What the interrupting ratings mean for panel coordination
The Siemens SENTRON 3VA1132-4EF32-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 32 A continuous current (Iu) at 40 °C through 50 °C ambient, with a slight thermal derating curve above that — 30.72 A at 55 °C, 30.08 A at 60 °C, 29.44 A at 65 °C, and 28.8 A at 70 °C. The interrupting capacity is the headline: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. For a panel designer, the 121 kA at 240 V means this breaker can be placed at the main service entrance on a high-fault utility feed without needing upstream current-limiting fuses — it clears a bolted fault at that level in its own arc chamber. The 75.6 kA at 415 V covers most European industrial distribution boards. The 690 V figure (11.9 kA) is lower but still adequate for motor control centers where the transformer impedance limits available fault current to well under that.
TM240 release and auxiliary configuration
The overcurrent release is the TM240 thermal-magnetic type — fixed thermal pickup at 32 A, magnetic short-circuit trip set at the factory. This is a line-protection MCCB, not a motor-protection breaker; the TM240 curve is optimized for cable and busbar protection, not for motor inrush. The auxiliary contact block is factory-fitted as 2 auxiliary switches plus 1 trip alarm switch (HQ type), and the integrated undervoltage release (UVR) is wired to the coil terminals. The UVR part number for the auxiliary trip is 3VA9608-0BB24. No ground-fault monitoring, no communication module, no voltage-trip function — this is a straightforward thermal-magnetic breaker for fixed-distribution panels.
Panel integration and mounting dimensions
The breaker measures 76.2 mm wide, 130 mm high, and 70 mm deep. It mounts on a DIN rail or directly to a backplate via screw terminals. The IP40 rating on the front means it is protected against solid objects larger than 1 mm (tools, wires) but not against water ingress — suitable for indoor panel installation, not washdown environments. The 3-pole design with the factory-fitted auxiliary contacts and UVR occupies a fixed footprint; no additional modules are needed for the basic trip and alarm functions. The rated insulation voltage (Ui) is 800 V, which covers 690 V systems with margin.