ZHUCO HZ5B-10/M08.4 Fast/slow speed, three-position, four-section combination switch

The HZ5B-10/M08.4 is a 10A rated current, three-position, four-section positioning combination switch designed for controlling dual-speed, three-phase asynchronous motors. It achieves motor winding switching through a specific logic combination of four layers of contacts, reliably selecting between low-speed and high-speed operation. The middle "0" position provides a clear stop and safety isolation point. The product uses mechanical positioning, with clear positions and precise operating force feedback, making it an ideal choice for economical and reliable dual-speed manual control in machine tools and various equipment.

1. Main Technical Parameters
Rated Operating Current: 10A
Rated Operating Voltage: AC 380V, 50Hz/60Hz
Conventional Heating Current (Ith): 10A
Contact Configuration and Functional Logic:
Contact Structure: Four sections (four layers), with a total of 16 terminals, achieving complex synchronous switching logic through an internal cam.

Gear and Contact Status (as described):

Position "Low Speed ​​(L)": Contacts 1-2, 7-8, 9-10 are closed.

Position "0" (Stop/Neutral): All contacts are fully open, providing safe electrical isolation.

Position "High Speed ​​(H)": Contacts 3-4, 5-6, 11-12, 13-14, 15-16 are closed.

Design Features: The number of closed contact groups differs between high and low speed positions, meeting the typical wiring requirements of dual-speed motors (such as Dahlander connection or dual independent windings). Speed ​​variation is achieved by changing the connection method of the motor windings.

Mechanical and Electrical Life (120 operations/hour):

Mechanical Life: ≥ 100,000 operations
Electrical Life (AC-23A, AC-3, AC-4 usage categories): ≥ 30,000 operations

Wiring and Structure:

Wiring Specifications: M4 terminal screw, recommended wire cross-sectional area 1.0 – 1.5 mm², tightening torque 1.2 N·m.

Structure and Materials: Flame-retardant and high-temperature resistant shell; thickened copper conductors and silver alloy contacts internally ensure reliable contact, excellent conductivity, and long service life.

3. Application Scenarios
This switch is designed for industrial equipment requiring manual switching between two motor operating speeds, especially suitable for traditional mechanical speed control applications.

Core Application: Dual-speed motor control
Metalworking Machine Tools: Used for high- and low-speed switching of spindle motors in lathes, milling machines, drilling machines, etc., to adapt to different machining materials, tool diameters, or process requirements (such as roughing/finishing).

Fans and Pumps: Controls cooling fans, hydraulic station cooling pumps, etc., to operate between "high airflow/flow" and "low airflow/flow" modes, achieving energy saving and noise control.

Material Conveying Systems: Used for switching between "high-speed operation" and "low-speed positioning" modes for conveyor belts, elevators, and other equipment.

General Equipment Dual Power/Mode Selection: Can be used to control the "high" and "low" power levels of electric heating equipment.

Serves as a master selection switch for equipment requiring two operating modes (e.g., "fast/precise," "mode A/mode B"), achieved by switching between different control loops.