Siemens AG 5SX21 C10 Miniature Circuit Breaker

Siemens 5SX21 C10 is a 1-pole miniature circuit breaker (MCB) rated for 230/400 VAC with a 10 A current rating and a Type C (C-curve) profile for general-purpose overload protection. It is designed for DIN-rail mounting in low-voltage distribution panels and uses screw-type output terminals for secure conductor connections. This unit ships with attached accessory 5SX91 (Siemens part #284509), aligning with Siemens’ 5SX family for modular panel installations. Common applications include protecting single-phase circuits in residential, commercial, and light industrial electrical distributions where reliable overcurrent protection is required.