Circuit breaker testing and diagnostics
Measurement, functional testing, and technical condition assessment to identify deviations and assess results in conjunction.
To measure is to know
"A low contact resistance alone does not always mean the main contact of the circuit breaker is in good condition."
But a single measurement does not tell the whole story. Targeted inspections, electrical and mechanical measurements, protection relay testing, and functional checks are combined when technically relevant. Diagnostics is more than collecting isolated measurement values.
- Contact resistance measurement
- Insulation resistance measurement
- Primary current injection
- Circuit breaker timing
- Opening and closing times
- Pole synchronism
- Coil current analysis
- Mechanical operation
- Testing of electronic trip units
- Secondary current injection
- Protection relay testing
- Closing coil
- Shunt trip
- Undervoltage release
- Motor charging mechanism
- Auxiliary contacts
- Functional operation
Testing versus Diagnostics
Testing
Specifically determining whether a function, protection, or component responds according to the relevant test method, setting, or technical expectation.
Diagnostics
Combining various observations and measurement results to better understand the technical condition, deviation, or possible root cause.
Low voltage and medium voltage
Low voltage
- ACB
- MCCB
- Trip units
- Primary or secondary injection
- Contact resistance
- Functional checks
Medium voltage
- VCB
- SF₆ circuit breakers
- Timing
- Contact resistance
- Vacuum integrity
- Protection relays
- Secondary injection
From measurement to technical advice
Results can lead to, for example:
Request test or technical assessment
Provide us with as many details as possible for a targeted response.
- Manufacturer and type
- Nameplate data
- Overview photos
- Description of required test or problem
- Relevant settings/documentation (if available)