The Siemens SENTRON 3VA2163-5KP32-0AH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 63 A. Its ETU850 electronic trip unit provides adjustable overload and short-circuit protection curves, making it suitable for feeder and main breaker duty in distribution panels. Breaking capacity reaches 187 kA at 240 V AC, 121 kA at 415/440 V, 79 kA at 500 V, and 4.25 kA at 690 V — figures that cover high-fault utility feeds and transformer secondaries. The 800 V rated insulation voltage (Ui) gives headroom for 690 V line-to-line systems. The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type) pre-installed — no separate order for basic status feedback. Communication function is built in, supporting remote monitoring and integration with higher-level control systems.
Sizing and thermal derating
Rated 63 A continuously at 40 °C, 45 °C, and 50 °C ambient. Derating begins at 55 °C (60.6 A), stepping down to 53.6 A at 70 °C. Operating ambient range is -25 °C to +70 °C; storage range extends from -40 °C to +80 °C. Maximum power loss is 4 W — low enough that ventilation spacing in a standard enclosure is adequate. Front IP40 protection means the breaker face is protected against tools and small wires, but the body is not sealed against washdown.
Panel fit and mounting
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. The 3-pole frame mounts on a standard DIN rail or via screw-mount lugs in a distribution panel. Verify cutout depth against the 86 mm projection behind the panel face — the ETU850 display and communication module add no extra depth beyond the listed figure.