With an insulation voltage rating of 800 V and a maximum power loss of 10.8 W, this MCCB is sized for standard 3-phase distribution in commercial and light industrial switchboards.
Breaking Capacity — What the Ratings Mean
At 240 V AC, this MCCB interrupts 121 kA; at 415 V AC, 75.6 kA; at 440 V AC, 52.5 kA; and at 500 V or 690 V AC, 11.9 kA. These figures govern where the breaker can be applied in the fault-current hierarchy — it will hold coordination downstream of a larger upstream device only if the available fault current stays within these limits. The 121 kA rating at 240 V is typical for high-capacity MCCBs used near large transformers or generator feeds.
Current Rating vs. Ambient Temperature
Rated 40 A from 40 °C to 50 °C, the breaker derates to 39 A at 55–60 °C and 38 A at 65 °C, then 37 A at 70 °C.
Dimensions are 76.2 mm wide, 130 mm high, and 70 mm deep — a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation in distribution boards. This variant ships without undervoltage release, voltage trigger, or ground-fault monitoring, but includes provision for up to 4 auxiliary switches (HQ type) for remote status indication.