Siemens SENTRON 3VA2125-7KQ36-0AA0 — 25 A MCCB with 330 kA Breaking Capacity
Its headline breaking capacity reaches 330 kA at 240 VAC, dropping to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V — meaning it can safely interrupt fault currents up to those levels without cascading upstream, critical for high-fault installations like transformer secondaries or large motor control centers.
Selectivity and Coordination
With a minimum trip setting of 38 A and maximum of 300 A, this MCCB offers a wide adjustment range for coordinating with downstream branch breakers — useful for achieving selective coordination in a multi-level distribution scheme where you want only the faulted branch to open.
A communication function and other measurement function are built in, along with summation-current ground-fault monitoring on the L-conductor — so this unit can report status and fault data to a higher-level control system without an external module.