Line protection MCCB with flat thermal derating
The Siemens SENTRON 3VA2063-5HL36-0DL0 is a 3-pole molded case circuit breaker rated for 63 A continuous current, designed for line protection in distribution panels. It carries a full interrupting capacity of 187 kA at 240 V AC, stepping down to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V — so the SCCR headroom at common low-voltage levels lets you coordinate downstream without cascading upstream breakers. Thermal performance is flat across the operating range: the 63 A rating holds from 40 °C through 70 °C ambient, with no derating curve to calculate for standard panel environments. That simplifies panel design — no need to upsize the frame for a warm enclosure. The breaker ships with an undervoltage release (UVR) and a full auxiliary switch complement: 2 auxiliary switches plus 1 trip alarm switch and 1 electrical alarm switch (HQ type). That covers remote status monitoring and undervoltage protection in one package — no separate add-on modules needed for basic signaling.
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA frame footprint that drops into existing panel layouts without re-drilling. The 3-pole width matches common busbar spacing for 63 A distribution. Power loss at rated current is 7.9 W maximum — low enough that ventilation requirements in a typical IP4X enclosure are minimal. The UVR coil draw is internal; no external power supply needed for the release function.