Breaking capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. No need to downrate for a hot enclosure — that simplifies panel design in non-climate-controlled environments.
Motor protection and trip unit
The ETU550M trip unit is the electronic brain here — it provides adjustable overload protection, short-circuit protection, and ground-fault monitoring (though this variant ships without ground-fault detection). Communication function is included, meaning this breaker can report status and trip events to a PLC or BMS over the SENTRON communication bus — useful for remote monitoring on a motor control center. Operating power at AC-3 duty (motor switching) is 5.5 kW at 230 V — that's the real-world motor rating for a standard three-phase induction motor. The 25 A frame covers most small-to-medium pump, fan, and conveyor motors.
That's a standard SENTRON 3VA2 frame size — it clips onto the DIN rail or mounts via the screw terminals. The 86 mm depth means it fits in shallow enclosures where full-height MCCBs won't clear the door. Mount inside a panel rated for the environment.