The Siemens SENTRON 3VA1120-3EF36-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries a continuous current of 20 A across its full ambient range up to 55 °C, derating to 19 A at 70 °C. That means it holds its full rating in a warm panel — no early derate headache.
Breaking capacity by voltage level
Breaking capacity climbs with system voltage: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That 75.6 kA at 240 V gives headroom for high-fault panels on 240 V delta or 277/480 V wye services where the line-to-ground fault current is the limiting factor.
Integrated releases and auxiliary switches
Factory-fitted with an undervoltage release (UVR) and a 2-auxiliary-switch plus 1-trip-alarm-switch arrangement. That UVR means the breaker drops out on a voltage dip — useful for motor branch circuits where you want automatic disconnect on loss of control power. The auxiliary switch set gives status feedback for PLC or SCADA monitoring without adding a separate module.
Physical fit and panel integration
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. That 70 mm depth is the same as the standard 3VA1 frame — it sits flush in a panel with the same mounting footprint as other 3VA1 breakers. Rated insulation voltage 800 V, power loss 14.5 W maximum at rated load. The 3-pole block fits a standard DIN-rail or screw-mount backplate.