Interrupting Capacity — What the Ratings Mean for Selectivity
The 3VA1125-6EF32-0CH0: This 3-pole SENTRON MCCB carries a TM240 thermal-magnetic overcurrent release and is rated 25 A continuous at 40 °C through 50 °C, derating to 22.5 A at 70 °C. The interrupting ratings are what decide panel coordination: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 690 V. Those numbers tell the site electrical engineer whether this breaker can clear a bolted fault at the secondary side of a distribution transformer without requiring a current-limiting upstream device — at 240 V the 220 kA figure is well above typical utility fault levels, so it can serve as a main or feeder breaker in high-capacity panels. At 690 V the 17 kA rating still covers most industrial motor-circuit faults.
Auxiliary Contacts & Releases — Panel Wiring Note
The breaker ships with an integrated undervoltage release (UVR) and an auxiliary contact block carrying 2 auxiliary switches plus 1 trip alarm switch (HQ type). The UVR ensures the breaker trips on loss of control voltage — standard for safety circuits where a voltage-drop must open the load. The auxiliary contact wiring is accessible from the front terminal block; verify the free-wheel diode polarity on the UVR coil before energizing. The auxiliary trip module is order code 3VA9608-0BB24.
Physical Fit — Panel Cutout & Mounting
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. The 76.2 mm width is a standard 3-pole MCCB footprint for a DIN-rail or screw-mount panel. If your existing panel was cut for a 3VA1010-2ED32-0JA0 or similar 3VA frame, the width and depth are identical — the 3VA1125-6EF32-0CH0 drops into the same mounting slots without rewiring. The front face carries an IP40 protection class, suitable for dry indoor panels.