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What is 1287 suffix on a breaker?

Suffix 1287 is an auxiliary switch 2A2B on the right pole with gold flashed contacts, undervoltage release left pole 48 VDC, special leads - 48 inch, all devices, special lugs - CW and special marking - customer part number to appear on faceplate and on carton label.

CTA-ID : 2025775
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