CHINT NXB63-2P/63A two-pole miniature circuit breaker（MCB）

     CHINT NXB63-2P/63A is a two-pole miniature circuit breaker (MCB) specially designed for residential, commercial, and industrial applications, primarily used for overload and short-circuit protection in electrical circuits. The following is a detailed breakdown of its core specifications and purchasing guidelines:  

I. Core Technical Parameters*CHINT Contactor NC1-09*  

1. **Rated Current and Trip Characteristics**  

   - Rated current: 63A, suitable for circuit protection of high-power devices (e.g., air conditioners, water heaters).  

   - Default trip characteristic: **Type C** (suitable for lighting and resistive loads), with **Type D** (suitable for inductive loads like motors) also available. Type D can withstand short-term high inrush currents, making it ideal for protecting power equipment.  

2. **Breaking Capacity and Voltage*Schneider-MCCB-NSX250F-4P-250A*  

   - Breaking capacity: **6kA** (400VAC), compliant with GB/T 10963.1 and IEC 60898-1 standards, effectively interrupting short-circuit currents.  

   - Rated voltage: Supports **230V single-phase** or **400V three-phase** circuits, suitable for various power distribution scenarios.  

3. **Certifications and Safety*Schneider Circuit Breakers Price*  

   - Certified by CCC and CE. The housing is made of high-temperature-resistant materials, with an IP20 protection rating to ensure long-term reliable operation.  

II. Application Scenarios and Installation Guidelines**  

1. **Typical Applications**  

   - **Residential**: As the main switch in distribution boxes or branch protection for high-power appliances (e.g., central air conditioners, instant water heaters).  

   - **Commercial/Industrial**: Used for three-phase motor control, small power equipment, or 380V circuit protection.  

2. **Installation Requirements*Chint's NB1-63DC series DC circuit breakers Price* 

   - Must be vertically mounted on a TH35-7.5mm standard rail. Wiring terminals support 2.5–10mm² conductors, ensuring secure connections.  

   - Power must be disconnected before installation, and operations should be performed by professional electricians. Avoid humid or flammable environments.  

III. Pricing and Purchase Channels**  

1. **Market Prices*CHINT surge protector price*  

   - **Type C**: For single-unit pricing, contact my Whatsapp: 0086-13811255435.  

   - **Type D**: For single-unit pricing, contact my Whatsapp: 0086-13811255435, suitable for motor protection needs.  

2. **Purchase Channels**  

   Contact my Whatsapp: 0086-13811255435.  

IV. Selection and Precautions**  

1. **Selection Recommendations**  

   - **Load Matching**: Calculate current based on equipment power (e.g., 63A supports approximately 14kW single-phase loads) to avoid overload.  

   - **Trip Type**: Choose Type C for lighting/sockets and Type D for motors/compressors to ensure protection characteristics match the load.  

2. **Usage Tips**  

   - Regularly inspect contact status to prevent overheating due to oxidation or looseness.  

   - If tripping occurs frequently, troubleshoot line faults or upgrade the circuit breaker specification; do not adjust trip parameters without authorization.  

V. Accessories and Extended Functions**  

- **Optional Accessories**: Auxiliary contact (AX-X1), alarm contact (AL-X1), shunt trip, etc., enabling remote control or fault alarm.  

- **Compatibility**: Works with NXB series rail sockets and residual current devices (e.g., NXBLE) to build a complete power distribution system.  

CHINT NXB63-2P/63A, with its high reliability and flexible selection, has become the mainstream choice for residential and small-to-medium projects. It is recommended to purchase from official channels to ensure product quality and after-sales service.  

As a highly reliable two-pole MCB, CHINT NXB63-2P/63A flexibly adapts to various high-load scenarios in residential circuits. Below are its core application scenarios and technical logic:  

I. Core Protection for Residential Main Switches**  

**Application Scenarios**:  

- **Multi-appliance Residential Buildings**: In villas, large apartments, or multi-room homes, when devices like air conditioners, floor heating, and ovens operate simultaneously, the total load may approach 40A. The 63A circuit breaker provides a 20%–30% redundancy to avoid frequent tripping due to momentary overloads.  

- **Future Expansion Needs**:预留 space for upgrades like EV charging piles or home energy storage systems, avoiding costs from replacing circuit breakers later. For example, a 7kW charging pile requires 32A current, and a 63A circuit breaker can directly accommodate it without additional modifications.  

Technical Advantages**:  

- **Matching Breaking Capacity**: 6kA breaking capacity handles typical household short-circuit currents (2–4kA), ensuring rapid fault interruption.  

- **Safety Certification Guarantee**: Certified by CCC and CE, with a high-temperature-resistant housing (94V-0 flame retardant grade) and IP20 protection, enabling long-term stable operation.  

II. Precision Protection for High-Power Appliances**  

**Typical Applications**:  

1. **Central Air Conditioning Systems**:  

   - The starting current of a 3HP cabinet unit can reach 10A (220V). The Type C trip characteristic of the 63A circuit breaker (instantaneous trip at 5–10 times rated current) withstands starting surges while providing precise overload protection.  

   - Multi-split systems (e.g., 5HP one-to-four) with a total power of about 12kW (55A) can directly use a 63A circuit breaker as the branch switch.  

2. **Instantaneous Electric Water Heaters**:  

   - An 8.5kW model has an operating current of approximately 38.6A. The 63A circuit breaker provides stable protection, preventing tripping caused by power fluctuations due to water quality changes.  

3. **High-Power Kitchen Equipment**:  

   - When embedded ovens (3.5kW), steamers (2.5kW), and induction cookers (2.2kW) are used simultaneously, the total current is about 37A, which the 63A circuit breaker can cover for peak loads.  

**Selection Logic**:  

- **Load Matching Formula**: Equipment power (W) ÷ voltage (220V) = current (A). The circuit breaker’s rated current should be ≥1.2 times the calculated value. For example, a 14kW single-phase load corresponds to 63.6A, making a 63A circuit breaker compliant.  

III. Professional Adaptation to New Energy Equipment**  

**1. EV Charging Pile Protection**:  

- **AC Slow Charging Scenarios**:  

  - A 7kW charging pile (32A) can directly use a 63A circuit breaker as the main switch, paired with NXBLE series residual current devices (e.g., NXBLE-63-2P) for dual protection.  

  - If the charging pile shares a circuit with other devices (e.g., sockets), the 63A circuit breaker can serve as the main switch, with 20A circuit breakers isolating branch circuits.  

- **DC Fast Charging Scenarios**:  

  - A 21kW DC pile requires a 4P40A residual current device, but a 63A circuit breaker can act as the upper-level main switch to ensure the entire circuit is cut off in case of a fault.  

**2. Home Energy Storage Systems (Including Photovoltaics)**:  

- **AC-Side Protection**:  

  - The output of an energy storage inverter (e.g., 5kW model, 22.7A) requires a 63A circuit breaker to prevent battery backflow or overload.  

  - In grid-connected photovoltaic systems, the AC side of the inverter (e.g., 8kW model, 36.6A) can use a 63A circuit breaker to meet the 1.25-fold overload protection requirement.  

- **DC-Side Coordination**:  

  - The DC side of energy storage batteries requires a dedicated circuit breaker (e.g., NXB-DC series), while the 63A AC circuit breaker can serve as the system main switch for dual AC-DC protection.  

IV. Extended Applications in Special Scenarios**  

**1. Complex Distribution Systems in Villas**:  

- **Multi-Zone Power Supply**:  

  - If a villa uses zoned power distribution (e.g., independent distribution boxes per floor), a 63A circuit breaker can act as the floor main switch, with 20–40A circuit breakers controlling lighting, sockets, etc., in branches.  

- **Equipment Cluster Protection**:  

  - Functional areas like home theaters (amplifiers, projectors) and gyms (treadmills, elliptical machines) with total loads up to 15kW (68A) can use a 63A circuit breaker as the zone main switch, paired with branch protection for hierarchical control.  

**2. Renovations of Old Residential Buildings**:  

- **Circuit Upgrades**:  

  - In homes with original distribution box main switches of 40A, replacing them with 63A circuit breakers when adding instantaneous water heaters, central air conditioners, etc., eliminates the need to replace inlet cables (6mm² copper wires have a safe current-carrying capacity of 48A).  

- **Compatibility Design**:  

  - Using NXB series rail sockets and residual current devices (e.g., NXBLE-63) enables modular power distribution systems, simplifying renovation difficulties.  

V. Safety Configurations and Installation Recommendations**  

1. Coordination with Residual Current Devices**:  

- **Main Switch + Branch RCDs**:  

  - Use a 63A circuit breaker as the main switch, and NXBLE-63-2P (30mA residual current protection) for branch circuits in humid areas like kitchens and bathrooms to achieve hierarchical protection.  

- **Main RCD + Branch MCBs**:  

  - If the main switch uses NXBLE-63-2P (63A/30mA), and branches use 63A circuit breakers, costs can be reduced, but note that the fault排查 scope expands.  

2. Installation Specifications**:  

- **Wiring Requirements**:  

  - Conductor cross-sections must match the load. A 63A circuit breaker is recommended to use 10mm² copper wires (safe current-carrying capacity 65A) to avoid overheating.  

  - Mount vertically on a TH35 rail, with terminal torque reaching 8N·m to prevent loosening.  

- **Environmental Adaptation**:  

  - Distribution boxes must have reserved heat dissipation space (≥30cm from the wall); outdoor installations require IP65 protection grade enclosures.  

3. Maintenance and Inspection**:  

- **Regular Checks**:  

  - Use an infrared thermometer annually to detect contact temperatures (≤60℃) and prevent increased contact resistance due to oxidation.  

- **Function Testing**:  

  - Manually switch on and off quarterly to test mechanical performance, ensuring the trip mechanism is sensitive.  

VI. Typical Configuration Scheme Examples**  

With high reliability and flexible adaptability, CHINT NXB63-2P/63A is an ideal choice for addressing high loads, new energy equipment, and future expansion in residential circuits. Users can select Type C (resistive loads) or Type D (inductive loads) trip characteristics based on actual needs and strictly follow installation specifications to ensure electrical safety.