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What does factory modification DFM1 represent on the Class 8910 Type DPA contactors?

Addition of a Class M, 30 amp, 600-volt ac 3-pole fuse block mounted on top of the definite purpose contactor. This block will accept 1-3/32 x 1-1/2 inch cartridge type fuses and is available on Class 8910 Type DPA13, DPA23, DPA33 or DPA43 contactors only.

CTA-ID : 2027450
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