Chint Universal Transfer Switch LW5D-16YH3/3

The Chint Universal Transfer Switch **LW5D-16YH3/3** is a high-performance 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:

 I. Model Analysis and Core Parameters

1. **Model Meaning*Schneider Circuit Breakers Price*

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

   - **16**: Rated thermal current **16A** (applicable to AC-15/DC-13 loads).

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

2. **Technical Parameters*Click on the red text to view the latest price list of CHNT circuit breakers for May 2025.*

   - **Rated voltage**: AC 380V/DC 220V.

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

   - **Operation angle**: Four-position 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 60947-5-1** standards, and has passed **3C certification** (Certificate number: 2024010305685092).

 II. Typical Application Scenarios

1. **Voltage Measurement*Chint's NB1-63DC series DC circuit breakers Price*

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

   - **Wiring example*Chint NXR series thermal overload relays price*:

     - Inlet terminal: Terminals 1, 5, and 9 are connected to the three-phase 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 short-circuited internally through the connection piece.

2. **Motor Control*CHINT contactor price*

   - Supports functions such as forward and reverse rotation and two-speed switching of motors below 5.5kW (the corresponding model needs to be selected, such as LW5D-16 5.5N/3).

   - **Wiring key points*CHINT surge protector price*:

     - 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 on-off of contacts.

3. **Special Requirements*Schneider LRD Thermal Relay Price*

   - **Explosion-proof and anti-corrosion**: A customized model (such as LW5D-16YH3/3-Ex) is required to meet the use in dangerous environments.

   - **Seismic reinforcement**: Complies with the GB 50260 seismic code and is suitable for high-vibration occasions.

 III. Installation and Maintenance

1. **Installation Method**

   - **Rail-mounted**: 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.

2. **Wiring Specifications**

   - **Contact layout**: Terminals 1-12 are divided into three groups (1-4, 5-8, 9-12), and each group corresponds to a voltage gear.

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

3. **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.

 IV. Model Selection and Procurement

1. **Model Comparison**

2. **Procurement Channels**

   - **E-commerce platforms**: Suning.com, JD.com, Alibaba, etc., with a unit price of approximately **23-33 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.).

3. **Acceptance Key Points**

   - **Function test**: Manual/automatic opening and closing, and the dual-power supply switching time ≤100ms.

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

 V. Frequently Asked Questions

1. **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.

2. **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.

3. **How to customize the explosion-proof type?**

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

VI. Precautions

- **Load matching**: Avoid long-term overload (such as reducing the capacity of AC-3 load to 11A).

- **Protection level**: The standard type is IP54, and the customized type can be upgraded to IP65 (additional instructions are required).

- **Grounding requirements**: The metal shell needs to be reliably grounded, and the grounding resistance ≤4Ω.

For further technical support, you can contact Chint's official customer service at www.transformerandswitchgear.com or visit the official website to download the **LW5D Series Product Manual**.