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MJS12-60B

The ABB MJS12-60B is a rotary load break switch / isolator switch from the versatile MJ/MJS series of manual control and switching devices. It serves as a robust and reliable main switch or functional isolator in electrical distribution boards, machine control panels, and industrial enclosures.

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Parameter Specification Device Type Rotary Load Break Switch / Disconnector Product Series MJ / MJS Series Rated Operational Current (Ie) 60 A (at specified utilization category) Number of Poles 2 Poles (2P) Rated Insulation Voltage (Ui) 690 V Rated Operational Voltage (Ue) 400 V AC / 500 V AC Utilization Category AC-22A (Switching of mixed resistive and inductive loads). AC-23A (Switching of motor loads or other highly inductive loads). Rated Making & Breaking Capacity Typically ≥ 10 x Ie (e.g., 600 A) for AC-23A at 400V. Short-Time Withstand Current (Icw) Typically 10 kA for 1 second (This is a key safety parameter, ensuring it can withstand fault currents without damage). Mechanical Durability ≥ 10,000 operations Electrical Durability ≥ 5,000 operations (at rated current) Control Method Manual rotary operation via a detachable handle. The handle can be padlocked in the OFF position (typically with up to 3 padlocks). Mounting Mounts directly onto a panel or enclosure door via a mounting kit. The switch body is mounted behind the panel. Terminal Type Screw clamp terminals. The "B" variant may include snap-on protective terminal covers. Terminal Connection Capacity Typically up to 35 mm² (for 60A model). Protection Degree Switch body: IP00 (must be installed inside an enclosure). With handle mounted on door: Typically achieves IP54 or higher for the front. Ambient Temperature (Operation) -25°C to +60°C Standards Compliance IEC/EN 60947-1, IEC/EN 60947-3