It's a control accessory, not a standalone breaker, sized for the drawout chassis of the MTZ1, MTZ2, and MTZ3 frames. Rated for 12 V DC control, the release operates across a 0.7 to 1.1 Un threshold tripping voltage range. Holding power is 4.5 W / 4.5 VA. Response time is 50 ms ±10% across all MTZ frame sizes — consistent enough for coordinated tripping schemes where the opening coil must act within a defined window relative to the breaker's own trip unit.
What the drawout mounting means for your panel
Drawout mounting means this release installs into the MasterPact MTZ's removable chassis, not a fixed panel mount. The accessory connects via the breaker's internal wiring harness, so the panel wiring stays undisturbed when the breaker is racked out.