What this MCCB is and what it does
The Siemens SENTRON 3VA1132-3EF36-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated for 32 A continuous current (Iu) with a TM240 thermal-magnetic overcurrent release. It's a line-protection device — meaning it sits between the transformer or main bus and a distribution panel, not on a motor branch. The interrupting ratings climb to 75.6 kA at 240 V and 52.5 kA at 415 V, so it handles high-fault scenarios typical of industrial switchgear without needing an upstream current-limiting fuse. The TM240 release is a fixed thermal-magnetic type — no interchangeable trip units. That means the 32 A rating is baked in; if the load changes, you swap the breaker, not the trip. The breaker includes an undervoltage release (UVR) as standard, so it can be wired into a safety circuit that drops the main on loss of control voltage. No auxiliary contacts, no communication module, no ground-fault monitoring — this is a clean, dumb breaker for a straightforward line-protection role.
Interrupting capacity — what those numbers mean for your panel
The 75.6 kA at 240 V is the highest interrupting rating on this breaker, and it's the one that matters for 240 V delta or split-phase systems. At 415 V (common in European 400 V grids) it still holds 52.5 kA, which covers most industrial service-entrance faults. At 440 V it drops to 32 kA, and at 690 V it's 10.5 kA — still usable for 690 V drives or mining gear, but you need to verify the available fault current at the point of installation. The 800 V rated insulation voltage (Ui) means the breaker's internal clearances are designed for 800 V systems, so it's safe on 690 V networks.
Thermal derating — don't let the panel oven fool you
The 32 A rating holds flat from 40 °C to 50 °C ambient. At 55 °C it derates to 30.72 A, at 60 °C to 30.08 A, at 65 °C to 29.44 A, and at 70 °C to 28.8 A. If the breaker lives in a crowded enclosure with other heat sources, use the 50 °C column for sizing — that's the typical sealed-panel ambient. The operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C. The IP40 front protection means it's splash-proof from the front but not sealed; mount it inside a cabinet, not outdoors.
Physical fit and panel integration
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep. That's a standard 3-pole MCCB footprint — it fits the same DIN-rail or screw-mount cutout as other SENTRON 3VA frame sizes. The 70 mm depth is shallow enough for a 200 mm deep enclosure with room for wiring behind. No auxiliary contact slot on this variant, so if you need a status signal back to the PLC, you'll need the separate auxiliary trip module (order code 3VA9608-0BB25) or a contactor downstream.