The Siemens SENTRON 3VA1163-4EF36-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 63 A at 40 °C with no derating up to 50 °C. The 121 kA interrupting rating at 240 V AC gives you headroom for high-fault service-entrance or distribution panels; at 415 V it still holds 75.6 kA, and at 690 V it's rated 11.9 kA. That's a single breaker that covers both 240 V and 400 V class systems without a frame-size jump.
Sizing and thermal performance
Rated current holds flat at 63 A from 40 °C through 50 °C ambient — no early derating. At 55 °C it drops to 62 A, at 65 °C to 60 A, and at 70 °C to 58 A. That's a shallow curve; you can run this breaker near its full rating in a warm enclosure without oversizing. The insulation voltage is rated 800 V, so the 690 V interrupting rating is fully within the dielectric design.
Auxiliaries and releases
Factory-fitted with a shunt trip (STL) release and a configuration of 2 auxiliary switches plus 1 trip alarm switch (HQ). The shunt trip lets you remotely trip the breaker from a safety circuit or emergency-stop chain — common on conveyor and pump panels. No undervoltage release is installed, and no ground-fault monitoring module is included. The trip indicator and voltage trigger are present, so you get a local mechanical flag and a remote signal on fault.
Dimensions and panel fit
Width is 76.2 mm (3 in), depth 70 mm (2.76 in), height 130 mm (5.12 in). That's a standard 3-pole MCCB footprint for the 63 A frame — it fits the same DIN-rail or screw-mount pattern as other SENTRON 3VA breakers in this current class. Power loss is 17.3 W maximum at rated load, so plan for that heat in the enclosure thermal calculation.