The Critical Role of
Breaker Testing

Prime Power uses state-of-the-art breaker testing equipment with a computer interface to automatically generate and store accurate, professional, un-editable reports.

Accuracy is held within 1% for trip currents and .0004 seconds for response times. Primary injection testing also provides our technicians and engineers the opportunity to fully inspect the breaker and breaker cell for:

  • Functionality of the breaker's electrical operators (close, open, charging, etc.)
  • Proper lubrication of the breaker's draw-out mechanism and current carrying contacts
  • Cleanliness and security of the breaker's secondary contacts and connections
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Types of Breaker Testing

Primary Injection Testing

This test is accomplished utilizing a large and heavy test set capable of delivering the required test current utilizing substantial test power that may not be readily available. Injection of overload and fault level magnitude currents through a circuit breaker or protective device current transformers to determine if the device is performing within specifications. Difficulties with field testing of circuit breakers is one reason behind the development of electronic trip units.

Secondary Injection Testing

Secondary injection testing involves simulating overload and fault level magnitude currents on the current transformer's secondary side to verify the trip characteristics, trip actuator, and latch mechanism. Secondary test sets are lightweight, easier to operate, do not require the circuit breaker to be removed from the assembly, involve substantially less test power, and allow testing to be performed faster with reduced downtime.