The MGN60589 is a 1-pole C60N miniature circuit-breaker from the Multi9 range, rated 4 A with a D tripping curve. The D curve means the magnetic trip fires at 12 x In (±20 %) — so between 38.4 A and 57.6 A for a short-circuit or heavy inrush — making it the right choice for loads with a high starting surge like small motors, transformers, or solenoid banks where a B or C curve would nuisance-trip on startup. Breaking capacity is 10 kA Icu at 240 V AC phase-to-neutral per EN/IEC 60947-2, which covers most commercial and light industrial panel fault levels at that voltage; at 415 V AC the Icu drops to 3 kA, so if your line side is 400 V three-phase you need to check the available fault current against that lower figure. The service breaking capacity Ics is 75 % of Icu (7.5 kA at 240 V, 2.25 kA at 415 V), meaning it can safely clear and be reclosed after a fault at those levels — not just a one-shot clearance.
Depth is 73 mm, height 81 mm. The toggle gives local ON/OFF indication and a contact position indicator confirms the state of the moving contacts — useful during panel commissioning or fault isolation.