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.