CHINT NS2-32H 17-23A AC motor starter

The following are the detailed technical parameters and application guidelines of the CHINT (CHNT) **NS2-32H 17-23A** AC motor starter, compiled by combining official documents and actual scenarios, covering key dimensions such as core functions, electrical performance, control characteristics, and compatibility:Schneider Circuit Breakers Price

I. Core Functions and PositioningChint's NB1-63DC series DC circuit breakers Price

The NS2-32H belongs to a **motor starter**, which is mainly used for **overload, phase failure, and short-circuit protection** of three-phase asynchronous motors and for infrequent starting control. It is suitable for scenarios such as industrial equipment, pumps, and fans. Its core features include:Chint NXR series thermal overload relays price

- **Setting current range of 17-23A**: It is suitable for motors with a power of approximately 3kW (needs to be adjusted according to the actual load).

- **Tripping characteristics**: It complies with the **10A class** of the IEC 60947-2 standard and is suitable for loads with high starting currents (such as fans and water pumps).CHINT contactor price

- **Integrated protection function**: There is no need for an additional thermal relay, simplifying the design of the control cabinet.

 II. Electrical and Mechanical ParametersCHINT surge protector price

1. Electrical Performance

2. Mechanical Specifications

- **Dimensions**: 120×100×80mm (H×W×D), suitable for installation on a standard 35mm rail.

- **Weight**: Approximately 0.8kg.

- **Protection level**: IP20 (needs to be installed in the control cabinet).

- **Installation methods**:Schneider LRD Thermal Relay Price

  - **Front panel wiring**: Connect the main circuit through screws (recommended).

  - **Plug-in installation**: Requires a special base (such as the CC series conversion connector, see).

III. Control and Interface Parameters

 1. Control Functions

- **Manual/Automatic reset**:

  - **Manual reset**: Press the reset button (RST) to restore after tripping.

  - **Automatic reset**: Switch by adjusting the screw (manual reset by default, see).

- **Test function**: Supports simulated overload testing to verify the effectiveness of the protection function.

2. Interface Configuration

 IV. Environment and Certification

- **Operating temperature**: -5°C to +40°C (without derating), and a 20% derating is required from +40°C to +60°C.

- **Altitude**: No derating when ≤ 2000m, and derating is required when exceeding this altitude.

- **Certifications**:

  - **Domestic**: CCC certification (see the certificate number).

  - **International**: CE certification (complying with EN 60947-2), and some models support UL certification (the specific model needs to be confirmed).

V. Typical Applications and Configuration Examples

1. Motor Protection Scenarios

- **Fan control**:

  - **Parameter setting**: Set the setting current = motor nameplate current × 1.1 (considering the starting impact).

  - **Cooperating equipment**: Used in combination with CHINT NXC contactors (such as NXC-32), and simplify the wiring through the CC conversion connector (see).

- **Water pump control**:

  - **Function activation**: Connect to the PLC through the auxiliary contacts to achieve fault alarm.

  - **Special requirements**: If the water pump starts and stops frequently, it is recommended to select the automatic reset mode.

 2. Matching with Frequency Converters

- **Compatibility**:

  - **Current matching**: The output current of the frequency converter needs to be ≤ the setting current of the NS2-32H.

  - **Harmonic processing**: If the frequency converter causes current distortion, the setting current needs to be increased by 1.3-1.9 times (see).

- **Installation suggestions**:

  - **Position**: Install on the output side of the frequency converter, close to the motor.

  - **Interference suppression**: Use twisted-pair wires to connect the control circuit to avoid high-frequency interference.

 VI. Precautions and Selection Suggestions

1. **Selection Key Points**:

   - **Current range**: Select according to the rated current of the motor (17-23A is suitable for a 3kW motor).

   - **Tripping grade**: The 10A class is suitable for loads with long starting times (such as fans). If quick tripping is required, the 10 grade can be selected.

2. **Installation Requirements**:

   - **Heat dissipation space**: Reserve a 50mm gap at the top/bottom to avoid the influence of high temperature on the protection accuracy.

   - **Wiring torque**: Tighten the main circuit terminals to 4N·m to prevent poor contact.

3. **Fault Troubleshooting**:

   - **False tripping**: Check the motor load, whether the wiring is loose, or reduce the starting current.

   - **No tripping**: Test whether the protection function fails and replace the equipment if necessary.

 VII. Accessories and Alternative Solutions

1. Optional Accessories

- **Auxiliary contact module**: AX-6 (1NO + 1NC), used for remote monitoring of the fault status.

- **Conversion connector**: CC-3(NS2), quickly connect the contactor and the starter (see).

- **Waterproof installation box**: Improve the protection level to IP55, suitable for humid environments.

2. Alternative Models

- **Upgrade solution**: If higher breaking capacity is required, the NS2-80H (80A, see) can be selected.

- **Economical choice**: NS2-32 (without auxiliary contacts), with a cost reduction of approximately 30%.

The overload protection action time of the CHINT NS2-32H 17-23A thermal overload relay strictly follows the **10A class tripping curve** of the IEC 60947-2 standard, and the matching of its core parameters with the actual application scenarios is as follows:

I. Core Parameters of the Overload Protection Action Time

According to the IEC 60947-2 standard and CHINT's official technical documents, the action time characteristics of the NS2-32H are as follows:

 II. Dynamic Characteristics in Practical Applications

1. Inverse Time Characteristic

The action time of the NS2-32H has a **non-linear relationship** with the overload current, specifically manifested as:

- **The larger the overload multiple, the shorter the action time**. For example:

  - When the current reaches **2 times the rated value** (34-46A), the action time is approximately **30 seconds**.

  - When the current reaches **3 times the rated value** (51-69A), the action time is shortened to **10 seconds**.

- **Cold start characteristic**: When overloading starts from a cold state, the action time will be slightly longer than that in a hot state (after running for a certain period of time), and the specific difference is approximately **10-15%**.

2. Influence of Ambient Temperature

- **High-temperature environment** (such as +50°C): The action time may be shortened by **20-30%**, and the setting current needs to be appropriately reduced.

- **Low-temperature environment** (such as -5°C): The action time may be extended by **10-15%**, but it does not affect the effectiveness of the protection function.

3. Influence of Wiring and Installation

- **Too thin wires**: An increase in the resistance of the connecting wires will cause the action time to be advanced. It is recommended to use **multi-strand copper wires of 2.5mm² or above**.

- **Poor heat dissipation**: Insufficient installation spacing (such as the top/bottom gap < 50mm) will cause the action time to be shortened, and it is necessary to ensure good ventilation in the control cabinet.

 III. Key Parameter Verification and Testing Methods

1. Manual Testing

- **Simulated overload**: Raise the current to **1.5 times the setting current** (25.5-34.5A) through an external voltage regulator, and observe whether the tripping time is ≤ 2 minutes.

- **Phase failure test**: Disconnect any one-phase power supply and verify whether the tripping time is ≤ **2 seconds** (phase failure protection characteristic).

 2. Tool Verification

- **Clamp ammeter**: Record the overload current waveform in conjunction with an oscilloscope, and confirm that the deviation of the action time from the theoretical value is ≤ **±10%**.

- **Thermal relay tester**: Special equipment such as **CHNT-THR** is recommended, which can accurately simulate the action time under different overload multiples.

 IV. Parameter Matching for Typical Application Scenarios

 V. Precautions and Selection Suggestions

1. **Cooperation with Contactors**:

   - **Recommended model**: CHINT NXC-32 contactor (requires quick installation through the CC conversion connector).

   - **Cooperation key points**: The breaking capacity of the contactor needs to be ≥ the starting current of the motor (usually 6-8 times the rated current).

2. **Alternative Solutions**:

   - **Upgraded model**: If higher accuracy is required, the **NS2-32H + AX-6 auxiliary contact module** (supporting remote transmission of fault signals) can be selected.

   - **Economical choice**: If short-circuit protection is not required, it can be replaced with the **NR2 series thermal relay** (with a cost reduction of approximately 40%).

 VI. Typical Fault Troubleshooting