The Siemens 3VA1112-5EF32-0HH0 is a SENTRON 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 125 A continuously across the 40-50 °C ambient range before derating begins at 55 °C (122 A) down to 114 A at 70 °C. Its interrupting capacity hits 187 kA at 240 V AC, stepping down to 121 kA at 415 V and 75.6 kA at 440 V — numbers that tell you it handles high-fault utility feeds or transformer secondaries without cascading upstream.
Breaking capacity and what it means for your panel
The 187 kA at 240 V is the headline number — it means this breaker can safely clear a fault current up to that level at 240 V without welding contacts or rupturing the case. At 415 V it still holds 121 kA, and at 440 V it's 75.6 kA. That's a high-interrupting MCCB, sized for main or feeder duty in industrial switchboards where available fault current is substantial. The 17 kA rating at 500 V and 690 V is the same figure — the breaker's performance plateaus at higher voltages.
Auxiliary and trip configuration
This variant ships with a shunt trip release (STL) and a complement of 2 auxiliary switches plus 1 trip alarm switch (HQ designation). The shunt trip lets you remotely trip the breaker via a control signal — useful for emergency-stop circuits or interlocking with upstream gear. The auxiliary switches mirror the breaker's open/closed state; the trip alarm signals a fault trip specifically. No undervoltage release is fitted, and there's no communication module onboard — it's a straight electromechanical MCCB.
Dimensions and panel fit
At 130 mm high, 76.2 mm wide, and 70 mm deep, the 3VA1112-5EF32-0HH0 fits the standard SENTRON 3VA molded case footprint. The 76.2 mm (3-inch) width per pole is typical for this class — three poles occupy about 9 inches of DIN-rail or panel-mount space. Depth of 70 mm (2.76 in) leaves room for rear connections and arc-chamber clearance inside the enclosure.