The Schneider Electric EZESHT440AC is a shunt trip release (SHT) from the EasyPact range, for EZCV250 and EZC250 breakers. It trips the breaker when 440...480 V AC 50/60 Hz is applied, with an operating threshold of 0.7 Un.
Schneider lists the EZESHT440AC as Obsolete. No direct successor order code is provided in the evidence.
The 440...480 V AC control voltage range matches standard 480 V industrial control circuits common in North American and some European panels. The 0.7 Un tripping threshold ensures the release operates even if the control voltage sags to 308 V (at 440 V nominal) or 336 V (at 480 V nominal) — a practical margin for brownout conditions on a control transformer. Connection is via lead wires, so panel wiring is straightforward: strip, terminate, and route to the breaker's shunt trip terminals.