The SZW26-125/3GS is a high-capacity, two-position (OFF-ON) rotary power disconnect switch with a rated current of 125A, featuring a three-section (three-layer) structure. This design utilizes six sets of parallel silver alloy high-current contacts (corresponding to terminals 1-2, 3-4, 5-6, 7-8, 9-10, 11-12) that operate synchronously, all connecting in the "ON" position. The multi-contact parallel arrangement effectively distributes the 125A rated current, significantly reducing single-point contact resistance and on-state heating, ensuring extremely high current carrying capacity and long-term operational reliability. In the "OFF" position, all contacts are completely disconnected, providing safe and reliable electrical isolation. The product is suitable for AC 440V (50/60Hz) or DC 240V circuits and features thickened copper conductors and a high-strength flame-retardant casing. Mechanical life is ≥300,000 cycles, and electrical life is ≥60,000 cycles (under rated load).
Application Scenarios
This switch is designed for demanding applications requiring manual switching or isolation of ultra-high current main circuits, and is a critical component for power control in heavy industrial equipment.
Key Applications: As a main power input disconnect switch or maintenance safety disconnect point for ultra-high power industrial equipment (such as large melting furnaces, heavy rolling mills, large capacity compressor units, and central refrigeration units).
Power Distribution Systems: In power distribution rooms, generator output cabinets, and large UPS input/output cabinets, it serves as a manually operated disconnect switch for 125A main circuits or important feeder circuits, used for safe switching and maintenance isolation.
Direct Control of Large Loads: Used for directly controlling the power on/off of ultra-high power loads such as three-phase motors, heating systems, and electrolytic plating power supplies with a rated current of up to 125A.
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