The Siemens 5SY5216-7CC12 is a 2-pole miniature circuit breaker (MCB) from the 5SY5 series, rated C16 with a 10 kA breaking capacity at 440 V DC. It is designed for DC branch-circuit protection in control panels, switchgear, and distribution boards where a compact, DIN-rail-mount breaker is specified.
The C16 trip curve means the breaker holds 1.13× to 1.45× rated current (18.1 A to 23.2 A) for over an hour, then trips magnetically between 5× and 10× In (80 A to 160 A). This suits motor-starting or moderate inrush loads where a B-curve would nuisance-trip but a D-curve would delay too long. The 2-pole configuration (2P) switches both the positive and negative conductors in a DC circuit, providing full isolation. This is standard for ungrounded DC systems or where double-pole disconnection is required by code.
Deployment Context
Snaps onto standard 35 mm DIN rail per EN 60715, fitting into a 36 mm-wide module (2 × 18 mm pole spacing). In a panel, account for the 10 kA SCCR when sizing the upstream bus and ensuring the enclosure short-circuit rating matches.