The SZW26-63/D303.3 is a three-position (1-0-2), three-section (three-layer) rotary changeover switch with a rated current of 63A. Its core function is to provide manual switching between two independent three-phase power sources or circuits, with the middle "0" position providing safe isolation. This switch utilizes a three-layer contact structure to synchronously operate three-phase circuits. Position "1" connects the first set of three-phase outputs (contacts 1-2, 5-6, 9-10); position "0" is the off position; and position "2" connects the second set of three-phase outputs (contacts 3-4, 7-8, 11-12). The product features silver alloy contacts and thickened copper conductors, with an insulation voltage of up to 690V, suitable for AC 440V/50-60Hz lines. It has a compact structure, intuitive operation, a mechanical life of 300,000 cycles, and an electrical life of 60,000 cycles (under rated load).
Application Scenarios
This switch is specifically designed for industrial power distribution and control applications requiring manual selection, switching, or isolation of high-current three-phase circuits.
Core Application: As a dual-power transfer switch, it provides manual switching between two three-phase incoming power sources (such as mains power and generator, or main and backup lines), ensuring power supply for 63A loads.
Load Switching: Used to control the "one-in-use, one-in-standby" operation mode switching of two high-power three-phase devices (such as motors, heaters, pump sets).
Safety Isolation and Maintenance: In power distribution cabinets, motor control centers, or large equipment, it provides a clear and reliable manual isolation point ("0" position), facilitating equipment inspection and maintenance. Widely used in electrical systems in power generation, mining, heavy industry, and infrastructure.
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