The Schneider Electric EZEUVR400AC is an undervoltage release (MN type) from the EasyPact range, designed for the EZC250 and EZCV250 molded-case circuit breaker families. It trips the breaker when the control voltage drops below 0.35 to 0.7 Un, and allows reclosure only after voltage recovers above 0.85 Un — a standard undervoltage protection function for motor control and process safety circuits.
It must be fed from a separate control transformer or the same phase-to-phase supply, depending on the panel design. The operating threshold (0.35...0.7 Un opening, 0.85 Un closing) means the release will drop the breaker if the control voltage sags below roughly 133 V (at 380 V nominal) to 290 V (at 415 V nominal), and will not let the breaker reclose until the voltage recovers above 323-353 V. This is a deliberate hysteresis band to prevent chatter on a recovering supply.
Deployment Context
This release mounts inside the EZC250 or EZCV250 breaker — no DIN rail or separate enclosure. It is wired to the control circuit in the panel, typically downstream of a control transformer or UPS. The MN function is standard for undervoltage protection on motor starters, conveyor safety circuits, and any process where a loss of control voltage must automatically disconnect the load.