What this 3VA1150-6EF36-0DA0 is and what it does
The Siemens 3VA1150-6EF36-0DA0 is a SENTRON molded case circuit breaker (MCCB) for line protection, rated 50 A continuous current with a TM240 thermal-magnetic overcurrent release. It's a 3-pole unit with an undervoltage release (UVR) fitted, no auxiliary contacts, and no communication module — a straightforward power distribution breaker for panels where you need remote trip capability via undervoltage but don't need status feedback or network integration.
Breaking capacity — what the numbers mean for your panel
This breaker delivers 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V. Those are the maximum fault currents it can safely interrupt at each voltage level — critical for SCCR compliance on the line side of a panel. At 240 V it handles virtually any utility fault; at 415 V it still clears 154 kA, which covers most industrial secondary substations. The 17 kA at 690 V is the limit for 690 V distribution, so if your system runs at that voltage, verify the available fault current stays under that ceiling.
Thermal derating — when the 50 A rating holds and when it doesn't
The 50 A rated continuous current (Iu) holds from 40 °C up to 50 °C ambient. At 55 °C it derates to 48 A, at 60 °C to 47 A, at 65 °C to 46 A, and at 70 °C to 45 A. If your panel ambient runs hot — say, a non-ventilated enclosure near a furnace line — size the load at the derated figure, not the nameplate 50 A. The operating temperature range is -25 °C to 70 °C, and storage range is -40 °C to 80 °C.
Physical fit and panel integration
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. That's a standard 3-pole MCCB footprint — it fits the same cutout and bus-bar spacing as other SENTRON 3VA frames. Front protection is IP40, so it's fine inside a closed panel but not for washdown environments. The undervoltage release (UVR) is the 3VA9608-0BB25 auxiliary trip; if you're replacing an older unit, confirm the UVR coil voltage matches your control circuit.