What this MCCB delivers for a panel build
The Siemens SENTRON 3VA1132-5EF32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for 32 A continuous current across the 40 °C to 50 °C ambient range, with only a 2 A derating at 70 °C. That means it holds its full rating in a warm enclosure — a real advantage when the panel is packed tight and airflow is limited. Its interrupting capacity is substantial: 187 kA at 240 V, 121 kA at 415 V, and 75.6 kA at 440 V. For a 32 A frame, that's high-fault headroom — useful downstream of a large transformer or on a stiff industrial service where available fault current is high. The 800 V rated insulation voltage confirms it's built for 690 V line-to-line systems. Designed for line protection, this MCCB sits on a DIN rail — 70 mm deep, 76.2 mm wide, 130 mm tall — so it slots into a standard panel layout without surprises. The factory-fit auxiliary switch pack includes 2 auxiliary switches plus a trip alarm switch (HQ), and an undervoltage release (UVR) is already installed. That saves field wiring time if your safety circuit demands a UVR.
Integration notes for the wireman
Mounts on standard 35 mm DIN rail. The 70 mm depth leaves clearance behind a 200 mm deep enclosure; the 76.2 mm width means three of these fit in a 230 mm wide backplate section. Power loss at full load is 13.1 W — negligible for thermal budgeting in a ventilated panel, but worth noting if the cabinet is sealed and densely packed. The UVR trips the breaker when control voltage drops — typical for emergency-stop or undervoltage protection schemes. The auxiliary switch complement (2 NO/NC + trip alarm) gives you status feedback to a PLC or indicator lamp without adding external relays.