Its 3-pole design handles three-phase loads, and the line-protection trip curve (thermal-magnetic or electronic, depending on the internal trip unit) coordinates with downstream breakers to isolate faults without taking the entire panel down. Breaking capacity is the headline number here: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA at 240 V means this breaker can safely interrupt a fault current up to 187 000 A without welding contacts or rupturing the case — critical for high-fault locations like substation secondaries or large motor control centers where available fault current can exceed 100 kA.
Panel Fit and Auxiliary Switching
The 86 mm depth (3.39 in) is shallow enough for shallow backpan enclosures; the 105 mm width (4.13 in) matches the typical 3-pole MCCB slot pitch.