63 A 4-pole MCCB with shunt trip — line protection for 400 V distribution
The Siemens SENTRON 3VA1063-2ED42-0HC0 is a 4-pole molded case circuit breaker rated for 63 A continuous at 40 °C through 50 °C, with a TM210 thermal-magnetic overcurrent release and an integrated shunt trip (STL) auxiliary release. It is built for line protection in 400 V-class distribution panels, where the 52.5 kA breaking capacity at 240 V and 32 kA at 415 V handle high-fault scenarios without cascading upstream. The 800 V rated insulation voltage (Ui) means it can sit on 690 V bus systems, though the interrupting rating at 690 V drops to 7.5 kA — a figure to check against the available fault current if used at that voltage. The breaker carries 2 HQ auxiliary switches (form C) for status feedback to a PLC or annunciator panel, and the shunt trip (STL) allows remote tripping via a control signal — useful for emergency-stop circuits or interlocking with a fire-alarm system. The release is ordered separately as 3VA9688-0BL30.
Thermal derating and panel fit
At 55 °C the breaker is rated for 60.48 A, dropping to 56.7 A at 70 °C — a linear derating curve that matters when the MCCB is packed into a warm enclosure with other heat sources. The 101.6 mm width (4-pole frame) and 70 mm depth fit standard Siemens 3VA mounting bases; the 130 mm height is consistent across the 3VA platform, so a panel laid out for a 3VA1010 frame accepts this unit without drilling new holes. IP40 on the front means it is protected against tools and wires >1 mm, but the terminals are not sealed — keep it inside a panel, not in a washdown zone.