Siemens 5SY3132-6 SENTRON MCB — 32 A, B-Curve, 1-Pole
It breaks fault currents up to 4.5 kA per EN 60898 and 6 kA per IEC 60947-2, with a DC rating of 15 kA per IEC 60947-2 and 5 kA per UL 1077 / CSA C22.2 No. 235. IP20 with connected conductors.
The DC rating of 15 kA at 72 V DC makes it usable in DC sub-distribution for control circuits or small UPS outputs. The UL 1077 / CSA C22.2 No. 235 rating of 5 kA supports North American panel builds where supplementary protection is required. Energy limiting class 3 means it restricts let-through energy enough to protect downstream wiring and connected equipment during a fault.
The 18 mm width (1 width unit) and 70 mm installation depth leave room for adjacent breakers and wiring. Any mounting position is allowed, which helps in tight enclosures. Humidity influence is specified: max 95% RH at 55 °C, derating to 55% at 70 °C and 35% at 75 °C — relevant for outdoor or washdown-adjacent panels where condensation is a concern. Touch protection is integrated on the terminals.
Approvals include EN 60898, IEC 60947-2, UL 1077, and CSA C22.2 No. 235. The designation per DIN EN 61346-2 and DIN EN 81346-2 is F (protective device).