The Siemens SENTRON 3VA1163-4EF36-0AG0 is a 3-pole molded case circuit breaker (MCCB) with a TM240 thermal-magnetic release, rated for line protection in distribution panels. It carries 63 A continuously at 40 °C, derating to 58 A at 70 °C — the thermal curve matters when the breaker lives in a crowded enclosure with other heat sources. Breaking capacity is the headline number here: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and still 11.9 kA at 690 V. That 121 kA at 240 V means it clears high-fault conditions on the secondary side of a step-down transformer or a large commercial service entrance without upstream fuses needing to open. At 690 V the 11.9 kA still covers most motor-drive branch circuits. Rated insulation voltage is 800 V, so the breaker is electrically rated for 690 V systems with margin. The TM240 release provides thermal protection for overloads and magnetic (instantaneous) protection for short circuits — a standard thermal-magnetic curve, no electronic adjustment. This is a fixed-release MCCB, not a trip-unit-swappable frame.
Lifecycle and compliance
The 3VA1163-4EF36-0AG0 includes a trip indicator and comes with one auxiliary switch plus one trip alarm switch (HP type) as standard. No undervoltage release, no ground-fault monitoring, no communication function — it's a straight line-protection breaker with alarm feedback for the PLC or annunciator.
Integration and mounting
Dimensions: 70 mm deep, 76.2 mm wide, 130 mm tall. Maximum power loss is 17.3 W. In a sealed enclosure with multiple breakers, that heat adds to the internal temperature rise — the derating curve from 63 A at 40 °C down to 58 A at 70 °C accounts for this. Panel builders should factor the cumulative dissipation when sizing ventilation.