The Schneider Electric LV839262 is an MN undervoltage release for MasterPact MTZ drawout circuit breakers, operating on a 100-130 V AC/DC control circuit. It is classified as a safety device — when the control voltage drops below the threshold (0.35 to 0.7 Un), the release trips the breaker open, and it will not allow closing until voltage returns above 0.85 Un. This is the standard undervoltage protection function for a drawout power breaker: if you lose control power, the main contacts open, preventing automatic reclosure on an unstable line.
Drawout mounting means this release plugs into the breaker cradle, not onto a DIN rail. The response time is 40 ms ± 5% for the MTZ1 frame, 90 ms ± 5% for MTZ2 and MTZ3 frames — that is the delay from voltage loss to contact opening. Holding power is 4.5 VA / 4.5 W, so the control transformer or UPS supplying the trip circuit needs to budget for that continuous draw. The signalling function reports 'Coil powered MN open Error' — a dry contact or status output that tells the PLC or BMS that the undervoltage coil is energized and the breaker is ready to close.