63 A MCCB with ETU350 — line protection, shunt trip, 242 kA interrupt rating
The Siemens SENTRON 3VA2163-6HN32-0KL0 is a 3-pole molded case circuit breaker rated for 63 A continuous current at 40 °C, with a maximum interrupting capacity of 242 kA at 240 V — sufficient for high-fault utility or transformer-fed distribution panels where available short-circuit current exceeds typical MCCB ratings. The ETU350 electronic trip unit provides adjustable long-time, short-time, instantaneous, and ground-fault protection curves, making this breaker suitable for feeder or main disconnect duty in 480 V industrial switchgear. The integrated shunt trip (STL) release allows remote tripping via a control signal, and the auxiliary contact package includes two auxiliary switches plus separate trip and electrical alarm switches for status feedback to a PLC or SCADA system.
Breaking capacity across voltage levels
The 3VA2163-6HN32-0KL0 delivers 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 5 kA at 690 V. This steep derating above 500 V is typical for molded case breakers with electronic trip units; at 690 V the device still clears 5 kA, adequate for most 690 V load-side faults but not for high-fault bus applications at that voltage. For a 480 V panel with a 100 kA available fault current, this breaker holds a comfortable margin at 187 kA.
Current derating over temperature
Rated 63 A from 40 °C through 50 °C, the breaker begins linear derating above 55 °C: 60.6375 A at 55 °C, 58.275 A at 60 °C, 55.9125 A at 65 °C, and 53.55 A at 70 °C. In a sealed, uncooled enclosure with multiple breakers ganged, expect to apply the 70 °C derating factor if internal ambient reaches that level. The rated insulation voltage is 800 V, and the operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C. Maximum power loss is 4 W.