Siemens 3VA1225-4GF42-0JC0 — 250 A fixed MCCB, line protection, shunt trip
The Siemens SENTRON 3VA1225-4GF42-0JC0 is a molded case circuit breaker (MCCB) rated for 250 A fixed, 4-pole, designed for line protection. It carries a shunt trip release (STL) and two HQ auxiliary switches built in. Breaking capacity hits 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V — the SCCR curve you need for selectivity studies on a 480 V or 400 V distribution panel. Thermal derating starts at 55 °C: full 250 A up to 50 °C, then 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, 223 A at 70 °C. Insulation voltage rated 800 V. Power loss 57 W max.
Sourcing & lifecycle — active, quoted to order
Dimensions: 70 mm depth, 140 mm width, 158 mm height — fits standard SENTRON panel footprints. No trip indicator, no undervoltage release, no communication function on this variant.
Integration note — shunt trip and auxiliary switch complement
The shunt trip (STL) allows remote tripping via a control signal — typical for emergency-stop or undervoltage protection schemes. Two HQ auxiliary switches provide status feedback for the breaker position (open/closed/tripped) back to a PLC or panel indication. Operating temperature range -25 °C to +70 °C; storage -40 °C to +80 °C. The supplied basic switch carries order code 3VA12254GF420AA0.