Siemens 3VA1225-5EF32-0HC0 — SENTRON MCCB, 250 A, Line Protection
The Siemens 3VA1225-5EF32-0HC0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A at 40 °C, configured for line protection in three-pole form. The 187 kA breaking capacity at 240 V means it can safely clear a bolted fault at that level without rupturing — critical for high-fault service entrances or transformer secondaries. At 415 V the interrupting rating drops to 121 kA, at 440 V to 75.6 kA, at 500 V to 30 kA, and at 690 V to 17 kA, so the voltage class of the installation governs which rating applies. The breaker carries a rated insulation voltage of 800 V, so it is insulated for 690 V line-to-line systems with margin. Rated current holds at 250 A from 40 °C through 50 °C, then derates linearly to 223 A at 70 °C. That means a panel running at 55 °C ambient can still load the breaker to 243 A, but at 65 °C you lose 20 A of headroom. The maximum power loss is 57 W, so account for heat dissipation in a sealed enclosure.
Dimensions and Panel Fit
The 3VA1225-5EF32-0HC0 measures 105 mm wide × 158 mm high × 70 mm deep (4.13 × 6.22 × 2.76 in). The 70 mm depth clears most standard enclosures with room for rear busbars.
Internal Configuration
This variant ships with a shunt trip (STL) auxiliary release and two HQ auxiliary switches pre-installed. The basic switch is order code 3VA12255EF320AA0 — that is the switching mechanism inside the molded case. There is no undervoltage release, no ground-fault monitoring, and no communication function on this SKU. The voltage trigger is present, meaning the shunt trip can be wired to a remote pushbutton or safety relay for emergency off.