ZHUCO SZW26-125/D404.4 1-0-2 Three-position four-section high-current changeover switch

The SZW26-125/D404.4 is a three-position (-ON-0-+ON), four-section (four-layer) rotary transfer switch with a rated current of 125A, designed for the synchronous control of four independent high-current double-throw circuits, and features a reliable intermediate disconnect position.
Core Function:  Through a single handle operation, it switches four loads or power sources between two operating states ("-ON" and "+ON"), or provides complete electrical isolation of all circuits in the "0" position.
Position "-ON": Contact sets 1-2, 5-6, 9-10, 13-14 are connected.
Position "0": All contacts are open, providing a safe isolation point.
Position "+ON": Contact sets 3-4, 7-8, 11-12, 15-16 are connected.
Electrical Parameters: Rated operating voltage AC 440V (50/60Hz), rated insulation voltage 660V, rated current 125A.
Structure and Materials:  Features silver alloy contacts and thickened copper conductors to ensure low contact resistance and high current carrying capacity under high current conditions. The housing is made of flame-retardant, high-temperature resistant, and environmentally friendly materials, and panel markings can be customized.
Environmental Conditions: Operating temperature -25°C to +40°C, altitude ≤2000m, suitable for typical industrial humidity environments.
Mechanical and Electrical Life: Mechanical life ≥300,000 cycles; electrical life ≥60,000 cycles (under rated load, operating frequency ≤120 times/hour).
Application Scenarios:
This switch is suitable for complex industrial systems requiring manual, synchronous switching of multiple high-current (125A level) circuits, making it an ideal component for achieving high-reliability power selection and load control.
Key Application: Used for overall switching between "main/backup" or "operating/testing" modes in two complete equipment systems containing three-phase main power and single-phase control/auxiliary power. Typical application: In the control cabinets of heavy machinery equipment (such as large presses, gantry cranes, and rolling mill production lines), it enables multi-circuit linkage mode switching for main drive, cooling, lubrication, and control power supply.
High-demand applications: Suitable for power distribution and control systems in industries such as power generation, metallurgy, shipbuilding, and heavy industry, serving as a core transfer switch requiring manual operation, high reliability, and clear isolation points.