ABB S503-C16 Molded Case Circuit Breaker 3-Phase

ABB S503-C16 is a three-pole molded case circuit breaker designed to protect 3-phase distribution circuits in industrial and commercial panels. It is rated 16 A and uses a thermal-magnetic trip mechanism with a C-type characteristic to respond to overloads and short circuits. The device delivers an interrupt rating of up to 30 kA, enabling effective fault clearance on systems with substantial fault currents. This MCCB supports voltages up to 277/Y600 VAC (UL 1077) and up to 690 VAC (IEC), making it suitable for a wide range of global installations. The S503-C16 is designed for DIN rail mounting and is part of ABB’s S500 series of molded case breakers, offering compact protection inside standard enclosures while maintaining reliable trip performance for 3-phase loads in industrial control panels.