ZHUCO HZ5B-10/D010.3 Forward, stop, reverse, three-position, three-section combination switch

The HZ5B-10/D010.3 is a 10A rated current, three-position, three-stage, forward-stop-reverse control combination switch. It is specifically designed for direct forward and reverse control of three-phase asynchronous motors, achieving motor direction switching and safe stopping through clear mechanical positioning (left-stop-right) and reliable contact logic. The casing is made of flame-retardant and high-temperature resistant material, and the internal components are thickened copper conductors and silver alloy contacts, ensuring excellent conductivity, arc oxidation resistance, and long service life at a 10A rated current. Its compact and clear structure makes it a preferred component for control panels of machine tools and various small equipment.

1. Main Technical Parameters

Rated Operating Current: 10A

Rated Operating Voltage: AC 380V, 50Hz/60Hz

Contact Configuration and Functional Logic:

Contact Structure: Three sections (three layers), each layer has a set of changeover contacts, allowing switching of three independent circuits.

Positions and Contact States (X indicates ON):

Position "1" (Forward): Contacts 1-2, 5-6, 9-10 are ON. This state typically corresponds to the phase sequence required for the motor to rotate clockwise.

Position "0" (Stop/Neutral): All contacts are completely open. Provides a clear stop position and a safe electrical isolation point for easy maintenance.

Position "2" (Reverse): Contacts 3-4, 7-8, 11-12 are ON. This state switches the corresponding phase, causing the motor to rotate counterclockwise.

Mechanical and Electrical Life (Operating Frequency ≤ 120 times/hour):

Mechanical Life: ≥ 100,000 Electrical Life: AC-23A (resistive load): ≥ 30,000 cycles; AC-3 (direct start, stop, and reverse rotation of squirrel-cage motor): ≥ 30,000 cycles; AC-4 (jogging, reverse braking): ≥ 30,000 cycles
Wiring and Structure:
Wiring Specifications: M4 terminal screws, recommended wire cross-sectional area 1.0 – 1.5 mm², recommended tightening torque 1.2 N·m.

Structure and Materials: Flame-retardant and high-temperature resistant shell, with thickened copper conductors and silver alloy contacts inside to ensure reliable contact and long life.

2. Application Scenarios

This switch is a standard component designed specifically for controlling the forward, reverse, and stop operations of small three-phase motors (≤10A). It is widely used in various equipment that requires changing the motor's rotation direction.

Core Applications: Machine Tool and Equipment Motor Control

Metalworking Machine Tools: As a forward/reverse control switch for the spindle motors of drilling machines, milling machines, lathes, and tapping machines, used to achieve operations such as tapping, tool retraction, and forward/reverse cutting.

Material Conveying Equipment: Controls the running direction of conveyor belts, elevators, and feeding mechanisms, enabling forward, backward, or lifting functions.

Lifting and Hoisting Equipment: Used for the lifting and lowering control of small hoists, winches, and rolling shutters.