The Siemens 3VA1150-5EF46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 50 A continuous current, 4-pole, with a TM240 thermal-magnetic overcurrent release. It's designed for line protection in distribution panels and switchboards — the TM240 release gives you a fixed thermal pickup and magnetic trip tailored for feeder or main breaker duty.
Breaking capacity and selectivity
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. Those numbers tell you where it can sit in a fault-current hierarchy — at 240 V it handles very high available fault current, so it's a candidate for main or tie breakers in low-voltage switchgear. At 690 V the 17 kA rating is more typical for downstream feeders; plan your coordination study accordingly.
Thermal derating and power loss
The 50 A rating holds flat from 40 °C to 50 °C, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. Maximum power loss is 14.6 W — useful for enclosure heat calculations. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
Physical fit and panel integration
Dimensions are 130 mm high, 101.6 mm wide, 70 mm deep. It's a standard SENTRON 4-pole MCCB footprint — mounts on a DIN rail or directly to a backplate via the screw terminals. No undervoltage release, no ground-fault monitoring, no communication function on this variant; it's a straight thermal-magnetic breaker for basic line protection.