CHINT NXHB125/2P-40A small-sized isolating switch

CHINT NXHB125/2P-40A is a small-sized isolating switch, which belongs to the CHINT NXHB-125 series. It is mainly used for circuit isolation to ensure maintenance safety and does not have overload or short-circuit protection functions. The following is its detailed information:

Core Parameters

- **Frame Current**: 125A (indicating the maximum current-carrying level of products in this series).

- **Pole Number**: 2P (two-pole design, suitable for single-phase circuits, capable of disconnecting both the live wire and neutral wire simultaneously).

- **Rated Current**: 40A (the maximum current during long-term stable operation).

- **Voltage Specification**: Rated insulation voltage of 500V, rated working voltage of 230V~ (applicable to 1P and 2P models).

- **Breaking Capacity**:

  - **Rated Short-Circuit Making Capacity**: 20 times the rated current (i.e., 800A) for a duration of 0.1 second.

  - **Short-Time Withstand Current**: 12 times the rated current (i.e., 480A) for a duration of 1 second.

Functions and Applications

1. **Main Functions**:  

   It provides obvious electrical isolation to ensure safety during circuit maintenance, and is suitable for control scenarios where infrequent switching on and off is required.

2. **Typical Applications**:  

   - Main switch for power distribution systems in households and small commercial premises.  

   - Isolation control for 40A load circuits such as air conditioners and kitchen appliances.  

   - Used as an infrequently operated isolation device in industrial control circuits.

3. **Performance Features**:  

   - **High Reliability**: Certified by CCC and CE, compliant with the GB/T 14048.3 standard, with a mechanical life of 10,000 operations and an electrical life of 3,000 operations.  

   - **Compact Design**: With a width of only 18mm per pole, it adopts TH35-7.5 type DIN rail mounting, saving space and facilitating maintenance.  

   - **Safe Operation**: Clear switching status indicators (for open and closed positions) and screw-compression wiring (the tightening torque is 2.0N·m for 20A~63A and 3.5N·m for 80A~125A).

Installation and Usage

- **Environmental Requirements**:  

  Operating temperature range of -25°C~+70°C, pollution degree 2, suitable for dry environments without severe vibration.

- **Wiring Specifications**:  

  It is recommended to use single-core copper conductors or equivalent copper bars; the cross-sectional area should be selected according to the actual load to ensure reliable contact.

- **Precautions**:  

  It is only used for isolation purposes and cannot replace the overload/short-circuit protection function of a circuit breaker. If protection function is required, it can be used in combination with CHINT NXB series circuit breakers.

Price and Procurement

- **Market Reference Price**:  

  The unit price ranges from 13.60 RMB (promotional price) to 57.16 RMB, and the specific price varies depending on the sales channel, packaging quantity (e.g., 3 pieces/box, 12 pieces/box) and whether tax is included.

- **Supply Channels**:  

  Procurement can be made via Whatsapp: 0086-13811255435. Some channels offer same-day delivery or preferential policies for orders meeting the minimum purchase amount.

 Alternative Solutions

- **Circuit Breaker Requirement**:  

  If overload/short-circuit protection is needed, the miniature circuit breakers of the CHINT NXB-125 series (e.g., NXB-125/2P D40) can be selected, which have a breaking capacity of 10kA and are suitable for protective power distribution scenarios.

- **Higher Current Requirement**:  

  If a higher frame current is required, isolating switches of the NXHM series (e.g., NXHM-125/2P 125A) can be considered, but it should be noted that they also do not have protection functions.

Summary

NXHB125/2P-40A is a cost-effective isolating switch, suitable for scenarios requiring reliable circuit isolation. Users need to confirm whether the protection function is required according to actual needs, and select an appropriate installation method and procurement channel.