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The SC-68/B057.4 is a three-position (HI-OFF-LOW) four-section (four-layer) rotary changeover switch designed for manual switching between two operating states and a safety disconnect position. Its function is to simultaneously control eight independent dual-circuit systems, allowing selection between "High Speed/Full Power" (HI) and "Low Speed/Half Power" (LOW) modes, with complete disconnection in the "OFF" position. The product features clear "HI-OFF-LOW" panel markings and a rotary handle indicator, making operation intuitive.
Electrical and Functional Parameters
Rated Electrical Parameters: Rated operating current 20A, rated operating voltage ≤ 600V AC, rated insulation voltage 690V, suitable for AC 50Hz/60Hz. Contact Configuration and Logic (Based on the diagram): The correspondence between handle rotation angle and contact state is as follows: Position "LOW" (handle rotated approximately 45° to the left): Contacts 1-2, 11-12, and 13-14 are closed.
Position "OFF" (handle centered 0°): All contacts are disconnected, in the safety isolation position.
Position "HI" (handle rotated approximately 45° to the right): Contacts 3-4, 7-8, 9-10, 11-12, and 15-16 are closed.
Operating Characteristics: Clear three-position positioning, mechanically held.
Structure, Materials, and Installation
Structure and Materials: Internally, it uses a four-section (layer) blue insulating base, equipped with silver alloy contacts and thickened copper conductors, ensuring low contact resistance, high current carrying capacity, and long electrical life. The outer shell is made of flame-retardant engineering plastic.
Installation Dimensions (Key Data):
Panel Size: 60mm × 60mm.
Mounting Hole Spacing: 36mm × 36mm.
Mounting Hole Diameter: φ5mm.
Applicable Panel Thickness: 1.7 - 5mm.
Appearance and Physical Parameters: Product weight is approximately 0.295kg, standard packaging is 100 pieces/carton.
Application Scenarios
This switch is specifically designed for control circuits requiring manual selection of two different operating modes, speeds, or power paths, and demanding a clearly defined intermediate disconnect position.
Dual-speed motor control: A dedicated manual speed selection switch for dual-speed three-phase asynchronous motors (e.g., Dahlander connection), switching between "HI" (high speed), "LOW" (low speed), and "OFF" (stop) positions.
Equipment power/mode switching: Used to control electric heating equipment, lighting systems, or other loads, switching between full-power operation (HI), half-power/energy-saving operation (LOW), and off (OFF).
Dual power supply/dual circuit selection: A manual selection switch for control circuits, switching between two different control power supplies or signal sources (e.g., automatic/manual, normal/standby), with the intermediate "OFF" position for safety isolation and maintenance.
General industrial control: Widely used in control panels of machine tools, fans, pumps, and automation systems, enabling reliable dual-path selection control.
