ABB S201UDC-K4 Industrial Safety Relay System

ABB S201UDC-K4 is a 1-pole DC miniature circuit breaker (MCB) with a K-characteristic designed to protect DC circuits in industrial control panels and DC power systems. It is rated for 4 A and 60 V DC, making it suitable for low-voltage DC protection in automation, small power supplies, and DC control circuits. The device carries the catalog number 2CDS271517R0337 as part of ABB’s System Pro M Compact/ABB Control lineup, with S201UDC-K4 listed as the alternate catalog reference. It offers a 14 kA short-circuit breaking capacity, providing robust protection against higher fault currents in DC applications. The S201UDC-K4 unit weighs about 0.15 kg, reflecting its compact DIN-rail-ready design suitable for space-constrained panels. ABB describes this product as a DC MCB intended for reliable protection in DC applications, aligning with its use in industrial control and automation environments. The S201UDC-K4 is part of ABB’s System Pro M Compact family within ABB Control, a lineup of protective devices designed for modular, DIN-rail installations. Note: DC-only variants of this product family are associated with UL 489 in documentation that references polarity considerations for DC applications.