SENTRON 3VA1120-3GE42-0AA0 — 20 A MCCB, 4-Pole, TM220
The Siemens 3VA1120-3GE42-0AA0 is a SENTRON-series molded case circuit breaker (MCCB) rated for 20 A continuous current across the full 40–55 °C ambient range, with only a 1 A derating step at 60–70 °C. Its 4-pole configuration and TM220 thermal-magnetic release make it a direct fit for line-protection duty in distribution panels.
Interrupting Capacity & Voltage Ratings
This MCCB delivers 75.6 kA interrupting capacity at 240 VAC, 52.5 kA at 415 VAC, 32 kA at 440 VAC, and 11.9 kA at 500 V and 690 VAC. Those numbers tell the panel designer where the part can clear a fault without upstream coordination — at 240 V it handles high available fault current typical of service-entrance positions; at 415 V and above it fits downstream distribution where fault levels are lower.
Panel Fit & Integration
Front face carries IP40 protection — suitable for enclosed panel mounting where no washdown or dust ingress is expected. Dimensions are 70 mm depth, 101.6 mm width, 130 mm height; the 4-pole width (101.6 mm) matches standard MCCB panel cutouts for this class. Maximum power loss is 12 W, worth factoring into enclosure thermal calculations.