ABB S201P-Z4 Miniature Circuit Breaker 1 Pole 277VAC

ABB S201P-Z4 Miniature Circuit Breaker is a 1-pole, DIN-rail mounted protection device rated for 277 VAC with a 4 A rating, part of ABB System pro M compact S200P family. It uses a Z-curve tripping characteristic for inverse-time overload protection, making it well suited for lighting and small branch circuits in commercial and industrial panels. The unit features screw terminals for secure connections and mounts on a TH35 DIN rail for quick installation. Key specifications include a short-circuit current rating (Icu) up to 25 kA and a service short-circuit rating (Ics) up to 12.5 kA at 480Y/277 VAC, with a maximum operating voltage of 480Y/277 VAC and a rated voltage commonly used up to 277 VAC. The device weighs approximately 0.14 kg and offers IP20 protection (IP40 when installed in an enclosure), with electrical and mechanical endurance of about 20,000 cycles. Product identification is 2CDS281001R0338. This ABB 1P Z-characteristic MCB is listed for UL 1077 and CSA compatibility, making it suitable as supplementary protection in control panels, distribution boards, and other DIN-rail installations where 277 VAC circuits require reliable, per-spec protection.