SENTRON 3VA1120-6EF36-0BA0 — 20 A MCCB with 220 kA Breaking Capacity
The Siemens 3VA1120-6EF36-0BA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, carrying 20 A continuously across the 40 °C to 55 °C band and derating only to 19 A at 70 °C — so it holds its full rating in most ventilated enclosures without a derate calculation. Breaking capacity sits at 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V — high enough for most transformer-fed or generator-backed fault-current scenarios downstream of a large service entrance. Three-pole construction with a TM240 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR) that trips the breaker when control voltage drops — common on safety-disconnect circuits where loss of pilot power must open the load.
Panel Fit and Mounting
Width of 76.2 mm (3 in) and depth of 70 mm (2.76 in) — fits standard 3-pole MCCB panel cutouts and bus-bar centers. Height is 130 mm (5.12 in). No communication module, so no extra depth for a comms piggyback. Rated insulation voltage 800 V. Power loss at full load is 14.5 W.
Environmental and Compliance
Operates from -25 °C to 70 °C ambient; stores from -40 °C to 80 °C. No ground-fault monitoring version on this variant — it's a straight line-protection MCCB. No trip indicator or voltage trigger on this unit. The supplied basic switch is order code 3VA11206EF360AA0.