ZHUCO SZW26-20/B505.5 ON-OFF-ON Three-position five-section Self-resetting Changeover Switch

The SZW26-20/B505.5 three-position, five-section automatic reset changeover switch is a three-position, five-section automatic reset type changeover switch with an operating mode of "-ON – OFF – +ON". It has a rated current of 20A and is suitable for circuits with AC 50/60Hz, a rated operating voltage of ≤440V, and an insulation voltage of 690V.
Core Functions and Features:
Multi-point instantaneous linkage and automatic reset: When the handle is rotated to the "-ON" position, five sets of circuits are simultaneously connected (1-2, 5-6, 9-10, 13-14, 17-18); when rotated to the "+ON" position, another five sets of circuits are simultaneously connected (3-4, 7-8, 11-12, 15-16, 19-20). After releasing the handle, the switch automatically resets to the middle "OFF" position, and all circuits are simultaneously disconnected.
Structure and Materials:  It features a flame-retardant casing and is equipped with silver alloy contacts and thickened copper conductors internally, ensuring conductive stability, low contact resistance, and a long service life under frequent instantaneous operation.
Life Indicators: Mechanical life ≥ 10⁵ cycles, electrical life ≥ 3×10⁴ cycles (operating frequency 120 times/hour).
Operating Environment: Ambient temperature -25℃ ~ +40℃, altitude ≤ 2000m, humidity ≤ 50% (40℃) / ≤ 90% (20℃), protection required in condensing environments.
Main Application Scenarios:
Suitable for safety and debugging applications requiring multi-point synchronous instantaneous control and automatic reset after operation, typically used in:
Multi-point linkage debugging of industrial equipment: Such as synchronous jogging, stepping, or synchronous testing of multiple actuators on a production line.
Multi-channel signal/power selection and testing: Used in test benches or control cabinets for quick and temporary switching of multiple signal sources or auxiliary power supplies.
Safety interlocking and emergency operation: Used as a manual trigger device in interlocking systems that require simultaneous control of multiple safety circuits and automatic reset after operation.
Function switching of complex equipment: Suitable for automated control systems that require simultaneous switching of multiple sets of contacts to achieve work mode or load group switching.