Данные взяты из официального руководства серии Chint NM1., все единицы указаны в мм, и точность зависит от физического продукта:
- Монтаж ядра и габаритные размеры (3-столб, front wiring, manual operation)
| Параметр | Ценить | Описание |
| Габаритные размеры (Ш×Г×В) | 243×270×448 | Width W=243, Depth D=270, Height H=448 |
| Mounting Hole Spacing | 200 | Center distance between two holes on the mounting plate |
| Mounting Hole Diameter | Φ10 | Suitable for M10 bolts |
| Mounting Plate Thickness | ≥5 | It is recommended to use a mounting plate with a thickness of ≥5mm |
| Arc Flash Distance | ≤100 | Sufficient arc flash space shall be reserved |
| Handle Height | 172 | Height from the top of the handle to the mounting plate |
- Dimensional Differences for Different Wiring Methods
| Способ подключения | Core Dimensional Change | Примечания |
| Front Wiring | Ширина 243, Глубина 270, Высота 448 | Default standard dimension |
| Rear Wiring | Depth increased to about 280 | Matching rear wiring board is required, mounting hole positions remain unchanged |
| Plug-in Type | Depth increased to about 290 | Suitable for plug-in base, mounting hole positions remain unchanged |
III. Key Points for Mounting and Fastening
- Mounting method: Vertical or horizontal mounting is supported; the mounting plate shall be flat and firm to ensure good heat dissipation.
- Tightening torque: M12 bolts for main wiring terminals, the recommended tightening torque is 28N·m to ensure reliable wiring.
- Bus bar adaptation: For a rated current of 800A, it is recommended to use bus bars of ≥240mm² to meet the current-carrying capacity and heat dissipation requirements.
- Space reservation: An arc flash distance of ≥100mm shall be reserved around to avoid potential safety hazards caused by short-circuit electric arcs.
Cross-Brand Model Comparison Table for Chint NM1-800H/3300-800A
The following comparison is based on the core parameter matching of 3-pole, 800Номинальный ток, H-grade breaking capacity (50кА при 400 В), thermomagnetic tripping (combined tripping), no accessories. Data is derived from the official samples of various brands. Please check the detailed technical parameters and mounting dimensions before replacement.
- Corresponding Models of Mainstream International Brands
| с | | | |
| Бренд | Соответствующая модель | Key Parameter Matching | Примечания по замене |
| Шнайдер | NSX800H TMD 800 3П3Д | • 3-pole, 800А | 1. Mounting dimension difference: NSX800 (Width 243mm, Depth 270mm, Height 448mm), consistent with Chint |
| NS800H 3P 800A | • H-grade breaking capacity (50кА при 400 В) | 2. Tripping curve shall match the protection requirements of the original system |
| • TMD thermomagnetic tripping | 3. Совместимость аксессуаров: Interfaces of auxiliary/shunt trip devices are different |
| АББ | Tmax T6N 800/3P 800A | • 3-pole, 800А | 1. Slightly larger mounting depth (about 280mm) |
| T6H 800/3P 800A | • N-grade (50тот)/H-grade (70тот) отключающая способность | 2. Confirm that the tripper type is thermomagnetic (ДВНЧС) |
| • Thermomagnetic tripping unit | 3. Bus bar wiring methods may vary |
| Сименс | 3VT800N-3NF00-800A | • 3-pole, 800А | 1. Overall dimensions: Width 240mm, Depth 265mm, Height 440mm (slightly different) |
| 3VT800H-3NF00-800A | • N-grade (50тот)/H-grade (70тот) отключающая способность | 2. Operating mechanism is different from Chint, need to confirm the mounting space |
| • Thermomagnetic tripping | 3. Protection characteristics shall be consistent with the original system |
| Итон | IZM91H3-U800 | • 3-pole, 800А | 1. Breaking capacity is optional; priority is given to N-grade (50тот) to match Chint H-grade |
| IZM91N3-U800 | • H-grade (70тот)/N-grade (50тот) отключающая способность | 2. Terminals specifications are different, need to adapt to bus bars |
| • Thermomagnetic tripping | |
- Corresponding Models of Well-Known Domestic Brands
| Бренд | Соответствующая модель | Key Parameter Matching | Примечания по замене |
| Переключатель Чаншу | CM1-800H/3300-800A | • 3-pole, 800А | 1. Fully compatible mounting dimensions (same as Chint NM1 series) |
| CM3-800H/3300-800A | • H-grade breaking capacity (50кА при 400 В) | 2. Slight difference in tripper sensitivity, on-site commissioning is required |
| • Thermomagnetic combined tripping | 3. High accessory universality, direct replacement is available |
| ДЕЛИКСИ | CDM3-800H/3300-800A | • 3-pole, 800А | 1. Consistent overall dimensions: Width 243mm, Depth 270mm, Height 448mm |
| CDM3S-800H/3300-800A | • H-grade breaking capacity (50кА при 400 В) | 2. Obvious price advantage and high cost performance |
| • Thermomagnetic tripping | 3. Slight difference in breaking capacity curve from Chint |
| Shanghai People’s SW | RMM1-800H/3300-800A | • 3-pole, 800А | 1. Compatible mounting dimensions |
| • H-grade breaking capacity (50кА при 400 В) | 2. Tripper type is exactly the same as Chint |
| • Thermomagnetic combined tripping | 3. Comprehensive after-sales service network coverage |
| Chint Upgraded Replacement | NXM-800H/3300-800A | • 3-pole, 800А | 1. Upgraded model of NM1 series with improved performance |
| • H-grade breaking capacity (50кА при 400 В) | 2. Fully consistent mounting dimensions for direct replacement |
| • Thermomagnetic tripping | 3. Optimized protection characteristics, more suitable for modern power distribution systems |
III. Core Technical Points for Replacement
- Mandatory Matching Items for Key Parameters
| Параметр | Matching Requirement | Risk of Mismatch |
| Номер полюса | Must be 3P | Single-phase/three-phase unbalance and protection failure |
| Номинальный ток | Must be 800A | Overload protection failure and line overheating |
| Разрывная способность | ≥50kA@400V | Failure to break reliably in case of short-circuit fault, leading to arc accidents |
| Tripper Type | Must be thermomagnetic combined tripping | No overload protection (magnetic tripping only) or mismatched protection characteristics |
| Монтажные размеры | W×D×H≈243×270×448mm | Inability to install or impact on adjacent equipment |
- Этапы замены
- Cut off the power and test for no voltage to ensure safety.
- Remove the original circuit breaker and record the wiring method and phase sequence.
- Install the new circuit breaker and fasten according to the manufacturer’s torque requirements (28N·m for M12 bolts of main terminals).
- Check the tripper settings (long-delay current 800A, instantaneous multiple 10-12 раз).
- Power on for testing and check the closing/opening actions and protection functions.
- Accessory Replacement Suggestions
| Original Accessory | Replacement Solution | Примечания |
| Вспомогательный контакт | Auxiliary contact of the same specification from the corresponding brand | Terminal definitions may be different |
| Shunt Trip Device | Shunt trip device matching the new circuit breaker | Control voltage must be consistent (220 В/380 В переменного тока) |
| Undervoltage Trip Device | Undervoltage trip device of the same brand | Differences in mounting position and interface |
- Supplementary Selection Instructions
- Breaking capacity upgrade: If the system short-circuit current is greater than 50kA, models with H-grade (70тот) breaking capacity can be selected (например, Schneider NSX800H, ABB T6H).
- Intelligent upgrade: Models with communication functions can be considered (например, Schneider NSX800H with Micrologic 5.0) to realize remote monitoring.
- Cost optimization: Domestic brands (Changshu CM3, DELIXI CDM3) are about 60-70% of the price of international brands with equivalent performance.
Контактор,автоматический выключатель,солнечный инвертор,электрический счетчик,солнечные батареи
