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The SZW26-20/D303.3BF is a three-position (1-0-2) rotary changeover switch with a rated current of 20A and IP65 high protection rating. Its core feature is the ability to simultaneously switch three independent circuits via a single handle, enabling overall selection and switching of three operating states. The middle "0" position provides safety isolation. This switch is suitable for AC 440V/50-60Hz circuits, with an insulation voltage of up to 690V. Internally, it uses thickened copper components and silver alloy contacts to ensure high reliability and long lifespan at 20A. Its sealed protective housing effectively prevents dust intrusion and low-pressure water spray from any direction, making it suitable for harsh outdoor, humid, or dusty industrial environments. The internal terminal screws are M3, compatible with 1.0-2.5mm² wires. The mechanical life is no less than 100,000 cycles, and the electrical life is no less than 30,000 cycles.
Main Technical Parameters
Electrical Specifications: Rated operating current 20A; Rated operating voltage AC 440V (50/60Hz); Rated insulation voltage 690V.
Contact Configuration: Three-section (layer) structure with a total of 12 terminals. Position "1" connects contacts 1-2, 5-6, and 9-10; Position "0" (middle position) completely disconnects all contacts; Position "2" connects contacts 3-4, 7-8, and 11-12.
Protection Rating: IP65 (dustproof, water-resistant).
Mechanical and Electrical Life: Mechanical life ≥ 100,000 cycles; Electrical life ≥ 30,000 cycles (under rated load, operating frequency ≤ 120 cycles/hour).
Operating Environment: Suitable for general industrial environments with temperatures ranging from -25°C to +40°C and altitudes ≤ 2000m.
Application Scenarios
This switch is specifically designed for industrial equipment requiring centralized and reliable manual switching of multiple interconnected circuits in harsh environments. It is a key component for achieving complex control logic and safe operation.
Outdoor/Harsh Environment Equipment Control: Serves as the master switch for control panels in outdoor water pumps/fans, mobile construction machinery, ship deck equipment, and wet areas of food and pharmaceutical workshops. Its IP65 protection ensures reliable operation under rain, splashes, high humidity, or dusty conditions, and is used for switching between "main system/stop/standby system" or "automatic/isolated/manual" modes.
Three-Phase Motor Integrated Control: Used for manual control of "high speed/stop/low speed" of dual-speed three-phase asynchronous motors, or for controlling "forward/stop/reverse" mode switching of motors with auxiliary circuits such as independent cooling fans, achieving multi-circuit linkage operation.
Industrial Automation Systems: In production lines, test benches, or complex equipment, it serves as an integrated manual operation interface for multi-state selection such as "process A/stop/process B" or "remote/isolated/local," allowing simultaneous switching of main power, control signals, and indicator circuits.
