Siemens SENTRON 3VA4120-4ED34-1AA0 — 20 A MCCB, 3-Pole, 65 kA at 240 V
The Siemens SENTRON 3VA4120-4ED34-1AA0 is a 3-pole molded-case circuit breaker (MCCB) rated for a continuous current of 20 A at 40 °C, with a thermal-magnetic TM210 release that is fixed at 300 A instantaneous trip (li min. and max. both 300 A).
At 240 V it clears 65 kA — that is the high-fault rating that makes this breaker suitable for main or large-feeder positions in a 240 VAC panelboard. At 480 V the rating drops to 25 kA, and at 600 Y/347 V it is 14 kA, so the application voltage directly governs where this MCCB can be placed without exceeding its interrupting capacity.
Rated 20 A from 40 °C through 55 °C; at 60 °C and 65 °C it holds 19 A, and at 70 °C it derates to 18 A. The TM210 release is thermal-magnetic — no electronic adjustment — so the fixed li setting at 300 A means the magnetic trip is not field-adjustable. Dimensions are 76.2 mm wide (3 in), 129.4 mm tall, 75.1 mm deep, fitting a standard 3-pole MCCB footprint on DIN rail or panel-mount.