Chint Universal Transfer Switch LW5D-16YH3/3

The Chint Universal Transfer Switch LW5D16YH3/3 is a highperformance switch specifically designed for industrial control, suitable for scenarios such as voltage measurement and motor control. The following are its core information and application guidelines:

Model Analysis and Core Parameters
Model Meaning

LW5D: Series code (L transfer switch, W universal, 5 design serial number, D positioning type).

16: Rated thermal current 16A (applicable to AC15/DC13 loads).

YH3/3: Function code (YH voltage measurement, 3 3section contact system, 3 3 operation positions).

Technical ParametersClick on the red text to view the

Rated voltage: AC 380V/DC 220V.

Contact form: 3 independent sections of contacts, supporting threephase voltage switching (such as UAB, UBC, UCA).

Operation angle: Fourposition positioning at 0° (middle position), 90°, 180°, and 270°, and voltage switching is achieved by rotating the handle.

Certification: Complies with GB/T 14048.5 and IEC 6094751 standards, and has passed 3C certification (Certificate number: 2024010305685092).

Typical Application Scenarios
Voltage Measurement

Used to switch the voltmeter in the power distribution cabinet to measure the threephase line voltage (such as UAB, UBC, UCA).

Wiring example

Inlet terminal: Terminals 1, 5, and 9 are connected to the threephase power supply (L1, L2, L3).

Outlet terminal: Terminals 2 and 4 are connected to the voltmeter, and terminals 6 and 10, as well as terminals 8 and 12, are shortcircuited internally through the connection piece.

Motor Control

Supports functions such as forward and reverse rotation and twospeed switching of motors below 5.5kW (the corresponding model needs to be selected, such as LW5D16 5.5N/3).

Wiring key points

Main circuit: Connect the motor power cable to the output terminals of the switch (such as 2/T1, 4/T2, 6/T3).

Control circuit: Achieve motor rotation direction or speed switching through the onoff of contacts.

Special Requirements

Explosionproof and anticorrosion: A customized model (such as LW5D16YH3/3Ex) is required to meet the use in dangerous environments.

Seismic reinforcement: Complies with the GB 50260 seismic code and is suitable for highvibration occasions.

III. Installation and Maintenance

Installation Method

Railmounted: Quickly installed through a 35mm standard rail, saving cabinet space.

Bolt fixation: Use M4 bolts to fix it on the panel to ensure mechanical stability.

Wiring Specifications

Contact layout: Terminals 112 are divided into three groups (14, 58, 912), and each group corresponds to a voltage gear.

Insulation requirements: After wiring, check the insulation resistance (≥10MΩ) to avoid short circuits.

Maintenance Suggestions

Replacement of vulnerable parts: The height of components such as contactor coils and indicator lights is ≤1.8m for easy operation.

Regular inspection: Clean the contacts quarterly to ensure good contact; calibrate the action value of the protection device annually.

Model Selection and Procurement
Model Comparison

Model	Number of Contact Sections	Operation Positions	Typical Applications
LW5D16YH2/2	2 sections	Three positions	Twophase voltage measurement
LW5D16YH3/3	3 sections	Four positions	Threephase voltage measurement
LW5D16 5.5N/3	3 sections	Three positions	Forward and reverse rotation control of motors

Procurement Channels

Ecommerce platforms: Suning.com, JD.com, Alibaba, etc., with a unit price of approximately 2333 yuan (including freight).

Authorized distributors: A business license needs to be provided, and bulk purchases are supported (such as Beijing Chuangxinjie Electromechanical Equipment Co., Ltd.).

Acceptance Key Points

Function test: Manual/automatic opening and closing, and the dualpower supply switching time ≤100ms.

Document verification: It should include circuit diagrams, component lists, a copy of the 3C certification, and the factory test report.

Frequently Asked Questions
How to distinguish between voltage/current transfer switches?

Voltage type (YH): Fewer contact groups (such as 3 sections), used to switch the voltmeter.

Current type (LH): More contact groups (such as 6 sections), used to switch the ammeter.

Can it replace Schneider’s similar products?

It is necessary to confirm the installation dimensions (such as a panel opening of 55×55mm) and contact logic. It is recommended to consult the manufacturer’s technical support.

How to customize the explosionproof type?

It is necessary to communicate with the manufacturer in advance and provide the explosionproof grade (such as Ex d IIB T4 Gb) and installation environment parameters.