What this MCCB carries — and what it means for your panel
The Siemens 3VA1125-6EF32-0DH0 is a SENTRON molded case circuit breaker rated for 25 A continuous at 40 °C ambient, with a 3-pole construction and a line protection design. That 25 A holds steady through 50 °C — only dropping to 24 A at 55 °C and 23 A at 70 °C — so in a warm panel you still get full rated current without derating the branch. The breaking capacity is 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V, dropping to 17 kA at 500 V and 690 V. For a 480 V distribution board, the 121 kA at 440 V figure is the one that governs SCCR compliance; at 690 V the 17 kA still handles most industrial fault levels.
Auxiliary and release configuration — what ships inside
This variant comes factory-fitted with two auxiliary switches plus one trip alarm switch (HQ), and an undervoltage release (UVR). The UVR means the breaker trips on loss of control voltage — a common requirement for safety circuits and emergency-stop chains where you want the load disconnected if the control supply drops. The auxiliary switches give status feedback to a PLC or indicator panel without adding external relays. No ground-fault monitoring module is included; this is a straight line-protection breaker, not a GFCI variant.
Dimensions and panel fit
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm tall — a standard SENTRON 3VA1 footprint that drops into existing DIN-rail or screw-mount panels without re-drilling. The 76.2 mm width (3 inches) is the same as the 3VA1110 frame, so if you are swapping a lower-current unit for this 25 A version, the busbar and mounting holes align.