The MGN25081 is a C60H miniature circuit breaker from the Multi9 range, rated 2 A with a D trip curve and single-pole construction. The D curve means the magnetic trip threshold is 10 to 20 times In (here 12 x In ±20%, so 20 to 28 A instantaneous trip) — designed for loads with high inrush, like small transformers, solenoid valves, or motor control circuits where a B or C curve would nuisance-trip on startup. The 15 kA Icu at 240 V AC phase-to-neutral tells you this MCB can safely interrupt a fault current up to 15 kA without welding its contacts; the Ics (service breaking capacity) is 7.5 kA at the same voltage, meaning after clearing a fault at that level it remains functional. That's a healthy margin for most distribution panels fed from a 100 kVA or smaller transformer. The 1P format with 2 module pitches (18 mm per pitch, so 36 mm wide total) snaps onto a 35 mm symmetrical DIN rail. IP20 finger-safe front, pollution degree 3 rated — fine for standard distribution boards but not for wet environments.
Rated operational voltage is 240 V AC phase-to-neutral, 50/60 Hz. For a 2 A D-curve MCB on a 240 V single-phase circuit, expect full selectivity with an upstream 25 A or larger gG fuse or C-curve MCB — the D curve's higher magnetic threshold means it lets through more energy before tripping, so the upstream device must be sized to hold during the inrush. The thermal-magnetic trip unit gives you a thermal bimetal for overload (slow, inverse-time) and a solenoid for short-circuit (instantaneous at 12 x In). Electrical endurance is 10,000 cycles; mechanical is 20,000 cycles — standard for this class, not a high-cycle motor-starting duty.