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DC wiring and voltage levels for standard three pole MCCB ?

The breaker must be connected as per below wiring diagram, and the voltage is limited to that stated. A 3-pole breaker rated 125/250VDC with at least two poles wired in series does not qualify for any higher voltage rating if the third pole of the breaker is also wired in series. so use of third pole of standard MCCB is not acceptable for DC application. We have separate offering for the DC-rated specialty breakers, which are specifically tested for higher DC voltages.

 

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