The Siemens 5SY3025-6 is a SENTRON miniature circuit breaker (MCB) rated 25 A with a B tripping characteristic, designed for 230 V AC single-phase circuits. It breaks fault currents up to 4.5 kA per EN 60898, which covers the majority of residential and light commercial distribution boards — the standard interrupting rating for downstream sub-distribution.
The 90 mm height and 76 mm depth (70 mm installation depth) fit standard consumer units and small distribution boards — no extra clearance needed behind the rail. Mounting position is unrestricted, which helps when the panel layout is tight.
Screw terminals accept 0.75 to 16 mm² solid or stranded copper. Tightening torque is 2 to 2.5 N·m (17.7 to 22.1 lbf·in) — standard for this class.
Rated for ambient temperatures from -25 °C to +45 °C during operation and -40 °C to +75 °C in storage. Halogen-free and silicon-free construction. Energy limiting class 3, overvoltage category III.