The MGN60642 is a 3-pole C60H miniature circuit-breaker from the Multi9 range, rated 25 A at 50 °C with a C-curve trip characteristic.
The headline breaking capacity is 30 kA Icu at 240 V AC phase-to-phase, dropping to 15 kA at 415 V AC and 10 kA at 440 V AC. For DC circuits it's rated 25 kA at 125 V DC. The Ics (service breaking capacity) is 50 % of Icu across the AC voltages — so at 240 V AC that's 15 kA, and at 125 V DC it's 40 kA at 100 %. The 30 kA rating at 240 V AC gives headroom for high-fault installations near transformers or large motor banks.
Strip length is 14 mm on the power circuit. The 54 mm width (6 x 9 mm pitches) means it occupies three modular spaces on the rail. IP20 finger-safe protection is standard for the enclosure; the busbar and distribution block can be fed from top or bottom.