TM 9-4120-402-14
4-43. CIRCUIT BREAKER (CB1). - continued
a. Remove.
(1) Remove six screws (1) and protective cover (2) from circuit breaker (3) and rear panel (4).
(2) Tag and disconnect wire leads from circuit breaker (3).
b. Inspect.
Check general condition of circuit breaker and that terminals are not broken, loose, or missing. Replace if
damaged.
c. Test.
(1) With circuit breaker in ON position, check continuity across terminals LINE and LOAD of each pole. The
multimeter must show that contacts are closed (continuity).
(2) With circuit breaker in OFF position, check continuity across terminals LINE and LOAD of each pole. The
multimeter must show that contacts are open (no continuity).
(3) Replace circuit breaker if it tests defective.
d. Install.
(1) Attach circuit breaker (3) and protective cover (2) onto rear panel (4) using six screws (1).
(2) Using tags and wiring diagram figure 4-10 connect wire leads to circuit breaker (3). Remove tags.
NOTE
FOLLOW-ON MAINTENANCE:
Attach rear panel (para 4-22).
Connect power at power source.
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