What it is and what it does
The Siemens SENTRON 3VA1163-4EF36-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, designed for line protection in distribution panels. Its breaking capacity hits 121 kA at 240 VAC and 75.6 kA at 415 VAC — numbers that tell you it handles high-fault scenarios without cascading upstream. The 800 V rated insulation voltage means it's comfortable in 480 V and 600 V class systems.
Ratings that matter for fit
The 63 A rating holds flat from 40 °C to 50 °C, then derates to 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C (–). If your panel ambient runs hot, you lose 5 A by 70 °C — factor that into your load calc. Breaking capacity drops with voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V (–). That 11.9 kA at 690 V is your limiting number for 600 V class systems.
Built-in auxiliaries and release
This MCCB ships with an undervoltage release (UVR) and a 2 auxiliary switch + 1 trip alarm switch configuration. That means you get remote status indication and undervoltage protection without adding separate accessory modules — saves DIN rail space and wiring time. The trip indicator gives local visual confirmation of a fault trip.
Physical fit and panel integration
Dimensions are 76.2 mm wide, 130 mm tall, 70 mm deep (–). That 3-inch width is standard for a 3-pole MCCB in this class — drops into existing SENTRON or competitive panel layouts without re-drilling. Power loss is 19.8 W maximum, so account for that heat in your enclosure sizing. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.