What this 2 A Curve D MCB does in the panel
The MGN60507 is a single-pole C60N miniature circuit breaker from the Multi9 range, rated 2 A at 50 °C with a D tripping curve. The breaking capacity is 10 kA Icu at 240 V AC phase-to-neutral, and 3 kA Icu at 415 V AC, both per EN/IEC 60947-2.
The 18 mm width (one modular pitch) means it takes up a single slot.
Service breaking capacity Ics is 7.5 kA (75 % of Icu) at 240 V, and 2.25 kA at 415 V. Pollution degree 3, so it's rated for the conductive-dust and humidity conditions typical of industrial control panels. Electrical durability is 10,000 cycles, mechanical 20,000 cycles. The thermal-magnetic trip unit is non-interchangeable — what you see is what you get, no field-swap of the trip module.
