Chint NB1-63H/2PC40 Miniature Circuit Breaker

Model Parameter Interpretation

2. Core Technical Parameters

Rated Voltage: 230/400V AC (2P), suitable for 220V single-phase and 380V three-phase systems.

Rated Current: 40あ, capable of stably carrying 40A current for long periods.

Breaking Capacity: 10の (10,000あ), capable of safely interrupting short-circuit currents up to 10,000A.

Tripping Characteristic: C-type, providing reliable protection for conventional loads and avoiding nuisance tripping caused by inrush currents of motors and similar equipment.

Rated Frequency: 50/60Hz

Mechanical Life: Approximately 20,000 operations; Electrical Life: Approximately 10,000 operations.

Protection Class: IP20, preventing the intrusion of solid foreign objects larger than 12mm.

3. Structural and Functional Features
4. Advantages of 2-Pole Design

– Disconnects both live wire and neutral wire simultaneously for enhanced safety performance.

– Both poles are equipped with trip units to provide full protection for the circuit.

– Can be used as an isolating switch to facilitate circuit maintenance.

2. High Breaking Capacity

– The 10kA breaking capacity is significantly higher than that of standard models (6の), making it ideal for modern residential and commercial power distribution systems with large short-circuit currents.

– Reliably interrupts sudden short-circuit currents to protect downstream equipment and circuit safety.

3. Thermal-Magnetic Trip Protection

過負荷保護: Uses thermal elements to monitor continuous overcurrents, tripping slowly when the current exceeds the rated value (typically 1.13–1.45 times the rated current).

Short-Circuit Protection: Uses electromagnetic elements to detect instantaneous high currents, tripping rapidly when the current reaches 5–10 times the rated current (C-type characteristic).

4. アプリケーションシナリオ
5. Residential Power Distribution

– Circuits for high-power electrical appliances in kitchens, bathrooms, 等. (40A can support a load of approximately 8.8kW).

– Protection for individual high-power equipment such as air conditioners and water heaters.

– Floor or unit main switches, protecting both live wire and neutral wire simultaneously.

2. Commercial and Light Industry

– Power distribution systems for small offices and shops.

– Distribution boxes for small production lines and equipment.

– Power supply for medical and precision instruments requiring high safety standards.

3. Special Applications

– Smart home systems with high requirements for circuit protection.

– Temporary power supply sites such as construction sites and exhibitions.

5. Selection and Usage Recommendations
6. Current Matching

– The load current should not exceed the rated current (40あ). It is recommended to reserve a 20% margin, つまり, the long-term operating current should not exceed 32A.

– Power calculation: For a 220V single-phase system, the maximum load is approximately 8.8kW (40A × 220V).

2. Pole Number Selection

– 2P is suitable for scenarios requiring simultaneous disconnection of live wire and neutral wire, offering higher safety than 1P.

– 2P occupies 2 module spaces (36mm), so it is necessary to check if the distribution box has sufficient space.

3. Tripping Characteristic Selection

C-type: Standard type, suitable for conventional loads such as lighting, sockets, and household appliances.

D-type: Designed for loads with high inrush currents such as motors (instantaneous tripping current is 10–20 times the rated current).

The Chint NB1-63H/2PC40 is a high-performance 2-pole miniature circuit breaker with 10kA high breaking capacity and C-type tripping characteristic, specifically designed for modern residential and commercial power distribution systems. The 2-pole structure protects both live wire and neutral wire simultaneously, and the 40A rated current can meet the power demand of most households and small commercial establishments, making it a safe and reliable choice for circuit protection.

Comparison Between Chint NB1-63H/2PC40 and NXB63H-1P/16A Circuit Breakers

1. Core Parameter Comparison

2. Structural and Functional Differences
3. Pole Number Difference (Most Significant Distinction)

NB1-63H/2PC40: 2-pole design, both poles are equipped with trip units, controlling and protecting both live wire and neutral wire simultaneously.

NXB63H-1P/16A: 1-pole design, only controls the live wire; the neutral wire is connected directly without passing through the circuit breaker.

2. Protection Scope

Advantages of 2P:

Disconnects both live wire and neutral wire simultaneously to ensure maintenance safety.

Trips when abnormal current is detected in the neutral wire.

Suitable for circuits requiring complete isolation.

Features of 1P:

Compact size, ideal for distribution boxes with limited space.

Lower price for better cost-effectiveness.

Only protects the live wire; the neutral wire may remain energized in case of faults.

3. Current and Power Carrying Capacity

40あ (2P): Suitable for high-power electrical appliances, のような:

Main kitchen circuits (induction cookers, microwave ovens, 等).

Air conditioners (above 3 HP), electric water heaters.

Small commercial electrical equipment.

16あ (1P): Suitable for low-power loads, のような:

Lighting circuits.

Individual standard sockets.

Small household appliances such as televisions and computers.

3. Application Scenario Comparison

Applicable Scenarios for NB1-63H/2PC40:

1. Main switches or branch main circuits in residential distribution boxes.
2. Areas with concentrated electrical appliances such as kitchens and bathrooms.
3. Dedicated circuits for high-power equipment such as air conditioners and water heaters.
4. Lighting or small power equipment in commercial premises.
5. Medical equipment or precision instruments requiring high safety standards.

Applicable Scenarios for NXB63H-1P/16A:

1. Household lighting circuits.
2. General socket circuits in individual rooms.
3. Small office equipment (computers, printers, 等).
4. Low-power electrical appliances such as lamps and fans.
5. Temporary power supply sites (construction sites, exhibitions, 等).
6. Selection Recommendations
7. Select Based on Load Power:

Prioritize 16A or higher for loads exceeding 3kW.

Must select 40A or higher for loads exceeding 8kW.

2. Select Based on Safety Requirements:

Choose 2P for humid environments, areas accessible to personnel, or circuits requiring frequent maintenance.

Choose 1P for basic protection needs with limited space.

3. Select Based on Distribution Box Space:

Prioritize 1P for tight spaces; standard distribution boxes can accommodate multiple 1P breakers.

Choose 2P for critical circuits or those requiring simultaneous protection of live and neutral wires, trading some space for higher safety.

5. まとめ

The core differences between the two circuit breakers are as follows:

NB1-63H/2PC40: High-end series + 2-pole + large current, suitable for high-power circuits with high safety requirements.

NXB63H-1P/16A: Cost-effective series + 1-pole + small current, suitable for general low-power circuit protection in households.

Selection advice: Make a comprehensive consideration based on circuit load size, safety requirements, and distribution box space. Do not misuse the breakers (例えば, using 1P for high-power circuits or circuits requiring full protection).