The Siemens SENTRON 3VA1120-3ED16-0AA0 is a 1-pole molded case circuit breaker (MCCB) with a TM210 thermal-magnetic trip unit, rated 20 A at 40 °C ambient. It delivers 52.5 kA interrupting capacity at 240 V AC and 7.5 kA at 415 V AC, sized for line protection in distribution panels.
The 20 A rating holds flat from 40 °C through 55 °C, then derates to 19 A at 60 °C and above — no headroom loss in a warm enclosure until you cross 55 °C. The 52.5 kA interrupting at 240 V AC covers most North American service-entrance fault levels; at 415 V AC the 7.5 kA rating suits European industrial distribution where the transformer impedance limits the prospective fault current. The TM210 trip unit is thermal-magnetic — thermal for overload, magnetic for short-circuit.
Integration
The 25.4 mm width (1 inch) fits a standard 1-pole MCCB slot in a Siemens SENTRON panelboard or distribution board. Depth of 70 mm and height of 130 mm match the 3VA frame footprint.