System information

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Masterpact™ NT and NW Universal Power Circuit Breakers

Masterpact™ Circuit Breakers

05/2014

Reduced Maintenance: Under normal operating conditions, the circuit

breaker does not require maintenance. However, if maintenance or inspection

is necessary, the arc chambers are easily removed so you may visually

inspect the contacts and wear indicator groove (see the figure below for how

wear is indicated). The operation counter can also indicate when inspections

and possible maintenance should be done. The life of the circuit breaker may

be extended by replacing the arc chamber and spring-charging motor and/or

replacing the main contact assembly of ANSI Certified circuit breakers.

Figure 4: Contact Wear Indicators

Arc Chamber