What the ratings mean for fit
The 3VA1150-6EF32-0DC0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection, rated 50 A continuously at 40 °C ambient — that is the thermal current you size the feeder for. At 240 V it interrupts 220 kA, dropping to 17 kA at 690 V; the breaking capacity at your system voltage determines whether this breaker clears a fault without cascading upstream. The 70 mm depth and 76.2 mm width fit standard MCCB panel cutouts, and the 130 mm height leaves room for the undervoltage release (UVR) module and two auxiliary switches HQ. The undervoltage release (UVR) trips the breaker when control voltage drops below a threshold — common in safety circuits where a loss of control power must open the main disconnect. With two auxiliary switches HQ, the panel gets status feedback without adding external relays.
Thermal derating and enclosure integration
The 50 A rating holds from 40 °C to 50 °C, then derates to 49 A at 55 °C and 45 A at 70 °C. If this breaker lives in a sealed panel or near a furnace line, the 70 °C limit (operating maximum) is the hard ceiling — the thermal curve governs real current, not the nameplate. The insulation voltage of 800 V covers 480 V and 600 V class systems with margin.