200A Circuit Breaker Contact Resistance Tester Digital Micro-Ohmmeter and Loop Resistance Test Set for High Voltage Switchgear, Isolator and Busbar Testing

The 200A Circuit Breaker Contact Resistance Tester is designed specifically for measuring the static contact resistance of high- and medium-voltage switching equipment.

The instrument injects a controlled DC current into the test circuit and measures the corresponding voltage drop to calculate contact resistance in the micro-ohm range.

It is particularly suitable for circuit breaker commissioning, preventive maintenance, factory testing and substation inspection.

Modern contact resistance testers commonly offer selectable current levels and micro-ohm resolution, with 200A being a widely used configuration.

• Circuit breaker static contact resistance
• Main contact resistance
• Switchgear contact resistance
• Isolator contact resistance
• Busbar connection resistance
• Disconnector resistance
• Electrical contact quality evaluation
• Micro-ohm measurement
• High-current DC injection
• Test result recording
• Automatic calculation

• Power substations
• Electrical utilities
• Switchgear manufacturers
• Circuit breaker manufacturers
• Electrical maintenance companies
• Testing laboratories
• Industrial power systems

• Fast measurement
• High repeatability
• Digital display
• Portable field operation
• Data storage
• Optional printer
• PC communication
• Easy test operation

Q: What current should I choose, 100A or 200A?
A: The appropriate test current depends on the applicable test standard, equipment requirements and customer's testing procedure. 100A and 200A are common configurations.

Q: What resistance range can be measured?
A: It depends on the selected current and model. Typical systems cover micro-ohm to milliohm ranges. For example, some 200A models specify ranges around 0–20 mΩ with 0.1 μΩ resolution.

Q: Can it be used on site?
A: Yes. Portable contact resistance testers are commonly designed for field maintenance and commissioning.