Siemens SENTRON 3VA1120-3EF32-0DC0 — 20 A MCCB with UVR and 2 Aux Switches
The Siemens SENTRON 3VA1120-3EF32-0DC0 is a 3-pole molded case circuit breaker rated for a continuous current of 20 A at 40 °C, with a TM240 thermal-magnetic overcurrent release. Its breaking capacity reaches 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V — covering most industrial distribution panels up to 690 V line voltage.
Breaking Capacity and Selectivity — What the Ratings Mean
At 415 V the rating drops to 52.5 kA, and at 690 V to 10.5 kA — this is typical for a 20 A frame; it means the breaker can be used in high-fault-capacity 240 V panels (e.g., near a large transformer) but needs upstream coordination at higher voltages. The TM240 release provides thermal protection for overloads and magnetic trip for short circuits, with the magnetic threshold fixed at 240 A (12x In).
Integration — Panel Fit and Wiring
The 3VA1120-3EF32-0DC0 drops into a standard SENTRON MCCB cutout. The two HQ auxiliary switches (form C) can be wired to a PLC digital input for remote status; the undervoltage release (UVR) requires a separate 24 V DC or AC supply (coil voltage not listed here — verify against the panel control voltage). The TM240 release is non-interchangeable, so the breaker is factory-set for 20 A continuous.