Chint NXB125-2P125A circuit breaker

The Chint NXB125-2P125A サーキットブレーカー is a miniature circuit breaker with superior performance.

Product Appearance

The Chint NXB125-2P125A circuit breaker is rectangular in overall shape, with a white shell and a blue operating handle, featuring a simple and elegant appearance. Its compact size facilitates installation in various distribution boxes.

Main Parameters

Pole Number: 2P, which means it can control the live wire and neutral wire simultaneously, providing protection for both the phase wire and neutral wire in the circuit.

Rated Current: 125あ, indicating that the circuit breaker can operate stably for a long time under the maximum current of 125A, and is suitable for circuits with large load currents.

Rated Voltage: 400VAC, applicable to AC circuits with a rated voltage of 400V and below.

Breaking Capacity: 10の. In case of faults such as short circuits in the circuit, it can break the short-circuit current up to 10kA in a short time, protecting the safety of the circuit and electrical equipment.

Trip Characteristic: There are usually two types, Type C and Type D. Type C trip characteristic is suitable for general loads such as lighting circuits, while Type D is suitable for power circuits and loads with large inrush currents. The Chint NXB125-2P125A circuit breaker is commonly of Type D, which can better cope with the inrush currents generated by motor starting, 等.

Compliance with Standards: It complies with standards such as GB/T 14048.2 and IEC 60947-2, and has obtained certifications including CCC and CE.

Main Functions

This circuit breaker has overload and short-circuit protection functions. When the current in the circuit exceeds the rated current or a short-circuit fault occurs, the circuit breaker will trip automatically to cut off the circuit, preventing electrical equipment from being damaged due to overload or short circuit. その間, it also has an isolation function, which can isolate the circuit from the power supply during circuit maintenance to ensure the safety of maintenance personnel.

Price Information

The price of the Chint NXB125-2P125A circuit breaker varies depending on factors such as purchase channels and quantities. At Chint Electric Mall, the promotional price of the NXB-125 2P 100A circuit breaker is 38.31 CNY per unit, with a market price of 95.76 CNY per unit. On Suning.com, the price of a 54-unit pack of NXB-125 2P 125A circuit breakers is 3735.20 CNY, which is about 69.17 CNY per unit when converted.

(Contact Chint Electric dealer via WhatsApp: 0086-13811255435)

The core purpose of the Chint NXB125-2P125A circuit breaker is to provide dual protection against overload and short circuit for AC circuits, and realize on-off control of the circuit. Combined with its core parameters including “2P pole number (live and neutral double break), 125A large rated current, Type D trip characteristic (impact resistance), and 10kA high breaking capacity”, it is mainly used in the following scenarios, especially suitable for high-power loads and circuits requiring neutral wire protection:

1. Industrial/Commercial Premises: Main Switch or High-Power Branch Protection
2. Main Switch for Small Factories/Workshops

該当するシナリオ: Small machinery processing plants, assembly workshops, warehouses and other places with concentrated loads. It serves as the main power switch of the entire premises, controlling the on-off of all electrical equipment, and protecting the overall circuit from overload (such as excessive current caused by simultaneous startup of equipment) and short-circuit faults.

Core Adaptability Points: The 125A rated current meets the total current demand of multiple machine tools, fans, water pumps and other equipment in the workshop; the 2P design ensures that the phase wire and neutral wire are cut off at the same time, avoiding equipment damage or personal electric shock caused by live neutral wire.

2. High-Power Branch Protection for Commercial Buildings

該当するシナリオ: Branches of central air-conditioning main units, central heating equipment, large ventilation systems, high-power kitchen appliances (such as commercial induction cookers, ovens) in shopping malls, office buildings and hotels.

Core Adaptability Points: Type D trip characteristic can withstand 5-10 times the rated inrush current during equipment startup (such as air-conditioning compressor startup), preventing false tripping; 10kA high breaking capacity can quickly cut off short-circuit current, protecting expensive commercial equipment from damage.

1. Special Protection Switch for High-Power Equipment
2. Motor/Power Equipment Protection

該当するシナリオ: Control and protection of 22-37kW three-phase asynchronous motors (single-phase high-power motors), water pump units, air compressors, conveyor belts and other power equipment.

Core Adaptability Points: Type D trip characteristic is specially designed for power loads, which can withstand the instantaneous inrush current during motor startup. その間, it can trip quickly when the motor is overloaded (such as jamming) or winding short circuit occurs, avoiding motor burnout.

2. Protection of Large HVAC/Refrigeration Equipment

該当するシナリオ: Outdoor units of central air conditioners above 5HP, industrial water chillers, large cold storage compressor units, 等.

Core Adaptability Points: 125A rated current matches the operating current of the equipment; the 2P design takes into account the neutral wire protection of the equipment (some large equipment requires a neutral wire loop); high breaking capacity copes with short-circuit faults in the internal circuit of the equipment.

Ⅲ. Residential Buildings/Villas: Main Switch or High-Power Area Protection

1. Main Power Switch for Large-Sized Residences/Villas

該当するシナリオ: Residences and villas with a building area of more than 150 square meters, or families with dense power loads (such as using more than 3 air conditioners, 2-3 electric water heaters, high-power kitchen appliances at the same time).

Core Adaptability Points: As the incoming main switch, it controls the power consumption of the entire house, and the 125A rated current meets the total load demand of the whole house; the 2P pole number completely cuts off the live and neutral wires, avoiding live neutral wire during maintenance; overload protection prevents line overheating caused by too many electrical equipment, and short-circuit protection copes with short-circuit risks caused by socket and line aging.

2. Branch Switch for High-Power Areas in Residences

該当するシナリオ: Branch control of independent high-power areas such as villa basements (with charging piles, dehumidifiers), attics (with air conditioners, storage equipment), and kitchens (commercial-grade appliances).

Core Adaptability Points: It independently controls high-load areas, avoiding the impact of faults in a certain area on the power supply of the whole house, and accurately protects the lines and equipment in that area.

1. Temporary Power Supply/Construction Sites

該当するシナリオ: Temporary distribution boxes on construction sites, temporary power supplies for outdoor operations (such as engineering lighting, power supply for small machinery), and main switches for power supply of prefabricated house clusters.

Core Adaptability Points: Compact structure and easy installation, suitable for dense arrangement in distribution boxes; 10kA high breaking capacity adapts to the complex power supply environment of construction sites (such as short circuits caused by line wear and humidity); 2P design ensures live and neutral double break for temporary power supply, improving construction safety.

1. New Energy Field: Photovoltaic/Energy Storage System Protection

該当するシナリオ: Distributed photovoltaic power stations (10-20kW household systems), output side of energy storage inverters, new energy charging piles (auxiliary circuits of high-power DC piles).

Core Adaptability Points: 125A rated current matches the output current of photovoltaic inverters (the output current of household photovoltaic systems is usually 30-80A, and 125A leaves sufficient margin); the 2P design takes into account the neutral wire protection of the photovoltaic system (some grid-connected systems require a neutral wire loop); high breaking capacity copes with inverter faults or line short circuits, ensuring the safe operation of the new energy system.

Summary of Core Uses (Simplified Version for Customer Communication)

This circuit breaker is a “protection expert for high-power loads”, which mainly solves the problems of “on-off control of 125A-level high-current circuits + dual protection against overload and short circuit”. It is especially suitable for scenarios that require simultaneous protection of neutral wires and resistance to inrush currents, covering multiple fields such as industry, commerce, residence and new energy. It is a cost-effective choice for engineering power distribution, equipment supporting and home decoration main control.