Moeller NZM12-1000 (ZM12) MCCB
Moeller NZM12-1000 (ZM12) MCCB
(OP)
Hi,
I have NZM12-1000 MCCB at site which I do not know much about. How to know the setting for overload time Tr is ON or OFF? This is a thermomagnetics type.
Thank you.
I have NZM12-1000 MCCB at site which I do not know much about. How to know the setting for overload time Tr is ON or OFF? This is a thermomagnetics type.
Thank you.





RE: Moeller NZM12-1000 (ZM12) MCCB
----------------------------------
If we learn from our mistakes,
I'm getting a great education!
RE: Moeller NZM12-1000 (ZM12) MCCB
If the full part number on the breaker has the letters "obi" near the end, that indicates that it is a Magnetic Trip Only breaker, there is NO thermal trip element. Its a Motor Circuit Protector intended to be used in a motor starter application where a thermal overlod is also present. You cannot use that as a general purpose circuit breaker.
If there is no "obi" in the part number, AND it ended in -CNA, it is a Thermal-Mag with an adjustable thermal trip, and the range of adjustment is shown elsewhere in the part number. There will also be a small round dial on the front below the handle shaft that shows a number range and scale. That is the adjustment for the thermal trip element.
If the number ended in -NA, it is a Thermal-Mag but the thermal trip setting is fixed, and the value is shown elsewhere in the part number. The small round dial for adjusting the trip element is still there, but it will be sealed or covered over by clear plastic or a paper sticker showing the setting, i.e. "1000A".
Hope that helps.
"Venditori de oleum-vipera non vigere excordis populi"