Static Contact Resistance - AIS

The static contact resistance or micro-ohm measurement belongs to the most important tests on circuit breakers. The test verifies whether the resistance of the current carrying contacts allows the flow of rated current within specified losses. The resistance depends on contact surface properties which are the connection points on micro-scopic level, the contact pressure and the oxidation of the surface. A temperature increase above the specified limits changes the electrical contact surface properties which then leads to an increase of losses. This self-accelerated process can develop constantly over years until it accelerated dramatically at the end. Typical resistances values are between 10 to 100 μΩ.

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All important tests on breakers

CIBANO 500 combines a micro-ohmmeter, timing analyzer, and a coil and motor supply. All important circuit breaker tests on all types of breakers can be carried out even when a station battery is not available.

Powerful integrated supply

The integrated power supply can output a highly accurate, digitally generated output signal of up to 2.4kW.

High measurement accuracy

Using four measurement ranges, CIBANO 500 can accurately determine contact resistances with an accuracy of better than 1 µΩ.

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COMPANO 100

The multifunctional COMPANO 100 provides up to 100 A DC to measure static contact resistance.

COMPANO 100

Primary injection, secondary injection and basic protection test set

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CPX 200

CPX 200 performs highly accurate static contact resistance measurements for circuit breakers up to 1000 A DC. It’s designed for extended output cycles, ensuring that current transformers are properly saturated. When working in tight spaces, the high-current cable and clamp can be separated, enabling the cable to be mounted directly to suitable access connectors.

CPXpert allows for phase-by-phase or interrupter-by-interrupter comparisons within each phase.