Parameter Specification Device Type Rotary Isolator Switch / Disconnector (Load Break Switch) Product Series MJ / MJS Series Rated Operational Current (Ie) 60 A (at AC-22A / AC-23A duty) Number of Poles 4 Poles (3P + N) (Based on common "B" variant coding. Other variants exist, e.g., "A" for 3P, "C" for 2P). Must be confirmed on the device or datasheet. 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 (600 A) for AC-23A at 400V. Short-Time Withstand Current (Icw) Typically 10 kA for 1 second (ensures 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 handle. Handle is often detachable and can be padlocked in the OFF position (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. 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