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The SZW26-125 D202.2BF is a heavy-duty rotary changeover switch with a rated current of up to 125A. It features a three-position (1-0-2) two-position (two-section) structure, fully encapsulated in an IP65-rated housing. Designed for dual-path switching and safe isolation of ultra-high current circuits, its contact logic is clear: position "1" connects the first set of contacts (1-2, 5-6); position "2" connects the second set of contacts (3-4, 7-8); the middle position "0" ensures all contacts are completely disconnected, providing a clear and safe electrical isolation point. It is suitable for AC 440V/50-60Hz and DC 240V circuits, with a rated insulation voltage of 660V. Internally, it uses large-section, thickened copper conductors and silver alloy contacts, ensuring low contact resistance, high current carrying capacity, and arc resistance at 125A. Its M6-sized wiring screws can connect large cross-section wires of 35-50 mm², meeting the reliable connection requirements under high current density. The IP65 protective housing completely prevents dust intrusion and low-pressure water spray, with a mechanical life ≥100,000 cycles and an electrical life ≥30,000 cycles.
Main Technical Parameters
Rated Specifications: Rated current 125A; Rated voltage AC 440V (50/60Hz) or DC 240V.
Contact Configuration: Two-section (layer) structure, 8 terminals in total. Enables switching and isolation between two high-current loads or power supplies.
Protection Rating: IP65 (dustproof, water-resistant).
Wiring Capacity: M6 screws, 35-50 mm² wires, tightening torque 2.5 N·m.
Mechanical and Electrical Life: Mechanical life ≥ 100,000 cycles; Electrical life ≥ 30,000 cycles (under rated load). Operating Environment: Temperature -25°C to +40°C, altitude ≤2000m, adaptable to typical industrial environmental humidity.
Application Scenarios: This switch is specifically designed for critical industrial applications requiring manual switching, transfer, or safe isolation of ultra-high current main circuits in harsh environments.
Main/Backup Power Switching for High-Power Equipment: Serves as a manual power selection switch for equipment such as large water pumping stations, central air conditioning units, electric furnaces, high-power DC power supplies, and generator set parallel cabinets, reliably switching between two incoming power supplies or "one for use, one for backup" loads.
Heavy Industry and Power Distribution Systems: Used as a manual disconnector or load switching switch for 125A-class core feeder circuits in power distribution centers and motor control centers (MCCs) in industries such as metallurgy, chemical engineering, mining, and shipbuilding. Its protection capabilities are suitable for dusty and humid industrial environments.
High-Current DC Applications: Suitable for applications requiring manual switching of high-current DC (≤240V/125A) paths, such as electrolysis, electroplating, DC motor drives, and battery systems.
Outdoor and mobile equipment: With IP65 protection, it can be directly used in the electrical control systems of large outdoor equipment, heavy engineering machinery, and special vehicles, enabling high-power operation modes or power selection for accessories, and is resistant to wind, rain, vibration, and dust.
