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.