Siemens 5SX21C16 is a single‑pole miniature circuit breaker (C16) rated for 16 A at 230/400 V AC, and it belongs to the Siemens 5SX family used for control‑circuit protection. This control‑circuit breaker provides overcurrent protection for small control circuits in electrical panels and automation gear, featuring a Type C tripping characteristic suitable for moderate inrush loads. The model number 5SX21C16 is widely listed as 5SX21‑C16 by retailers, confirming its 1‑pole, 16‑amp, 230/400 V AC specification.
