC Current Sensors
    • High Precision Hall Effect Sensors
    • Clamp On Current Sensors
    • Signal Conditioners
    • Din Rail Mount Transducers
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      • Current
      • Voltage
      • Power
    • Digital Panel Meters
    • Synchronometers
    • kWh Meters
    • Utility Smart Meters, Tariff, ICG Meters
    • Power Quality Meters and Analysers
    • Moving Coil Meter
  • Power Capacitors
    • Snubber Capacitors
    • Power Factor Correction
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      • Medium Voltage up to 22kV
      • Single Phase 525V
      • 3 Phase 525V
    • DC Link & Electrolytic Capacitors
    • 3 Phase 525V Power Factor Correction Capacitors
  • Power Semiconductors
    • Bridge Rectifiers
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      • Single Phase
      • Three Phase
    • Isolated Power Modules
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      • Dual Diode Modules
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      • Single Thyristor(SCR) Modules
      • Common Cathode Modules
    • Stud Mount Diodes and Thyristors(SCR)
      • Back
      • Metric Stud Diodes & Thyristors(SCR)
      • Imperial Diodes and Thyristors(SCR)
      • Flat Base Diode and Thyristor(SCR)
    • Capsule (PUK) Devices
      • Back
      • Diode Capsules
      • Thyristor(SCR) Capsules
    • Press Fit Diodes
    • IGBT
      • Back
      • IGBT Devices
      • IGBT Drivers
    • Other Welding & Generator Diodes
    • Silicon Carbide Modules
    • Discrete Components (limited)
    • Semiconductor Fuses
      • Back
      • BS88 Style Fuse Links
      • European NH Style Fuses
      • Cartridge Fuses & DIN Rail Holders
      • Fuse Kits for Gear Tray
      • Solar Fuses for DC or AC
  • Solid State Relays
    • AC Control Solid Sate Relays
    • DC Control Solid Sate Relays
    • AC Switching Solid State Relays
    • DC Switching Solid State Relays
    • Proportional Phase/Burst SSR
    • 3 Phase Solid State Relays
    • Solid State Relay Heatsink
    • 3 Phase Solid State Relays On Heatsink
    • Solid State Relay & Heatsink Assembled
      • Back
      • AC Load
      • DC Load
      • 3 Phase
    • PCB Mount
    • Slimline & Socket Din Rail Mount
    • Solid State Contactors
    • Cartridge Fuses up to 125 Amp
  • Contactors
    • AC/DC Contactors (IP67K)
      • Back
      • TVS Supression Diodes
    • DIN Rail Mount AC Contactors
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      • Auxiliary Contacts
      • Thermal Overload Relays
      • Diode and RC Supressors
    • Miniature Contactors
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      • Auxiliary Contacts
      • Thermal Overload Relays
      • Diode and RC Supressors
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      • Auxiliary Contacts & Terminal Covers
    • Capacitor Duty Contactors
    • MV and HV Contactors
    • Solid State Contactors
    • Motor Protection Switches
  • Relays
    • Monitoring Relays
    • Standard DIN Rail Mount Relays
    • Slimline Relays & Sockets
    • Bistable Relays
    • Time Relays
    • Earth Leakage Relays
    • Diode and RC Supressors
  • Energy Monitoring
    • DIN Rail Mount Transducers
      • Back
      • Current
      • Voltage
      • Power
    • kWh Meters
    • Current Transformers
    • Rogowski Coils (Rope CT's)
    • Monitoring Relays
    • Synchrometers
    • Wi-LEM Wireless Energy Monitoring
    • Ergo Energy Monitoring Software
    • Smart Sub-Meters and Power Quality Analysers
    • Battery Monitoring
    • Digital Panel Meter
    • Utility Smart Meters, Tariff, ICG Meters
  • Electrical Protection
    • Semiconductor Fuses
      • Back
      • BS88 Style Fuse Links
      • European NH Fuses
      • Cartridge Semiconductor Fuses/DIN Rail Holders
      • Fuse Kits for Gear Tray or Heatsink Mounting
      • Solar Fuses (New)
      • Automotive Power Fuses
    • Appliance & IEC Fuses
    • Appliance Thermal Circuit Breakers
    • Varistors (MOV)
    • Diode & RC Supressors
    • Surge Protection Devices
    • Snubber Capacitors
    • Earth Leakage Relays
    • Monitoring Relays
    • Mechanical Relays
    • Solar Fuses for DC or AC
    • Motor Protection Breakers
    • Residual Current Device (RCD)
    • Miniature Circuit Breakers (MCB)
    • DC Miniature Circuit Breakers (MCB)
    • RCBO's
  • Switches
    • Solar and Battery Switches
    • Momentary Switches
    • Metal Line Switches
    • Bistable Switches
    • Emergency Start Stop Buttons
    • Motor Protection Breaker
    • Low Voltage Disconnect Switches
    • DC Circuit Breakers
    • Appliance Circuit Breakers
    • Bimetal Thermal Switches
  • Heat Sink
    • Heatsink Extrusions
    • Cooling Fans
    • Heatsink for SSR's
    • Water Cooled
    • Natural Cooled
    • Fan Cooled
    • Clamps, Paste, Hardware
  • Stack Assemblies
    • Solid State Contactors
    • Bridge Rectifier Stacks
    • Water Cooled Stacks
    • High Voltage Diode Arrays
    • Welder/Charger Rectifier Stacks
    • Repair Accessories for Stacks
  • Test Equipment
    • High Precision Current Sensors
    • Precision Potentiometers
    • Power Semiconductor Test Equipment
    • Portable Meters & Power Quality Analysers
    • Clamp On Current Sensors
    • Synchrometers
    • High Frequency 20MHz or High DC Current Sensor
  • Low Voltage Switchgear
    • Motor Protection Switch
    • DC Circuit Breakers
    • DC Disconnect Switches
    • Metal Line Switches
    • Din Rail Mount Contactors
    • Standard Relays and Sockets
    • Bistable Relays
    • Slimline Relays and Sockets
    • Appliance Thermal Circuit Breakers
    • AC Disconnect Switches
    • Moulded Case Circuit Breakers (MCCB)
    • Miniature Circuit Breakers (MCB)
    • Residual Current Circuit Breakers (RCCB,RCD)
    • RCD with Circuit Breaker (RCBO)
    • Distribution Board Enclosures
    • Panel Indicators
    • Emergency Stop Buttons
    • Installation Contactors
    • RC and Transient Supressors
  • Appliance Connectors, Switches and Fuses
    • IEC Fuses
    • Fuse Holders
    • Micro Fuses (PCB)
    • Thermal Circuit Breakers & Rocker Switches
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    • Metal Line Switches
    • Thermoplastic Momentary Switches
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All Departments
  • E-Mobility
    • Home 2 AC Powered EV Charger
    • AC & DC Sealed Contactors
      • Back
      • Diode and RC Supressors
    • Automotive Fuses
    • Automotive Current Sensors
    • Meters for Electric Vehicle Chargers
    • E-Bike Technology
    • Split Core Current Transformers
    • Split Core AC Current Sensors with Process Outputs
    • DC Current Sensors with Process Outputs
    • Hall Effect Current Sensors
    • Hall Effect Current Sensors PCB Mount
    • Hall Effect Voltage Transducers
    • Din Rail Mount Energy Transducers
  • Process Control
    • Temperature/Humidity Controllers
      • Back
      • 48x24mm Panel Mount
      • 48x48mm Panel Mount
      • 48x96mm Panel Mount
      • 96x96mm Panel Mount
      • Dual Loop Temperature and Humidity
      • 98x48mm Indicators
      • Pattern Controllers
      • Limit Controllers
      • PWM Controllers
      • Refigeration Controllers
    • Temperature & Humidity Sensors
      • Back
      • BSP Fittings and TC Cable
      • RTD's
      • Thermocouples
      • Bimetal Switches
      • Air Temp & Humidity Sensors
    • AC/DC Current Sensors with Process Outputs
      • Back
      • Solid Core AC Current Transformers with Process Outputs
      • Split Core AC Current Transformers with Process Outputs
      • DC Current Sensors with Process Outputs
    • Motors & Motor Control
      • Back
      • Motor Protection Breakers
      • Motors, Alternators, Starter Motors
      • Speed Relays, Encoders, PWM Contactors
      • Din Rail Mount Contactors
    • Programmable Logic Controllers (PLC)
    • HMI Touch Screens
    • Signal Conditioners
    • Timers
    • Monitoring Relays
    • Rotary Encoders
    • Pressure/Pneumatic Components
    • Mechanical Relays
    • Hour Meters
    • Microswitches
  • Power Control
    • Phase Angle Power Controllers
      • Back
      • Thyristor (SCR Based)
      • Solid State Relay (SSR) Based
    • Burst Fire Power Controllers
      • Back
      • Thyristor (SCR Based)
      • Solid State Relay (SSR) Based
    • Accessories/Spare parts and OEM Power Controller card sets
    • Pulse Transformers
    • Power Factor Controllers
    • PWM Controllers (HVAC)
  • Power Quality
    • EMC Filters
    • IEC Power Sockets & Plugs
      • Back
      • Sockets with Filter
      • Socktes and plugs without Filter
    • Power Factor Correction
      • Back
      • 3 Phase PFC Capacitors
      • Single Phase PFC Capacitors
      • MV Power Factor Capacitors
      • Capacitor Duty Contactors
      • SVG Modules & Smart Capacitor Banks
      • PFC Controllers
      • Power Factor Meters and Transducers
      • Detuned Reactors
    • Pulse Transformers
    • Chokes
    • Smart Sub Meters and Power Quality Analysers
    • Utility Scale Meters
  • Electrical Measurement
    • Hall Effect Current Sensors/Transducers
      • Back
      • Split Core AC Current Sensors Process Output
      • Solid Core AC Current Sensors with Process Outputs
      • DC Current Sensor with Process Outputs
      • Panel Mount
      • Busbar Mount
      • Surface Mount
      • PCB Mount
      • Automotive Sensors
      • LEM Accessories
    • Hall Effect Voltage Sensors/Transducers
      • Back
      • PCB Mount
      • Panel Mount
    • Current Transformers
      • Back
      • Solid Core
      • Split Core
      • Solid Core with Process Output
      • Split Core with Process Output
      • Core Balance CT's
    • Rogowski Coils (Rope CT's)
    • High Frequency 20Mhz or DC Current Sensors
    • High Precision Hall Effect Sensors
    • Clamp On Current Sensors
    • Signal Conditioners
    • Din Rail Mount Transducers
      • Back
      • Current
      • Voltage
      • Power
    • Digital Panel Meters
    • Synchronometers
    • kWh Meters
    • Utility Smart Meters, Tariff, ICG Meters
    • Power Quality Meters and Analysers
    • Moving Coil Meter
  • Power Capacitors
    • Snubber Capacitors
    • Power Factor Correction
      • Back
      • Medium Voltage up to 22kV
      • Single Phase 525V
      • 3 Phase 525V
    • DC Link & Electrolytic Capacitors
    • 3 Phase 525V Power Factor Correction Capacitors
  • Power Semiconductors
    • Bridge Rectifiers
      • Back
      • Single Phase
      • Three Phase
    • Isolated Power Modules
      • Back
      • Dual Diode Modules
      • Dual Thyristor Modules
      • Thyristor(SCR)-Diode Modules
      • Single Diode Modules
      • Single Thyristor(SCR) Modules
      • Common Cathode Modules
    • Stud Mount Diodes and Thyristors(SCR)
      • Back
      • Metric Stud Diodes & Thyristors(SCR)
      • Imperial Diodes and Thyristors(SCR)
      • Flat Base Diode and Thyristor(SCR)
    • Capsule (PUK) Devices
      • Back
      • Diode Capsules
      • Thyristor(SCR) Capsules
    • Press Fit Diodes
    • IGBT
      • Back
      • IGBT Devices
      • IGBT Drivers
    • Other Welding & Generator Diodes
    • Silicon Carbide Modules
    • Discrete Components (limited)
    • Semiconductor Fuses
      • Back
      • BS88 Style Fuse Links
      • European NH Style Fuses
      • Cartridge Fuses & DIN Rail Holders
      • Fuse Kits for Gear Tray
      • Solar Fuses for DC or AC
  • Solid State Relays
    • AC Control Solid Sate Relays
    • DC Control Solid Sate Relays
    • AC Switching Solid State Relays
    • DC Switching Solid State Relays
    • Proportional Phase/Burst SSR
    • 3 Phase Solid State Relays
    • Solid State Relay Heatsink
    • 3 Phase Solid State Relays On Heatsink
    • Solid State Relay & Heatsink Assembled
      • Back
      • AC Load
      • DC Load
      • 3 Phase
    • PCB Mount
    • Slimline & Socket Din Rail Mount
    • Solid State Contactors
    • Cartridge Fuses up to 125 Amp
  • Contactors
    • AC/DC Contactors (IP67K)
      • Back
      • TVS Supression Diodes
    • DIN Rail Mount AC Contactors
      • Back
      • Auxiliary Contacts
      • Thermal Overload Relays
      • Diode and RC Supressors
    • Miniature Contactors
      • Back
      • Auxiliary Contacts
      • Thermal Overload Relays
      • Diode and RC Supressors
    • Installation Contactors
      • Back
      • Auxiliary Contacts & Terminal Covers
    • Capacitor Duty Contactors
    • MV and HV Contactors
    • Solid State Contactors
    • Motor Protection Switches
  • Relays
    • Monitoring Relays
    • Standard DIN Rail Mount Relays
    • Slimline Relays & Sockets
    • Bistable Relays
    • Time Relays
    • Earth Leakage Relays
    • Diode and RC Supressors
  • Energy Monitoring
    • DIN Rail Mount Transducers
      • Back
      • Current
      • Voltage
      • Power
    • kWh Meters
    • Current Transformers
    • Rogowski Coils (Rope CT's)
    • Monitoring Relays
    • Synchrometers
    • Wi-LEM Wireless Energy Monitoring
    • Ergo Energy Monitoring Software
    • Smart Sub-Meters and Power Quality Analysers
    • Battery Monitoring
    • Digital Panel Meter
    • Utility Smart Meters, Tariff, ICG Meters
  • Electrical Protection
    • Semiconductor Fuses
      • Back
      • BS88 Style Fuse Links
      • European NH Fuses
      • Cartridge Semiconductor Fuses/DIN Rail Holders
      • Fuse Kits for Gear Tray or Heatsink Mounting
      • Solar Fuses (New)
      • Automotive Power Fuses
    • Appliance & IEC Fuses
    • Appliance Thermal Circuit Breakers
    • Varistors (MOV)
    • Diode & RC Supressors
    • Surge Protection Devices
    • Snubber Capacitors
    • Earth Leakage Relays
    • Monitoring Relays
    • Mechanical Relays
    • Solar Fuses for DC or AC
    • Motor Protection Breakers
    • Residual Current Device (RCD)
    • Miniature Circuit Breakers (MCB)
    • DC Miniature Circuit Breakers (MCB)
    • RCBO's
  • Switches
    • Solar and Battery Switches
    • Momentary Switches
    • Metal Line Switches
    • Bistable Switches
    • Emergency Start Stop Buttons
    • Motor Protection Breaker
    • Low Voltage Disconnect Switches
    • DC Circuit Breakers
    • Appliance Circuit Breakers
    • Bimetal Thermal Switches
  • Heat Sink
    • Heatsink Extrusions
    • Cooling Fans
    • Heatsink for SSR's
    • Water Cooled
    • Natural Cooled
    • Fan Cooled
    • Clamps, Paste, Hardware
  • Stack Assemblies
    • Solid State Contactors
    • Bridge Rectifier Stacks
    • Water Cooled Stacks
    • High Voltage Diode Arrays
    • Welder/Charger Rectifier Stacks
    • Repair Accessories for Stacks
  • Test Equipment
    • High Precision Current Sensors
    • Precision Potentiometers
    • Power Semiconductor Test Equipment
    • Portable Meters & Power Quality Analysers
    • Clamp On Current Sensors
    • Synchrometers
    • High Frequency 20MHz or High DC Current Sensor
  • Low Voltage Switchgear
    • Motor Protection Switch
    • DC Circuit Breakers
    • DC Disconnect Switches
    • Metal Line Switches
    • Din Rail Mount Contactors
    • Standard Relays and Sockets
    • Bistable Relays
    • Slimline Relays and Sockets
    • Appliance Thermal Circuit Breakers
    • AC Disconnect Switches
    • Moulded Case Circuit Breakers (MCCB)
    • Miniature Circuit Breakers (MCB)
    • Residual Current Circuit Breakers (RCCB,RCD)
    • RCD with Circuit Breaker (RCBO)
    • Distribution Board Enclosures
    • Panel Indicators
    • Emergency Stop Buttons
    • Installation Contactors
    • RC and Transient Supressors
  • Appliance Connectors, Switches and Fuses
    • IEC Fuses
    • Fuse Holders
    • Micro Fuses (PCB)
    • Thermal Circuit Breakers & Rocker Switches
    • IEC Inlets & Sockets
    • IEC Inlets with Filters, Fuses, or Switches
    • Metal Line Switches
    • Thermoplastic Momentary Switches
  • DC Power Supplies
  • Communication Accessories
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  • E-Mobility
    • Back
    • Home 2 AC Powered EV Charger
    • AC & DC Sealed Contactors
      • Back
      • Diode and RC Supressors
    • Automotive Fuses
    • Automotive Current Sensors
    • Meters for Electric Vehicle Chargers
    • E-Bike Technology
    • Split Core Current Transformers
    • Split Core AC Current Sensors with Process Outputs
    • DC Current Sensors with Process Outputs
    • Hall Effect Current Sensors
    • Hall Effect Current Sensors PCB Mount
    • Hall Effect Voltage Transducers
    • Din Rail Mount Energy Transducers
  • Process Control Sale
    • Back
    • Temperature/Humidity Controllers
      • Back
      • 48x24mm Panel Mount
      • 48x48mm Panel Mount
      • 48x96mm Panel Mount
      • 96x96mm Panel Mount
      • Dual Loop Temperature and Humidity
      • 98x48mm Indicators
      • Pattern Controllers
      • Limit Controllers
      • PWM Controllers
      • Refigeration Controllers
    • Temperature & Humidity Sensors
      • Back
      • BSP Fittings and TC Cable
      • RTD's
      • Thermocouples
      • Bimetal Switches
      • Air Temp & Humidity Sensors
    • AC/DC Current Sensors with Process Outputs
      • Back
      • Solid Core AC Current Transformers with Process Outputs
      • Split Core AC Current Transformers with Process Outputs
      • DC Current Sensors with Process Outputs
    • Motors & Motor Control
      • Back
      • Motor Protection Breakers
      • Motors, Alternators, Starter Motors
      • Speed Relays, Encoders, PWM Contactors
      • Din Rail Mount Contactors
    • Programmable Logic Controllers (PLC)
    • HMI Touch Screens
    • Signal Conditioners
    • Timers
    • Monitoring Relays
    • Rotary Encoders
    • Pressure/Pneumatic Components
    • Mechanical Relays
    • Hour Meters
    • Microswitches
  • Power Control
    • Back
    • Phase Angle Power Controllers
      • Back
      • Thyristor (SCR Based)
      • Solid State Relay (SSR) Based
    • Burst Fire Power Controllers
      • Back
      • Thyristor (SCR Based)
      • Solid State Relay (SSR) Based
    • Accessories/Spare parts and OEM Power Controller card sets
    • Pulse Transformers
    • Power Factor Controllers
    • PWM Controllers (HVAC)
  • Power Quality
    • Back
    • EMC Filters
    • IEC Power Sockets & Plugs
      • Back
      • Sockets with Filter
      • Socktes and plugs without Filter
    • Power Factor Correction
      • Back
      • 3 Phase PFC Capacitors
      • Single Phase PFC Capacitors
      • MV Power Factor Capacitors
      • Capacitor Duty Contactors
      • SVG Modules & Smart Capacitor Banks
      • PFC Controllers
      • Power Factor Meters and Transducers
      • Detuned Reactors
    • Pulse Transformers
    • Chokes
    • Smart Sub Meters and Power Quality Analysers
    • Utility Scale Meters
  • Electrical Measurement
    • Back
    • Hall Effect Current Sensors/Transducers
      • Back
      • Split Core AC Current Sensors Process Output
      • Solid Core AC Current Sensors with Process Outputs
      • DC Current Sensor with Process Outputs
      • Panel Mount
      • Busbar Mount
      • Surface Mount
      • PCB Mount
      • Automotive Sensors
      • LEM Accessories
    • Hall Effect Voltage Sensors/Transducers
      • Back
      • PCB Mount
      • Panel Mount
    • Current Transformers
      • Back
      • Solid Core
      • Split Core
      • Solid Core with Process Output
      • Split Core with Process Output
      • Core Balance CT's
    • Rogowski Coils (Rope CT's)
    • High Frequency 20Mhz or DC Current Sensors
    • High Precision Hall Effect Sensors
    • Clamp On Current Sensors
    • Signal Conditioners
    • Din Rail Mount Transducers
      • Back
      • Current
      • Voltage
      • Power
    • Digital Panel Meters
    • Synchronometers
    • kWh Meters
    • Utility Smart Meters, Tariff, ICG Meters
    • Power Quality Meters and Analysers
    • Moving Coil Meter
  • Power Capacitors
    • Back
    • Snubber Capacitors
    • Power Factor Correction
      • Back
      • Medium Voltage up to 22kV
      • Single Phase 525V
      • 3 Phase 525V
    • DC Link & Electrolytic Capacitors
    • 3 Phase 525V Power Factor Correction Capacitors
  • Power Semiconductors
    • Back
    • Bridge Rectifiers
      • Back
      • Single Phase
      • Three Phase
    • Isolated Power Modules
      • Back
      • Dual Diode Modules
      • Dual Thyristor Modules
      • Thyristor(SCR)-Diode Modules
      • Single Diode Modules
      • Single Thyristor(SCR) Modules
      • Common Cathode Modules
    • Stud Mount Diodes and Thyristors(SCR)
      • Back
      • Metric Stud Diodes & Thyristors(SCR)
      • Imperial Diodes and Thyristors(SCR)
      • Flat Base Diode and Thyristor(SCR)
    • Capsule (PUK) Devices
      • Back
      • Diode Capsules
      • Thyristor(SCR) Capsules
    • Press Fit Diodes
    • IGBT
      • Back
      • IGBT Devices
      • IGBT Drivers
    • Other Welding & Generator Diodes
    • Silicon Carbide Modules
    • Discrete Components (limited)
    • Semiconductor Fuses
      • Back
      • BS88 Style Fuse Links
      • European NH Style Fuses
      • Cartridge Fuses & DIN Rail Holders
      • Fuse Kits for Gear Tray
      • Solar Fuses for DC or AC
  • Solid State Relays
    • Back
    • AC Control Solid Sate Relays
    • DC Control Solid Sate Relays
    • AC Switching Solid State Relays
    • DC Switching Solid State Relays
    • Proportional Phase/Burst SSR
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  • Fastron Electronics Store Home
  • Power Semiconductor Testing
  • Failed SCR/Diode Testing using a Standard Multimeter
Article

Failed SCR/Diode Testing using a Standard Multimeter

  • Power Semiconductor Testing
  • 12 Dec, 2019
  • Posted by: Daniel Rehe

How to Test for Failed Silicon Controlled Rectifier (SCR) Thyristor or Diode Using Multimeter

There are some simple ways you can test for failed SCR or Diode using a multiemeter and will dioagnose 95% of typical device failures. In our example we are looking at a egneric 160 Amp Dual Isolated Power Module MCC162-16io1 from IXYS. The same method can be applied to any type of SCR/Diode in or outside of a Bridge, AC switch circuit, or indiviuallly. With reference to the Gate, Cathode and Anode as the relevant pins we will connect to for tesing, the pins are the same for all reputable brands.

Diode vs SCR

SCR simply acts like a Diode when the gate voltage is applied, is it as in its name a Controlled Rectifer. To test the SCR or Diode we need to check for short or open circuit on the Anode to cathode and test for high impedance Anode to Cathode and from Gate to Cathode(SCR's only) which are the main failure modes.

1) Anode to Cathode Test for both Diodes and Thyristors (SCR)

Please set the multimeter to diode/short circuit test and make sure the probels are connected for voltage test. You then test both directions of the Diode/SCR by firmly conecting the positive(red) and negative(black) probes to Pin 2 to Pin 1, and Pin 3 to Pin 1

If the multimeter beeps there is a short circuit and the SCR has failed. if No beep connect the two probes from the multimeter together to ensure the multimeter is functioning properly. Then recheck the pins again from above.

For the diode you will expect to get a beep when testing the forward direction. I.e. Anode (postive-red probe), to Cathode (negative-black probe). 

Reverse bias test with Cathode (postive-red probe), to Anode (negative-black probe) should not give a beep. If the multimeter does beep then we can say the diode is failed.

For SCR you will get no been for both forward and reverse bias tests.

If there no beep we can confirm the SCR has not failed short circuit

2) Resistance Test to check for open/short circuit

As a secondary test we now switch the multimeter to resitance (Ohm) test mode. we then measure the Anode to cathode on both of the devices. You should see hundreds of kOhm to mOhm value. If the impedance is low, in the order of a few thousand kilohms or Ohm then it is a partial failure to short. This can reconfirm the above results or in soem cases indicate a partial failure or 'suspect' device as we call them in the industry.

3) SCR Gate Cathode Resistance Test

The last test is only for SCR's and is for testing the gate to Cathode on each SCR. Please use resitance test again and check Pin 5 to Pin 2, and Pin 6 to Pin 3. The impedance should be under 10 Ohm or around 10-50 Ohm. If it is very high then the gate is failed. This failure mode is the most likely failure whn the SCR control/firing card has esxperiened board failure. This can osccur due to lightning strikes or transient surges.

If these tests come up ok, and you are still experienicng issues please contact us and enquire about our in house device testing. We can take it a step further using some specialist test equipment we use in production.

We also sell suitable test equipment as follows.

  • Semiconductor Test Equipment
  • Handheld Multimeters and Power Quality Analysers

If you find you device is confirmed failed, we stock a complete range to Diode/SCR Modules, Capsules(PUK), and Stud Mount Devices to suit almost any application. 

Feel free to contact us for any further information

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