ABB ST203M-Z32 Industrial Safety Relay Module

ABB ST203M-Z32 is a three‑pole miniature circuit breaker (MCB) with a 32 A nominal rating and a Z‑curve tripping characteristic, designed for reliable overcurrent protection in industrial electrical panels and distribution boards. It provides a high breaking capacity of 10 kA (Icn 10 kA) and is listed under UL 489, making it suitable for use in three‑phase AC circuits across typical industrial installations. The ST203M‑Z32 is cataloged in ABB’s lineup as S203M‑Z32 and is three module‑width wide, matching ABB’s modular protection devices for compact panel layouts. Common applications include protecting motors, control circuits, lighting, and other general loads in industrial environments where a compact, UL489‑listed 32 A MCB with a Z‑curve is required. This model reflects ABB’s S200/S203M family approach to dependable, predictable short‑circuit protection in industrial utilities and automation panels.