MCCB with high breaking capacity for line protection
Breaking capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that determine whether this breaker clears a fault without upstream coordination issues.
The 121 kA at 240 V and 75.6 kA at 415 V ratings mean this breaker handles high available fault currents common in industrial switchboards — a panel with a 100 kA SCCR at 240 V is fully covered. For 690 V applications the 11.9 kA figure is lower, so verify coordination with upstream devices if the fault current exceeds that threshold.
Thermal derating curve
Above 55 °C the current derates: 15.36 A at 55 °C, 15.04 A at 60 °C, 14.72 A at 65 °C, and 14.4 A at 70 °C. That simplifies ordering but means you cannot adjust the long-time or short-time pickup in the field. For applications needing adjustable trip curves, a different 3VA variant with an electronic release would be the correct choice.
Width 76.2 mm, height 130 mm, depth 70 mm. Depth 70 mm leaves room for rear-connected busbars or accessory modules.
Auxiliary contacts and accessories
Comes with two auxiliary switches HQ (high-quantity) factory-fitted — these signal the breaker's open/closed status to a PLC or status lamp. The shunt trip (STL) release is built in, with the auxiliary release order code 3VA9688-0BL30 for reference.
Environmental limits
The storage minimum of -40 °C matters for unheated warehouses in cold climates — the breaker can sit on a shelf at -40 °C without damage, but it must be warmed above -25 °C before energizing.