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MEP003A opening main breaker at <75% load

delvin00

New member
5
0
0
Location
Columbus, NC
I need some guidance. My otherwise great MEP003A throws the main CB at 75% load as indicated by panel guage and my tester. I replaced the main breaker with a supposedly good one. Unfortunately it still does it. Where should I look next? Any help will be greatly appreciated.:roll:
 

Munchies

Member
417
3
18
Location
Keesler Air force base/ MS
Could be a faulty Current transformer but thats a guess. double check your TM for this fault condition for some more clues. If that doesnt get you anywhere, read the mep-003a main breaker thread. Lots of info and measurements in there.
Lastly. Consider an oversized contactor to replace the breaker. They are quite troublesome.
 

LuckyDog

Member
394
11
18
Location
Freedom, NH
You may want to check the adjustment of R3.IIRC If R3 is not adjusted correctly, it will cause the circuit breaker to trip at the wrong levels. Section 9 in TM TM 5-6115-585-34
 

Isaac-1

Well-known member
1,970
50
48
Location
SW, Louisiana
Also what is the history on this unit, could someone have swapped out the box with the CT in it from a MEP-002a and not reset it for a MEP-003a? just a thought as that trip point would be about right for a MEP-002a. Again the first thing I would check is that R3 is adjusted correctly since this breaker does not trip like a conventional breaker, instead it relies on shunt tripping from the CT circuit.

Ike
 
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