Replacing The Circuit Breaker Internal Contact Assemblies - Siemens UL 1066 Operating Instructions Manual

23.6 Replacing the circuit breaker internal
contact assemblies
If the circuit breaker's internal contacts need to be replaced following an inspection, this can be done using the following procedure.
When replacing the circuit breaker's internal contacts, it is recommended that all three poles be replaced at the same time. It is also required
that the arc chutes be replaced when the breaker internal contacts be replaced at the same time. See
replacement arc chutes.
Hazardous voltage.
Will cause death, serious personal injury, or equipment damage.
Turn off and lock out all power supplying this device before working on this device.
High speed moving parts.
Can cause serious personal injury.
Discharge the closing spring before inspection and before carrying out any work on the circuit breaker.
NOTE
Pole assemblies are not field-replaceable for frame size III, M-class circuit breakers.
- OPEN the circuit breaker and discharge the closing spring
- Remove the circuit breaker from the cradle

DANGER
WARNING
 (page 23-3)
 (page 23-2)
Checking arc chutes (page 23-5) for
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