Eaton WMS3B60 DIN-rail Mounted Protective Device

The Eaton WMS3B60 is a 3‑pole, 60 A DIN‑rail mounted supplementary protector (miniature circuit breaker) that provides overcurrent and short‑circuit protection for low‑power control circuits in industrial panels. This UL 1077‑recognized device mounts on a 35 mm DIN rail and protects control transformers, relays, PLC I/O, and auxiliary circuits up to 480–600 V AC (application dependent) with a B‑curve trip characteristic (3–5× In magnetic range). It is designed for control panels, automation cabinets, and industrial electrical distributions where resettable protection complements main branch protection, delivering thermal‑magnetic operation for fault fault conditions. Common applications include PLC systems, control power transformers, relay circuits, lighting control panels, and other automation equipment where reliable supplementary protection is required. The part number is WMS3B60 from Eaton (Cutler‑Hammer), aligning with the WMS UL 1077 series, with common replacements in the same form factor including Eaton WMS3C60, Schneider Electric Acti9 iC60N 3P 60A, and Siemens 5SY63 3‑pole 60A DIN rail breakers.