63 A MCCB with 187 kA interrupting capacity — line protection for high-fault panels
The Siemens SENTRON 3VA2063-5HN36-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C through 70 °C ambient — no derate needed across that range. Its interrupting capacity hits 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA figure at 240 V means it can safely clear a bolted fault on a large step-down transformer secondary or a high-capacity bus without cascading upstream. Designed for line protection (feeder duty), it includes an undervoltage release (UVR) as the auxiliary release type.
Panel fit and integration
Dimensions: 86 mm deep, 105 mm wide, 181 mm tall. Rated insulation voltage is 800 V. Power loss is 7.9 W maximum.