What this MCCB is and what it does
The Siemens 3VA1032-2ED36-0CH0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection — the standard job of clearing overloads and short circuits in a distribution panel. It's a 3-pole unit, rated 32 A continuous at 40 °C, with an interrupting capacity that climbs to 52.5 kA at 240 V and still holds 7.5 kA at 690 V. That spread tells you it's sized for industrial feeders where fault current varies by voltage level, not just a light commercial panel. The built-in undervoltage release (UVR) drops the breaker if control voltage falls below the dropout threshold — a common requirement for safety disconnects on machine tools or conveyors where loss of control power should kill the load. The auxiliary switch complement (2 aux + 1 trip alarm HQ) gives the PLC or BMS a status feedback path without adding a separate accessory.
Thermal derating and real-world current
The breaker holds its full 32 A rating up to 50 °C ambient. Above that it derates in 1 A steps: 31 A at 55 °C and 60 °C, then 30 A at 65 °C and 70 °C. If your panel runs hot — say a sealed enclosure near a furnace line — you need to account for that 2 A drop at the top end. The rated insulation voltage is 800 V, so the internal clearances are built for 690 V systems with margin.
Mounting and panel fit
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard MCCB footprint that fits most DIN-rail or screw-mounted panel layouts. The 70 mm depth is shallow enough for a 200 mm deep enclosure with room for wiring gutters. No communication module on this variant; it's a straight electromechanical breaker with a trip indicator and the UVR wired separately.