The Schneider Electric EZEUVR277AC is an undervoltage release (device short name MN) for the EasyPact EZC250 and EZCV250 molded-case circuit breaker ranges. The operating threshold is 0.35 to 0.7 Un for opening (the undervoltage trip point) and 0.85 Un for closing (the pick-up voltage). This means the release will drop the breaker when the line voltage falls to roughly 97–194 V AC, and will allow the breaker to close only when the voltage recovers above about 235 V AC.
Fit and deployment context
The release mounts inside the EZC250 or EZCV250 breaker — no separate DIN-rail footprint. It is a control accessory, not a standalone device, so the panel integration is simply snapping it into the breaker's accessory slot before the breaker is installed on the DIN rail or mounting plate.