The MGN60590 is a C60N miniature circuit breaker from the Multi9 range, rated 4 A at 50 °C with a D-curve (magnetic trip at 12 x In ±20 %). Two poles protected, 2P form factor, rated operational voltage 440 V AC. Breaking capacity: 20 kA Icu at 240 V AC, 10 kA at 415 V, 6 kA at 440 V. The service breaking capacity (Ics) is 75 % of those figures — 15 kA at 240 V, 7.5 kA at 415 V, 4.5 kA at 440 V. That means after clearing a fault at the Ics level the breaker is still usable, though you'd typically replace it on a critical circuit. Thermal-magnetic trip unit, Category A (no intentional short-time delay). Suitability for isolation is confirmed — the contact position indicator gives a visible gap when the toggle is OFF. That matters for lockout/tagout: you can verify the contacts are open without pulling a meter.
Snaps onto 35 mm symmetrical DIN rail. Width is 36 mm (4 x 9 mm pitches), height 81 mm, depth 73 mm. The 73 mm depth is the body projection from the rail — check your enclosure depth clearance; a 100 mm deep gland plate leaves enough room for wiring and the tunnel terminals. IP20 finger-safe terminals — fine for a closed panel, not for outdoor exposed mounting.
Compliance: designed to EN/IEC 60947-2. The evidence does not list UL/CSA or RoHS/REACH documentation directly, but the standard itself is the governing specification for industrial MCBs in IEC markets. For a BOM freeze or compliance audit, the manufacturer's declaration pack typically covers the IEC standard and CE marking.