What the ratings mean for fit
The Siemens 3VA1132-4GE42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 32 A continuous current across a 4-pole configuration, sized for line-protection duty in distribution panels. The TM220 thermal-magnetic release means the thermal element handles overloads and the magnetic element handles short-circuits — no electronic adjustment, so it's a fixed-trip breaker suited to standard feeder or branch circuits where coordination curves are known at design time. Breaking capacity is the headline selector: 121 kA at 240 V AC, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 121 kA figure at 240 V tells you this breaker handles high available fault current on the secondary side of a large transformer — typical for a main or tie position in a 240/120 V panelboard. At 690 V the 11.9 kA rating still covers most motor-control-center fault levels, but verify the available short-circuit current at that voltage before committing the BOM line. Temperature derating is minimal up to 50 °C — still full 32 A — then drops to 31 A at 55–60 °C and 30 A at 65–70 °C. That means in a tightly packed enclosure with ambient near 60 °C you lose 1 A per pole; plan the load schedule accordingly. The rated insulation voltage of 800 V gives headroom for 690 V systems. Physical fit: 70 mm deep × 101.6 mm wide × 130 mm high. The 4-pole width (101.6 mm) is the standard 4-module MCCB footprint for this class — it occupies four 25.4 mm positions on a DIN rail or panel-mount plate. IP40 on the front means finger-safe from the front face but not sealed against dust ingress into the enclosure interior.
Lifecycle and sourcing reality
Maximum power loss is 10.6 W — relevant for enclosure thermal calculations if you're stacking multiple breakers in a sealed panel. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C, so it can sit in an unheated warehouse or a cold plant without issue.
Where it fits in a panel
The 3VA1132-4GE42-0AA0 mounts on a DIN rail or directly to a mounting plate via the standard 4-pole MCCB footprint. The TM220 release has no communication function, no undervoltage release, and no ground-fault monitoring — it's a plain-vanilla thermal-magnetic breaker for line protection. If your design requires a shunt trip, UVR, or ground-fault module, you need the accessory slot version (check the 3VA accessory catalog).