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The HZ5B-10/B005.3 is a three-position, three-section automatic reset combination switch with a rated current of 10A. Its core feature is that the handle automatically resets to the middle stop position (position 0) from both operating positions (position 1 and position 2). This design is suitable for applications requiring instantaneous or inching control, such as short-term forward/reverse starting of motors, equipment debugging, or testing. Operation requires continuous operation of the handle; the contacts automatically disconnect upon release, making operation convenient and safe.
1. Main Technical Parameters
Electrical Parameters:
Rated Operating Current: 10A
Rated Operating Voltage: AC 380V, 50Hz/60Hz
Rated Insulation Voltage: AC 500V
Conventional Free Air Heating Current: 10A
Contact Configuration and Operating Logic:
Contact Structure: Three sections (three layers), each layer with one set of changeover contacts.
Operating Logic:
Position "1": When the handle is rotated to position "1", contacts 1-2, 5-6, and 9-10 are connected. After the handle is released, the automatic spring returns to the middle "0" position, and the above contacts are disconnected.
Position "0" (Middle Position): All contacts are disconnected, the normal stop position.
Position "2": When the handle is rotated to position "2", contacts 3-4, 7-8, and 11-12 are connected. After the handle is released, the automatic spring also returns to the middle "0" position, and the above contacts are disconnected.
Mechanical and Electrical Life:
Mechanical Life: ≥ 100,000 cycles
Electrical Life: AC-23A (Resistive Load): ≥ 30,000 cycles
AC-3 (Direct Start/Stop of Squirrel-Cage Motor): ≥ 30,000 cycles
AC-4 (Inching, Reverse Braking): ≥ 30,000 cycles
Frequency: ≤ 120 cycles/hour
Wiring and Structure:
Wiring Capacity: M4 screw specification, applicable wire cross-sectional area 1.0 – 1.5 mm², recommended tightening torque 1.2 N·m. Structure and Materials: The outer shell is made of flame-retardant and high-temperature resistant material, while the internal components utilize silver alloy contacts and thickened copper parts to ensure reliable contact.
2. Application Scenarios: This switch is specifically designed for industrial and equipment control applications requiring instantaneous or jogging control, with automatic reset after the control action is completed.
Motor Jogging Control:
Core Application: As a jogging control switch for forward and reverse rotation of a three-phase asynchronous motor. Moving it to position "1" jogs the motor forward; moving it to position "2" jogs the motor in reverse; it automatically stops (resets to position "0") after release. Widely used in machine tools, lifting equipment, conveyor belts, assembly lines, and other applications requiring precise positioning.
Equipment Debugging and Testing: Used for equipment debugging, tool setting, calibration, or functional testing to achieve a brief triggering of a specific action. For example, manually controlling cylinder extension/retraction, valve opening/closing, etc. during debugging.
Specific Working Mode Activation: In some equipment, it is used to trigger a short working cycle or mode, such as a cleaning cycle, test pulse, reset signal, etc., automatically stopping after the action is completed.
Limitations to note: Due to its self-resetting characteristic, it is not suitable for use as a main power switch or mode selection switch that needs to remain on. It is mainly used in control circuits to achieve instantaneous signal switching.
