The G12UVR415AC is an MN undervoltage release from the Schneider Electric GoPact MCCB family, designed for the GoPact MCCB 125 frame. It operates on a 415 V AC 50/60 Hz control circuit and drops the breaker when the control voltage falls below its threshold — specifically, it trips the MCCB when voltage drops to 0.35 to 0.7 times the nominal Un, and allows closing only when voltage is restored to 0.85 to 1.1 times Un. This is the standard undervoltage protection pattern for motor control centers and distribution panels where a voltage dip or loss must automatically disconnect the load to prevent uncontrolled restart.
The 415 V AC control voltage is the coil rating, not the main circuit voltage — this release is wired to a separate control transformer or panel supply that stays live when the main bus is healthy. The 25 ms response time is the mechanical trip delay once the undervoltage condition is detected; fast enough to protect motors from a sag that could stall them, but not a high-speed arc-flash mitigation device. Holding power consumption is 3.5 VA, pick-up (inrush to seal the coil) is 5 VA — negligible for a control transformer, but worth confirming the transformer VA budget if you're adding this to a densely populated panel.