SENTRON 3VA1125-4EF32-0HH0 — MCCB for Line Protection
The Siemens SENTRON 3VA1125-4EF32-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. It carries 25 A continuously at 40 °C and delivers a high interrupting capacity — 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 500 V and 690 V. The 70 mm depth, 76.2 mm width, and 130 mm height fit standard panel layouts, and the design includes a trip indicator and voltage trigger.
Interrupting Capacity and Thermal Derating
The interrupting ratings span from 121 kA at 240 V down to 11.9 kA at 690 V, giving selectivity headroom for high-fault panels. The continuous current holds at 25 A from 40 °C to 50 °C, then derates to 24 A at 55–60 °C and 23 A at 65–70 °C — useful when the breaker sits in a warm enclosure near other heat sources.
Auxiliary and Release Configuration
This variant ships with 2 auxiliary switches plus 1 trip alarm switch (HQ) and a shunt trip release (STL). No undervoltage release, no ground-fault monitoring, and no communication function — it is a straightforward line-protection breaker with remote trip capability.