Siemens 3VA1120-5EF32-0DA0 — SENTRON MCCB with Undervoltage Release
The Siemens 3VA1120-5EF32-0DA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection, rated at 20 A continuous across the 40 °C to 55 °C ambient range, derating to 19 A at 60 °C through 70 °C. This 3-pole unit carries a TM240 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR), meaning it trips on loss of control voltage — a common requirement for motor feeder disconnects and safety circuits where a drop in supply must open the breaker. Breaking capacity is 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V — figures that cover most industrial distribution panels up to 690 V line-to-line.
Panel Fit and Mounting
Dimensions are 130 mm high, 76.2 mm wide, and 70 mm deep — a standard SENTRON 3VA1 frame size that fits the same DIN-rail or screw-mount footprint as other breakers in the series. Rated insulation voltage is 800 V, with an operating temperature range of -25 °C to +70 °C and storage from -40 °C to +80 °C. Maximum power loss is 14.5 W — factor that into enclosure thermal calculations if the panel is densely packed.