Allen-Bradley 1492-SPM3C500 Supplementary Protector is a 3‑pole MCB-style device rated for 50 A, designed as a supplementary circuit protector with Trip Curve C and no neutral. Used to provide secondary protection for equipment where branch-circuit protection is already in place, it is suitable for inclusion in control panels and various machinery applications. This model is part of the 1492-SPM family from Rockwell Automation (Allen‑Bradley), identified by Bulletin 1492-SPM as a 50 A, 3‑pole supplementary protector.
