Chint NB1-63/1PC63 miniature circuit breaker (MCB)

Chint NB1-63/1PC63 is a miniature circuit breaker (MCB) with 1 pole (1P), a rated current of 63A, and a Type C tripping curve. It belongs to Chint’s NB1 product series and is suitable for circuits with AC 50Hz and a rated voltage of 230/400V, mainly used for overload and short-circuit protection.

 I.Core Parameters and Functions

 1. Basic Specifications

- Pole Count: 1P (1 pole), controls only the live wire; the neutral wire is connected directly.

- Rated Current: 63A, suitable for high-power load circuits, such as air conditioners and electric water heaters.

- Tripping Curve: Type C, applicable to lighting and general inductive loads. The instantaneous tripping range is 5-10 times the rated current (i.e., 315-630A), which can quickly cut off the circuit in case of a short circuit.

- Breaking Capacity: 6kA, which can effectively cut off the short-circuit current in the line to ensure safety.

- Rated Voltage: 230/400V AC, compatible with single-phase and three-phase systems.

 2. Safety Features

- Complies with standards such as GB/T 10963.1 and IEC 60898-1, and has obtained certifications including CCC and CE, ensuring reliable quality.

- Equipped with overload long-delay protection and short-circuit instantaneous protection functions, which can replace traditional fuses.

- The shell is made of high flame-retardant plastic, providing excellent fire resistance. The terminal blocks are designed with anti-misinsertion features to improve installation safety.

 II. Installation and Application

 1. Installation Method

- Adopts standard TH35-7.5mm DIN rail installation, compatible with common distribution boxes for easy installation.

- The terminal blocks support a maximum 16mm² copper conductor, with a tightening torque of 2.0N·m to ensure a stable connection.

 2. Application Scenarios

- Residential Power Distribution: Can be used as the main incoming circuit breaker or branch protection for high-power appliances (such as air conditioners and ovens).

- Commercial and Industrial Use: Suitable for circuit protection of loads like lighting and small motors, especially in places where the required short-circuit breaking capacity does not exceed 6kA.

 3. Environmental Adaptability

- Temperature Range: -35℃ to +70℃, but derating is required when the ambient temperature exceeds 30℃. For example, when the ambient temperature is 60℃, the rated current needs to be reduced to 53.2A (correction factor: 0.84).

- Altitude Limit: Can be used normally below 2000m altitude; derating is required above 2000m (e.g., at 2500m, the current is reduced to 56.7A with a correction factor of 0.9).

 III. Price and Purchase Recommendations

 1. Market Price

- Referring to quotes from e-commerce platforms and distributors, the unit price of NB1-63/1PC63 is usually between 11-37 RMB, and may drop to around 10 RMB during promotional activities.

- It is recommended to purchase through Chint’s official channel (WhatsApp: 0086-13811255435) to ensure product quality and after-sales service.

 2. Alternative Models

- For higher breaking capacity (e.g., 10kA), the NB1-63H series (such as NB1-63H/1PC63) can be selected.

- For residual current protection function, it can be matched with the NB1LE-63 series residual current operated circuit breakers (such as NB1LE-63 1P+N C63).

 IV. Usage Precautions

 1. Model Selection and Matching

- The rated current should be calculated based on the load power to ensure the circuit breaker capacity is greater than the actual load current. For example, a 63A circuit breaker is suitable for circuits with a maximum power of approximately 14.5kW (230V×63A).

- Avoid using NB1-63/1PC63 in DC circuits; the NB1-63DC series should be selected for DC scenarios.

 2. Installation Specifications

- Power must be cut off before installation, and wiring should be completed by a professional electrician to ensure correct polarity (only controls the live wire).

- Regularly check the status of the circuit breaker. If contact ablation or frequent tripping is found, replace it in a timely manner.

 V. Certification and Technical Support

- Certification Information: Has obtained certifications including CCC, CE, and VDE, complies with international standards, and can be used in most regions around the world.

- Technical Documents: Product manuals, installation guides, and certification certificates can be downloaded from Chint’s official website to obtain detailed parameters and usage instructions.