The Siemens SENTRON 3VA1120-6ED32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 20 A at 40 °C, with a TM210 thermal-magnetic release and a line-protection design. It carries a 220 kA interrupting capacity at 240 VAC — that's the SCCR headroom you need for high-fault panels where a standard MCCB would cascade upstream. The 70 mm depth and 76.2 mm width fit the standard SENTRON mounting footprint, so it drops into an existing 3VA panel layout without re-drilling.
Interrupting ratings and selectivity
The interrupting capacity drops as voltage rises: 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V. At 240 V the 220 kA figure is the headline — that's enough to hold coordination on most 480 V delta or 240 V corner-grounded services without a current-limiting fuse ahead. The TM210 release is thermal-magnetic, so it handles overloads thermally and short-circuits magnetically; no electronic trip unit to program, no auxiliary power needed.
Thermal derating and operating range
Rated 20 A continuously from 40 °C through 55 °C; at 60 °C and 65 °C it derates to 19 A, and holds 19 A at 70 °C. That's a shallow derating curve — useful if the breaker sits in a warm enclosure near other heat sources. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 12 W.