The Siemens SENTRON 3VA1120-5EF36-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 20 A continuous at 40 °C through 55 °C, with a TM240 thermal-magnetic release designed for line protection. It carries an interrupting capacity of 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 440 V — figures that cover most industrial distribution panels without needing a current-limiting upstream device.
Interrupting capacity and thermal performance
The 187 kA at 240 V is the headline number, but the 121 kA at 415 V is the one that matters for most European 400 V panels — it means this breaker can sit at the main distribution point without a series fuse. Thermal derating is minimal: the breaker holds 20 A from 40 °C to 55 °C, then drops only 1 A at 60 °C and 65 °C, and 19 A at 70 °C. That flat curve means you don't have to oversize the frame for a warm enclosure — it's already accounted for in the design.
Built-in undervoltage release
No separate UVR module to buy and wire.
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a 3-pole MCCB that fits standard 3-pole panel space. No special adapter plate needed for a standard DIN-rail mount.