TM 55-4920-376-14&P
CIRCUIT BREAKER REPLACEMENT
4.12.4
If the circuit breaker refuses to remain in the ON position
under normal or no-load conditions, or if no power is delivered
when the handle is in the ON-position, the circuit breaker is
faulty and must be replaced. Proceed as follows:
a.
De-energize the circuit by detaching the external power
cable from external power source.
Remove the switch box cover by loosening the two retaining
b.
screws.
Detach the load circuit wire at the bottom of the circuit
c.
breaker.
d.
To remove the circuit breaker, pull at the top end thereby
disengaging the plug-in jaws from the bus bar.
Next, pull at the bottom, thereby disengaging the breaking
clip from the mounting cam.
e.
Install a new circuit breaker using the procedure of Step
d in reverse: clip onto mounting cam: then plug in jaws
onto the bus bar.
Connect the lead circuit wire to the circuit breaker.
f.
Reattach the switch box cover.
g.
Re-energize circuit by reconnecting to the external power
h.
source.
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