The SZW26-125/D303.3 is a three-phase power transfer switch. This product is a 125A rated, three-position (1-0-2), three-section (three-layer) rotary transfer switch, specifically designed for switching between two independent sets of high-power three-phase power sources or loads. Its three-layer contact structure synchronously controls the three-phase circuits. In position "1," it connects the first set of three-phase outputs (contacts 1-2, 5-6, 9-10); in position "2," it connects the second set of three-phase outputs (contacts 3-4, 7-8, 11-12); and in the middle "0" position, all contacts are safely disconnected. The product uses silver alloy contacts and thickened copper conductors, with a rated insulation voltage of 660V, suitable for AC 440V/50-60Hz lines. It features a robust and reliable structure. Mechanical life is ≥300,000 cycles, and electrical life is ≥60,000 cycles (under rated load).
It is suitable for critical applications requiring manual switching of high-capacity three-phase circuits. Typical applications include: serving as a 125A dual-power (such as mains power and generator) manual transfer switch; controlling the "main/backup" switching of two high-power three-phase devices (such as motors, heaters); or providing reliable power selection and maintenance isolation points in control cabinets of heavy industrial equipment.
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