top of page

SCOT M3K Circuit Breaker Coil Tester

The SCOT M3K is a compact, portable circuit breaker coil tester designed to evaluate the performance of trip, close, and spring-charging coils in MV and HV circuit breakers. It measures coil current, resistance, operating time, and energy, helping technicians diagnose mechanical faults, coil degradation, and malfunctions in breaker mechanisms. Its rugged build and intuitive interface make it ideal for substation field testing and maintenance teams.

Key Features

  • Tests trip coils, close coils, and spring-charging coils

  • Measures:

    • Coil current waveform

    • Coil resistance

    • Operating time

    • Coil energy & peak current

  • Built-in trigger, timing, and recording functions

  • High sampling rate for accurate waveform capture

  • USB/PC connectivity for report output

  • Overload & polarity protection

  • Lightweight and portable — ideal for field crews

Technical Specifications

Parameter Specification
Test Voltage Supports AC/DC coil circuits up to 300 V
Output Current Up to 30 A peak
Resistance Range 0.1 Ω – 10 kΩ
Current Accuracy ±1 %
Timing Accuracy ±0.1 ms
Sampling Rate Up to 20 kHz
Display Backlit LCD
Communication USB interface for data export
Power Supply 220 V AC ±10 %
Dimensions Portable handheld unit
Weight Approx. 3 kg

Standard Accessories

  • Test leads (current + voltage)

  • USB cable

  • Power adaptor

  • Carry case

  • User manual & certificate

Applications

  • Testing MV/HV breaker trip coils, close coils, and spring-charge motors

  • Diagnosing coil burn, wear, or mechanical sticking

  • Breaker refurbishment QA testing

  • Routine maintenance in substations and switchyards

Optional Add-Ons

  • Extended leads

  • Hard-shell rugged case

  • PC analysis software

bottom of page