ZHUCO SZW26-160/3GS OFF-ON two-position three-section high-current power isolator switch

The SZW26-160/3GS is a heavy-duty, two-position (OFF-ON) rotary power isolator switch with a rated current of up to 160A. Its design features a three-section (three-layer) structure, utilizing six sets of parallel reinforced silver alloy contacts (corresponding to terminals 1-2, 3-4, 5-6, 7-8, 9-10, 11-12) that operate synchronously. This multi-contact parallel architecture evenly distributes the 160A rated current, significantly reducing single-point contact resistance, arc effects, and operating temperature rise, thus ensuring superior current carrying capacity, operational stability, and electrical life under extreme high-current conditions. All contacts are reliably connected in the "ON" position, and complete and safe isolation of all poles is achieved in the "OFF" position. The switch is suitable for AC 440V (50/60Hz) or DC 240V circuits and features heavy-duty thickened copper conductors and a high-strength flame-retardant housing. Mechanical life is ≥300,000 cycles, and electrical life is ≥60,000 cycles (under rated load, operating frequency ≤120 cycles/hour).
Application Scenarios
This switch is a core manually operated component designed for the on-off control and safety isolation of extra-high current main circuits, suitable for heavy industries and critical power facilities with the highest demands for reliability and safety.
Heavy-duty industrial equipment main power switch: Used as the main power input isolator switch or emergency safety disconnect switch for equipment such as large arc furnaces, giant hydraulic presses, heavy-duty rolling mill production lines, and large-capacity DC drive systems.
Critical power distribution and isolation points: In power plants, substations, and large electrolytic/electrochemical plants' auxiliary power cabinets, it serves as a manual isolator switch for 160A-class core feeder circuits or important load circuits, providing reliable electrical isolation during system switching, maintenance, and repair.
Direct control of extra-high power loads: Used for directly operating and controlling the power supply of extra-high power loads such as three-phase asynchronous motor groups, large induction heating systems, and high-power rectifier/inverter devices with a rated current of up to 160A.