The Siemens SENTRON 3VA2163-6HN36-0CC0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up. Breaking capacity hits 242 kA at 240 V AC, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 3.7 kA at 690 V. That 242 kA figure at 240 V means it handles high-fault scenarios common on the secondary side of large step-down transformers without cascading upstream.
What the ratings mean for fit
The 63 A rating is flat from 40 °C to 70 °C — that's a solid thermal design. Many breakers in this class start derating above 40 °C; this one holds its full ampacity, so it's a good pick for a crowded panel or a hot environment like a motor control center near a furnace line. The 242 kA interrupting rating at 240 V is high for a 63 A frame — it's sized for fault currents you'd see on the line side of a large distribution panel, not just downstream branch protection. At 690 V the rating drops to 3.7 kA, which is typical for a molded case breaker at that voltage; don't spec it for a 690 V circuit with high available fault current.
Built-in auxiliaries and release
This variant ships with two auxiliary switches (HQ type) and an undervoltage release (UVR) already fitted. That saves panel-build time — no separate ordering or field-fitting of the UVR coil. The auxiliary switches give remote status indication for the breaker position (open/closed/tripped), which is useful for a PLC input or a status lamp on the door. The UVR trips the breaker when control voltage drops below a threshold — standard for safety circuits where loss of control power should open the main disconnect. Verify the UVR coil voltage rating against your control supply before wiring.
Physical fit
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. The 86 mm depth (3.39 in) fits most enclosures.