ZHUCO HZ5B-20/2.AAA 1-0-2 Three-position, two-section combination switch

The HZ5B-20/2.AAA is a three-position (1-0-2) two-section (two-layer) positioning combination switch with a rated current of 20A. It is optimized for industrial equipment such as welding machines that require frequent switching of operating modes. It innovatively features a standard configuration with connecting copper contacts with inserts, greatly simplifying the process of multi-wire parallel connection on-site and improving wiring efficiency and reliability. This makes it a core manual control element for welding machine current/mode switching.

1. Main Technical Parameters

Rated Operating Current: 20A

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

Conventional Free Air Heating Current (Ith): 20A

Contact Configuration and Position Logic (based on wiring "X" indicating ON):

Structure: Two sections (two layers), two sets of contacts per layer.

Position "1": Contacts 1-2 and 3-4 are ON.

Position "0" (Middle Position): All contacts are OFF, in the stop and safety isolation position.

Position “2”: Contacts 5-6 and 7-8 are closed.

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

Mechanical Life: ≥ 100,000 cycles.

Electrical Life (both ≥ 30,000 cycles):

AC-23A (Resistive load, such as heating)

AC-3 (Direct start/stop of squirrel-cage motor)

AC-4 (Inching, reverse braking)

Wiring and Structure (Key Features):

Convenient Wiring Design: Standard configuration includes connecting copper plates with inserts, allowing wires to be connected in parallel to be pre-connected to the copper plate slots before switching the terminals, solving the problem of multiple parallel connections in equipment such as welding machines.

Wiring Specifications: Terminal screw M4, wire range 1.0 – 1.5 mm², tightening torque 1.2 N·m.

2. Application Scenarios
This switch is specifically designed for small to medium power industrial equipment that requires manual switching between two operating parameters or modes.

Core Applications: Welding Machine Control, Welding Current/Mode Switching: Serves as an output current range selector or operating mode selector for manual arc welding machines, TIG welding machines, etc. (e.g., ordinary welding/TIG welding). Different output taps or control circuits are switched using positions "1" and "2".

General Industrial Equipment Control:
Motor Control: Can be used for forward and reverse rotation control (1=forward, 2=reverse, 0=stop) or dual-speed control of small three-phase motors.

Power Supply and Function Selection: Used for switching between two different power supplies, signal sources, or function modes in the equipment. The middle "0" position provides a safety breakpoint.