ABB SU203M-K20 Industrial Safety Control Module

ABB SU203M-K20 is a three-pole System pro M compact miniature circuit breaker (MCB) rated 20 A with a 10 kA short-circuit breaking capacity, designed to protect three‑phase distribution circuits in UL 489‑compliant systems. The device is specified for 480Y/277 V AC three‑phase applications, making it suitable for distribution boards in industrial or commercial settings that rely on 277 V line‑to‑neutral power. As part of ABB’s System pro M compact family, the SU203M‑K20 uses a K‑characteristic trip curve to provide precise overcurrent protection and enable selective coordination with upstream devices. The unit is intended for DIN rail mounting in ABB switchgear and compatible third‑party panels that support System pro M compact modules. The official ABB product page lists this model with the order code 2CDS273337R0487, confirming its 3P configuration and UL 489 compatibility. This model is well suited for protecting branch circuits in 3‑phase power networks, delivering clear, predictable tripping behavior essential for reliable industrial electrical protection.