The Siemens 5SY5216-6CC12 is a 2-pole miniature circuit breaker from the 5SY5 series, rated B16 curve with a 440V DC breaking capacity of 10kA.
For BOM planning, the current lifecycle stage means no immediate migration risk.
The 440V DC rating is the key differentiator: this MCB is designed for DC-side protection in photovoltaic arrays, battery banks, or DC bus distribution — not for standard AC branch circuits. The 2-pole (2P) configuration breaks both the positive and negative conductors simultaneously, required for ungrounded DC systems per IEC 60947-2. The B16 curve provides fast magnetic trip for short circuits while allowing moderate inrush from capacitive loads.
Integration notes
Snap-on mounting to standard DIN rail (EN 60715). The 2-pole width occupies two modular units (36 mm). Terminals accept 0.5–25 mm² conductors; torque to 2.5 Nm. No derating required for ambient temperatures up to 40°C per the manufacturer's data.