SENTRON 3VA1150-6EF36-0AC0 — 50 A MCCB for Line Protection
The Siemens 3VA1150-6EF36-0AC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection, carrying a 50 A continuous rating at 40 °C ambient across its 3-pole frame. The TM240 thermal-magnetic release provides overload and short-circuit protection for feeder and distribution circuits in industrial panels and building power distribution. Rated interrupting capacity reaches 220 kA at 240 V AC and 154 kA at 415 V AC, dropping to 17 kA at 500 V and 690 V — the SCCR headroom at lower voltages makes this breaker suitable for high-fault-capacity main or subfeed positions where coordination with upstream gear is critical. The 70 mm depth by 76.2 mm width footprint fits standard 3-pole MCCB panel cutouts and DIN-rail adapter plates; the 130 mm height clears typical enclosure gland plates without interference.
Thermal Derating and Ambient Performance
The 50 A rating holds flat from 40 °C through 50 °C ambient. At 55 °C it derates to 49 A, at 60 °C to 48 A, at 65 °C to 46 A, and at 70 °C to 45 A. For a panel running warm — say 55 °C internal ambient — the breaker still carries 49 A continuous, which is within typical design margins for a 50 A feeder. Operating temperature range spans -25 °C to 70 °C; storage range extends from -40 °C to 80 °C. The insulation voltage is rated 800 V, giving headroom for 480/277 V or 600 V systems.
Configuration and Auxiliary Switching
This variant ships with a TM240 thermal-magnetic release and carries two built-in auxiliary switches (HQ type) for status feedback to a PLC or indication lamp. No undervoltage release, no ground-fault monitoring, and no communication module are fitted on this order code — it is a straight line-protection breaker with basic auxiliary contacts. The supplied basic switch is order code 3VA11506EF360AA0 — the internal switching mechanism that the auxiliary switches monitor. Maximum power loss at rated current is 14.6 W, which should be factored into enclosure thermal calculations if multiple breakers are ganged.