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The core differences of CHINT circuit breakers lie in series positioning, breaking capacity, tripping characteristics, pole specifications, expansion functions, application scenarios, and price . Miniature circuit breakers (MCBs) are mainly used for residential applications, while molded – case circuit breakers (MCCBs) and air circuit breakers (ACBs) are preferred for industrial purposes. Selection should match the load requirements and budget constraints.
- Core Series Classification and Positioning
| Series | Type | Core Positioning | Typical Scenarios |
| DZ47 (including DZ47S) | Miniature Circuit Breaker (MCB) | Classic basic model with high cost – effectiveness | Old projects, budget – friendly residential decoration, and small – scale commercial power distribution |
| NXB/NXBLE | Miniature Circuit Breaker/Residual Current Circuit Breaker with Overcurrent Protection (MCB/RCBO) | Upgraded version of DZ47, core model of Kunlun Series | Residential decoration, small – scale projects requiring basic protection and modular expansion |
| NB3/NB6/NBE7 | Miniature Circuit Breaker/Residual Current Circuit Breaker with Overcurrent Protection (MCB/RCBO) (Taiji Series) | High – end for home decoration, balancing appearance and performance | High – end finished residential buildings, smart homes, and home decoration with high safety and appearance requirements |
| NXM | Molded – Case Circuit Breaker (MCCB) | Power distribution and motor protection, medium – capacity | Industrial power distribution, building power distribution, and motor circuits (63A–1600A) |
| NM5 | Molded – Case Circuit Breaker (MCCB) | High – performance MCCB with high breaking capacity and intelligence | New energy projects, large – scale infrastructure, and high – reliability industrial power distribution |
| NA1/NA8 | Air Circuit Breaker (ACB) | Large – capacity main switch with intelligent coordinated control | Main incoming lines of distribution rooms and main circuits of large factories (800A–6300A) |
- Key Technical Parameter Differences (Core Comparison Between Miniature and Molded – Case Circuit Breakers)
- Core Differences of Miniature Circuit Breakers (MCB/RCBO)
| Parameter | DZ47 | NXB | NB6 | NBE7 | NB3 |
| Breaking Capacity | 6kA | 6kA (better arc – extinguishing performance) | 6kA/10kA (high – end models) | 6kA | 6kA |
| Tripping Curve | B/C/D | C/D (higher precision) | C/D (10mA residual current protection optional) | C/D | C/D |
| Pole Configuration | 1P/1P+N/2P/3P/4P | 1P/1P+N/2P/3P/4P | 1P/1P+N/2P/3P/4P | 1P/2P/3P/4P | 1P/1P+N/2P/3P/4P |
| Rated Current | 6A–63A | 6A–63A | 6A–63A | 16A–40A (50/63A not available) | 6A–63A |
| Expansion Functions | Basic | Supports shunt trip, under – voltage trip, and alarm accessories | Supports intelligent accessories and 10mA residual current protection | Basic | Slim design (18mm), appearance – oriented |
| Price | Lowest | Low – medium | Medium – high | Medium (high cost – effectiveness) | Medium |
- Core Differences of Molded – Case Circuit Breakers (MCCB)
| Parameter | NXM | NM5 |
| Rated Current | 63A–1600A | 16A–1000A |
| Ultimate Short – Circuit Breaking Capacity (Icu) | 25kA–50kA | 36kA–70kA |
| Service Short – Circuit Breaking Capacity (Ics) | 50%–100% of Icu | 100% of Icu |
| Accessory Expansion | Regular modularization | Can be equipped with 4 types of accessories, miniaturized design |
| Intelligent Functions | Basic protection | Smart IoT connectivity and remote monitoring |
III. Key Selection Points (By Scenario)
- Residential Decoration Selection
Budget – priority: NBE7 (16A–40A) or NXB, featuring high cost – effectiveness.
Safety – priority: NB6 (10mA residual current protection) or NB3 (slim design), suitable for families with infants and young children and smart homes.
Old house renovation: Direct replacement with DZ47 without modifying the air – conditioning circuit.
| Circuit Breaker Type | Series | Rated Current Range | Breaking Capacity | Core Application | Typical Scenarios |
| Molded – Case Circuit Breaker (MCCB) | NXM, NXMS | 16A–1600A | 25kA–70kA | Protection for power distribution trunk lines and power equipment | Industrial power distribution, large – capacity loads, and generators |
| Air Circuit Breaker (ACB) | NA1, NXA, NA5 | 400A–6300A | 50kA–120kA | Protection for main incoming lines and busbars of power grids | Factory distribution rooms, data centers, and main power distribution of buildings |
- Comparison of Mainstream Miniature Circuit Breaker (MCB) Series (High – frequency for Sales)
MCBs are crucial for end – user selection. The following are the key differences among CHINT’s most commonly used MCB series, which directly affect quotation and customer communication:
| Parameter | NXB (Upgraded Version of DZ47) | NB6 | NBE7 | DZ47 (Classic Model) |
| Breaking Capacity | 10kA | 6kA | 6kA | 6kA |
| Tripping Characteristics | Type B/C/D | Type C/D | Type C/D | Type C/D |
| Pole Configuration | 1P/1P+N/2P/3P/4P | 1P/1P+N/2P/3P/4P | 1P/2P/3P/4P | 1P/2P/3P/4P |
| Rated Current | 6A–125A (including 125G) | 6A–63A | 16A–40A | 6A–63A |
| Expansion Functions | Supports shunt trip, under – voltage trip, and alarm accessories | Basic model with few accessories | Basic model with red – green indicator | No expansion accessories |
| Price Positioning | Mid – range (high cost – effectiveness) | Mid – to high – end (appearance – priority) | Entry – level (lowest price) | Economy – class (being phased out) |
| Selection Suggestion | Mainstream choice for residential and commercial use | High – end home decoration and smart homes | Budget – constrained and small – current branch circuits | Renovation of old projects and temporary power supply |
- Differences in Key Technical Parameters (Frequently Asked by Customers)
- Tripping Characteristics
Type B: Tripping current of 3In–5In, suitable for sensitive electronic equipment such as computers and PLCs.
Type C: Tripping current of 5In–10In, suitable for general loads like lighting and ordinary sockets (mainstream for residential use).
Type D: Tripping current of 10In–20In, suitable for loads with high starting inrush current such as motors, air conditioners, and compressors.
- Pole Selection
1P: Only disconnects the live wire (L), used for low – power branch circuits like lighting, with the lowest cost.
1P+N: Disconnects the live wire and monitors the neutral wire (N), cost – effective and suitable for ordinary sockets.
2P: Disconnects both the live wire and neutral wire simultaneously, highly safe, used for high – power household appliances such as air conditioners and water heaters.
3P/4P: Used for three – phase equipment (e.g., industrial motors and water pumps). 3P disconnects three – phase live wires, and 4P disconnects three – phase live wires plus the neutral wire.
- Breaking Capacity
– Breaking capacity determines whether a circuit can be reliably disconnected during a short – circuit. For residential use, a breaking capacity of over 6kA is recommended; for industrial and commercial applications, over 10kA is advisable to prevent arc faults.
- Quick Selection Guide (For Fast Customer Recommendations)
Regular residential use: NXB Series (10kA breaking capacity, full pole configurations, expandable with accessories, suitable for most residential decoration projects).
Budget – constrained: NBE7 (low price, with status indicators, suitable for small – current branch circuits).
High – end residential decoration: NB6 (elegant appearance, complete specifications, suitable for smart homes and demanding customers).
Industrial power applications: Prioritize NXM molded – case circuit breakers or NA Series air circuit breakers, as their breaking capacity and accessories are better suited for heavy – duty loads.
VII. Core Differences from Competitors (ABB, Schneider)
Price: CHINT’s products are 15%–30% cheaper than ABB and Schneider products of the same specifications, boasting a distinct cost – effectiveness advantage, which is suitable for budget – sensitive customers.
Accessory ecosystem: CHINT’s modular accessories (e.g., shunt trip and under – voltage trip) are more affordable and highly compatible, facilitating quotation combinations.
Breaking capacity: Low – to mid – range MCBs (e.g., DZ47) have a breaking capacity of 6kA, while the mainstream NXB Series reaches 10kA, which is on par with the mid – range series of international brands.
