The MGN60523 is a Schneider Electric C60N miniature circuit breaker from the Multi9 range, built for distribution duty in 50/60 Hz AC networks. It's a 2-pole unit rated 16 A at 50 °C with a D-curve — magnetic trip at 12 x In, so it handles the inrush of motor loads, transformers, or welding gear without nuisance tripping on startup. Breaking capacity is the headline here: 20 kA Icu at 240 V phase-to-phase, 10 kA at 415 V, and 6 kA at 440 V, all per EN/IEC 60947-2. The service breaking capacity (Ics) is 75 % of Icu — 15 kA at 240 V, 7.5 kA at 415 V — so after clearing a high-energy fault it's still usable, not a one-shot part. Thermal-magnetic trip technology covers both overload (thermal bimetal) and short-circuit (magnetic solenoid). The D-curve's 12 x In magnetic threshold means a 192 A instantaneous trip — sized for the inductive kick of a small motor or a control transformer bank. Rated operational voltage is 440 V AC max, so it's fine for 400 V three-phase distribution panels.
Width is 36 mm (4 x 9 mm pitches), height 81 mm, depth 73 mm. Wire strip length 14 mm.
What the D-curve and ratings mean for selectivity
D-curve at 12 x In gives you headroom for coordination with downstream C-curve MCBs. In a typical sub-distribution board feeding motor starters, this 16 A D-curve upstream of a 6 A C-curve for a contactor coil holds selectivity up to about 6 kA — the downstream breaker clears the fault before the upstream trips. Pollution degree 3 (industrial environment) and category A (non-selectivity for short-circuit) per 60947-2. Electrical endurance rated at 10,000 cycles, mechanical at 20,000 cycles.