The Siemens SENTRON 3VA1120-6EF36-0CA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection, rated 20 A continuously at 40 °C and delivering a short-circuit breaking capacity of 220 kA at 240 V AC. It carries an undervoltage release (UVR) as the auxiliary release, so the breaker trips when control voltage drops — typical for emergency-stop or under-voltage lockout circuits in motor control centers.
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that fits Siemens SENTRON panelboards and most DIN-rail-mount enclosures with busbar systems. The 14.5 W maximum power loss at rated load matters for thermal budgeting inside sealed cabinets; allow natural convection or forced ventilation if multiple breakers are ganged.
Breaking capacity steps down with system voltage: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. The 800 V rated insulation voltage (Ui) means the breaker is rated for 690 V line-to-line applications with headroom. Current rating is flat 20 A from 40 °C to 55 °C, then derates to 19 A at 60 °C through 70 °C — no derating needed in most 40 °C panel environments.