- Course 418.
- 1 Week.
- 1.6 CEU.
Molded and insulated case circuit breakers are two of the most common low-voltage circuit breakers found in industrial power systems. These types of circuit breakers are enclosed in an insulated housing.

An insulated case circuit breaker has an electronic trip unit that is fed from current transformers or sensors. A molded case circuit breaker has a thermal mechanism for long time operations for overcurrent and a magnetic mechanism for operating the circuit breaker instantaneously during a fault. Both types of circuit breakers are designed to be disassembled, inspected, adjusted and cleaned as long as the circuit breaker is not modified in any way. Both types require testing and maintenance to ensure system reliability. Proper maintenance performed by trained technicians can prevent nuisance trips, and ensure tripping operations execute as required for equipment protection. By ensuring correct fault clearing times, well maintained circuit breakers also minimize the arc flash hazard energy levels that technicians can be exposed to during a fault.
Participants in this course will be required to perform visual and electrical inspections on the circuit breakers and their auxiliary devices. The electrical inspections provide data regarding the condition of the insulation, contacts and operating mechanisms.
Who Should Attend
This hands-on course is intended for new or experienced electricians and technicians that install, maintain, repair or troubleshoot molded or insulated case circuit breakers, rated less than 1 kV, equipped with thermal, magnetic or solid state tripping devices. The participant should have basic knowledge of AC/DC electricity.