Rating and fit for line protection
The Siemens SENTRON 3VA1120-6EF32-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 20 A continuously at 40 °C ambient — a rating that holds steady through 55 °C before derating to 19 A at 60 °C. Its interrupting capacity reaches 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V, with a floor of 17 kA at 500 V and 690 V. That 220 kA figure at 240 V means it safely clears high-fault currents in low-voltage distribution without cascading upstream — a critical parameter for panel coordination studies. The rated insulation voltage of 800 V gives headroom for 480 V and 600 V class systems.
Integrated auxiliaries and release options
This MCCB ships with a factory-fitted shunt trip (STL) release and a complement of 2 auxiliary switches plus 1 trip alarm switch HQ. The shunt trip allows remote tripping via a control voltage — useful for emergency-stop circuits or supervisory shutdown sequences. The auxiliary switch set provides status feedback for PLC or SCADA monitoring. There is no undervoltage release fitted, no ground-fault monitoring module, and no communication function onboard — this is a straightforward line-protection device with wired auxiliaries, not a networked power breaker.
Panel fit and thermal management
Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth — a compact 3-pole MCCB footprint that fits standard panel mounting. Maximum power loss is 12 W, which should be factored into enclosure thermal calculations, especially when multiple breakers are ganged. Operating temperature range is -25 °C to 70 °C; storage range extends from -40 °C to 80 °C. The trip indicator provides local visual status for troubleshooting without opening the panel door.
Lifecycle and compliance posture
The lifecycle stage is recorded as current production. This is an active Siemens SENTRON 3VA series part, not subject to phase-out notices at this time. For compliance documentation — RoHS, REACH, UL, IEC — the SENTRON family carries full declarations of conformity; the specific certificates are available on request as part of the supplier-quality package. This part is quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.