The G12SHT415AC is a Schneider Electric MX shunt trip voltage release for the GoPact MCCB 125 range. It's the control-side accessory that trips the breaker remotely when you need to drop a load from a panel signal or E-stop circuit. Control voltage range is 110-415 VAC 50/60 Hz, with a threshold tripping voltage of 0.7 to 1.1 times Un. That means it fires reliably even if the control supply sags — useful when the same transformer feeds other coils in the panel. Pick-up power consumption is 5 VA, so it won't load a small control transformer more than a typical contactor coil. Response time is 25 ms from energization to trip. That's fast enough for most control schemes — the MCCB's own mechanical opening time adds to this, but the shunt trip itself isn't the bottleneck in a coordinated protection chain.
Integration notes
Mounts inside the GoPact MCCB 125 frame. No separate DIN rail footprint — it clips into the breaker's accessory slot, so it doesn't eat panel space. Wire the control leads to the shunt trip terminals; polarity doesn't matter on AC coils, but verify the free-wheel diode if you're switching it with a DC PLC output through a relay. The 25 ms response time matters if you're sequencing multiple breakers off a single trip signal — stagger the shunt trip energization to avoid a simultaneous inrush on the control transformer.