The LV839224 is a switch module accessory for the MasterPact MTZ range of air circuit breakers from Schneider Electric. It's an add-on component that fits into the breaker's accessory compartment, providing a switching function for auxiliary circuits or control signals tied to the breaker's position or status.
If you're integrating this into a panel, it mounts inside the MasterPact MTZ breaker's accessory bay — the same slot that takes auxiliary contacts, shunt trips, or undervoltage releases. No separate DIN-rail space needed; it's a snap-in fit behind the breaker's front cover. Wiring is to the breaker's internal terminal block, so plan your control-wire routing to the breaker position, not to a separate enclosure location.