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NM1LE-250S-4300-200A is a moulded case residual current circuit breaker (RCCB/MCCB with earth leakage protection) from CHINT (NM1LE Series).
- Full Model Explanation
NM1LE: Series code
N: CHNT company code
M: Moulded case circuit breaker
1: Design sequence
LE: With earth leakage / residual current protection
250: Frame rating current 250A (maximum frame current for this series)
S: Breaking capacity class (Standard type, ultimate breaking capacity Icu=30kA)
4300: Poles & functions
4: 4 poles (3P+N)
3: Thermal-magnetic trip with overload + short-circuit protection
00: No accessory trips (no undervoltage, no shunt trip)
200A: Rated operational current In=200A (continuous permissible current)
- Key Technical Parameters (NM1LE-250S/4300 200A)
| Item | Value |
| Rated operational voltage Ue | AC 400V/415V (3-phase 4-wire) |
| Rated insulation voltage Ui | 800V |
| Rated impulse withstand voltage Uimp | 8kV |
| Rated frequency | 50Hz |
| Ultimate breaking capacity Icu | 30kA (Type S standard) |
| Service breaking capacity Ics | 15kA |
| Trip characteristic | Thermal-magnetic (distribution type) |
| Rated residual operating current IΔn | 50mA / 100mA / 200mA (3 adjustable steps) |
| Residual operating time | Standard type ≤ 0.1s (time‑delay optional) |
| Number of poles | 4P (Pole N type A: no overcurrent trip, always closed) |
| Mounting | Fixed type (front connection mainly) |
| Applicable standards | GB/T 14048.2, IEC 60947-2 |
- Main Functions
- Overload protection: Thermal trip delays and trips when current exceeds 200A.
- Short-circuit protection: Magnetic trip operates instantly within 30kA short-circuit current.
- Residual current (earth leakage) protection: Detects current imbalance between phase and neutral; trips quickly at set values (50/100/200mA) to prevent electric shock and electrical fires.
- Infrequent switching: Can be used as a main switch for circuits and equipment.
- Typical Applications
3-phase 4-wire distribution systems, industrial equipment, building power distribution, construction temporary power, main circuits in shopping malls and factories, and other occasions requiring earth leakage + overload + short-circuit triple protection.
Complete Technical Data Sheet
CHINT NM1LE-250S/4300 200A
All parameters are from CHINT official catalog and manual, applicable to NM1LE-250S/4300 200A (4-pole moulded case residual current circuit breaker).
- Basic Identification Parameters
| Item | Key Value | Notes |
| Full product name | Moulded case residual current circuit breaker (earth leakage circuit breaker) | Distribution protection type |
| Brand/Series | CHINT / NM1LE Series | Upgraded first generation |
| Full model | NM1LE-250S/4300 200A | Standard front connection, no accessory trips |
| Frame rating current | 250A | Max rated current supported by this frame |
| Rated operational current In | 200A | Long‑term permissible operating current |
| Poles | 4 poles (3P+N) | Pole N has no overcurrent trip, always closed |
| Breaking capacity class | Type S (Standard) | Type H (high breaking) available for same frame |
| Trip type | Thermal-magnetic trip | Long‑time delay overload + instantaneous short‑circuit protection |
| Compliance | GB/T 14048.2, IEC 60947-2 | CCC certified |
- Main Circuit Electrical Parameters
| Item | Key Value | Notes |
| Rated operational voltage Ue | AC 400V/415V | For 3-phase 4-wire systems |
| Rated insulation voltage Ui | 800V | Maximum insulation withstand voltage |
| Rated impulse withstand voltage Uimp | 8kV | Surge & lightning overvoltage capability |
| Rated frequency | 50Hz | For domestic mains power systems |
| Rated ultimate short-circuit breaking capacity Icu (AC400V) | 30kA | Max safe breaking short-circuit current |
| Rated service short-circuit breaking capacity Ics (AC400V) | 15kA | Can continue normal operation after breaking |
| Arc distance | ≤100mm | Max arc flash during short-circuit breaking |
| Connection | Front connection (standard) | Rear connection & plug-in type optional |
| Main terminal torque | 12N·m | For M8×16 terminal screws |
| Recommended copper conductor | ≥70mm² (solid) / 120mm² (stranded) | Copper busbar / cable recommended |
- Protection Characteristics
| Item | Key Value | Notes |
| Overload protection (thermal trip) | Non-tripping at 7.2In; trips within 1h at 1.3In | Reference temp +30°C, inverse time delay |
| Short-circuit protection (magnetic trip) | Instantaneous setting 12In (2400A) | Distribution type, reliable at 120% setting |
| Protection functions | Overload, short-circuit, residual current (earth leakage) | Can be used for infrequent circuit switching |
| Inlet/outlet | Top inlet, bottom outlet (standard) | Reverse connection strictly prohibited |
- Earth Leakage Protection Parameters
| Item | Key Value | Notes |
| Rated residual operating current IΔn | 50mA / 100mA / 200mA, 3 adjustable steps | DIP switch on device |
| Rated residual non-operating current IΔn0 | 0.5×IΔn | Threshold to avoid nuisance tripping |
| Residual operating time (standard) | ≤0.1s (fast type) | Trips within 100ms on earth fault |
| Earth leakage type | AC type | Reliable for sinusoidal AC residual current |
| Test circuit | Built-in test circuit | With test button; test at least monthly |
| Earth fault indication | Red mechanical indicator | Pops out after earth leakage trip |
- Environmental & Mechanical Parameters
| Item | Key Value | Notes |
| Operating ambient temperature | -5℃ ~ +40℃ | Derate required beyond this range |
| Storage temperature | -25℃ ~ +70℃ | Non-energized storage |
| Altitude | ≤2000m | Derate for higher altitude |
| Pollution degree | 3 | Suitable for industrial distribution |
| Installation category | III | For distribution circuits and main equipment circuits |
| Ingress protection | IP30 (except terminals) | Solid foreign object protection, not waterproof |
| Mechanical endurance | 10,000 operations | No-load operating cycles |
| Electrical endurance | 4,000 operations | At rated load |
| Mounting orientation | Vertical or horizontal mounting allowed | Inverted mounting not permitted |
- Dimensions (4-pole, unit: mm)
| Dimension | Value | Notes |
| Width W | 188 | Total width of 4-pole unit |
| Height L | 165 | Including terminals |
| Depth H | 102 | Body thickness |
| Horizontal mounting hole spacing | 140 | Center-to-center left-right |
| Vertical mounting hole spacing | 126 | Center-to-center up-down |
| Mounting hole diameter Ød | 4.5 | For M4 mounting screws |
| Minimum clearance | ≥25mm side, ≥5mm top/bottom | For side-by-side installation |
Alternative Models from Other Brands
All below match the core specification:
4 poles (3P+N), 250A frame, 200A rated current, Icu ≥30kA at AC400V, thermal-magnetic overload + short-circuit protection, AC-type earth leakage (50/100/200mA adjustable), no accessory trips, front fixed connection.
- Domestic High-Compatible Alternatives
(Dimensions, price, function highly matched; ideal for direct replacement)
Brand Replacement Model Key Matching Parameters Description DELIXI CDM1LE-250/4300 200A Icu=30kA, 4P 200A, 50/100/200mA adjustable, thermal-magnetic 1:1 design with NM1LE, high compatibility, no cabinet modification DELIXI CDM3LS-250S/4300A 200A Icu=35kA, 4P 200A, adjustable leakage, thermal-magnetic New upgraded series, higher performance TENGEN TGM1LE-250/4300 200A Icu=30kA, 4P 200A, 50/100/200mA adjustable Directly compatible with NM1LE Changshu Switch CM1L-250/4300 200A Icu=35kA, 4P 200A, adjustable leakage Industrial rade high reliability NADER NDM1L-250/4300 200A Icu=35kA, 4P 200A, adjustable leakage Stable for construction & industry HUYU HUM1LE-250/4300 200A Icu=30kA, 4P 200A, 3-step leakage Cost-effective direct replacement Joint-venture / International Brands
(Higher performance for premium projects & severe conditions)
| Brand | Replacement Model | Key Matching Parameters | Description |
| Schneider | EZD250E4200ELN (integrated leakage) | Icu=36kA, 4P 200A, 30/100/300mA adjustable | Economic universal type |
| Schneider | NSX250N 4P 200A TM200D + Vigi NSX 250 | Icu=50kA, 4P 200A, multi‑range leakage | High‑end industrial grade |
| ABB | A2C250 TMF200/2000 4P integrated leakage | Icu=36kA, 4P 200A, adjustable leakage | Economic building distribution |
| ABB | Tmax T2N250 TMD200/2000 4P + RC221 | Icu=36kA, 4P 200A, multi‑range leakage | Heavy industrial & foreign projects |
| Siemens | 3VM1250-4ED32-0AA0 | Icu=36kA, 4P 200A, 30/100/300mA adjustable | Standard international type |
| Mitsubishi | NV250-SV 4P 200A | Icu=36kA, 4P 200A, 100/200/500mA adjustable | High reliability for precision equipment |
- Key Replacement Notes
- Mounting dimension check: Domestic models (CDM1LE, TGM1LE, etc.) are highly compatible with NM1LE for direct replacement. International brands often differ in size and hole spacing.
- Minimum breaking capacity: Icu at AC400V must be ≥30kA to ensure safety.
- Leakage matching: Prefer 50/100/200mA adjustable; use fast‑acting type ≤0.1s, not time‑delay.
- Poles & N-pole characteristic: Must be 4P (3P+N), with N-pole without overcurrent trip, always closed.
- Compliance: All replacements must be CCC certified and comply with GB/T 14048.2 / IEC 60947-2.
