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This is a CHINT NM1LE series 800A moulded case earth leakage circuit breaker with triple protection: overload, short-circuit and earth leakage. It has S-class breaking capacity (36kA@400V), 4-pole fixed installation, and adjustable rated residual operating current (30–500mA). It is widely used for personal electric shock protection and earth fault protection in industrial power distribution, high-power motor circuits and building electrical systems.
- Full Model Code Breakdown
| Section | Marking | Description | Technical Note |
| 1 | NM1LE | Product Series | MCCB with earth leakage protection (LE = Leakage) based on CHINT NM1 series |
| 2 | 800 | Frame rated current | Maximum frame current: 800A |
| 3 | S | Breaking capacity class | S-class standard breaking capacity, 36kA@400V, for general distribution |
| 4 | 4300 | Pole number + trip type | 4 poles (3Ph+N), thermomagnetic trip (300 = no undervoltage release) |
| 5 | 800A | Rated current (In) | Continuous operating current: 800A |
- Key Technical Parameters
| Item | Value | Remarks |
| Product type | NM1LE series MCCB with earth leakage protection | Classic CHINT series with international advanced technology |
| Rated insulation voltage (Ui) | 800V | Maximum continuous voltage for insulation parts |
| Rated operating voltage (Ue) | 400V AC (50Hz) | Standard for three-phase four-wire systems |
| Rated impulse withstand voltage (Uimp) | 8kV | Withstand capability against transient high voltage |
| Ultimate breaking capacity (Icu) | 36kA@400V | S-class, suitable for general industrial & commercial use |
| Service breaking capacity (Ics) | 50% Icu | Reusable after fault operation (GB 14048.2 compliant) |
| Rated current (In) | 800A | Maximum continuous current |
| Trip characteristic | Thermomagnetic (inverse time overload + instantaneous short-circuit) | Overload: 0.8–1.0In adjustable; Instantaneous: 5–10In |
| Earth leakage parameters | Rated residual operating current (IΔn): 30/100/200/300/500mA optional | Provides both personal shock protection and earth fault protection |
| Residual non-operating current (IΔn0): 0.5IΔn | ||
| Operating time: ≤0.3s (≤30mA), ≤0.1s (>30mA) | ||
| Poles | 4P (3Ph+N) | N pole for leakage detection only (not for short-circuit breaking except special versions) |
| Mounting type | Fixed | Standard rail or bolt mounting; withdrawable not supported |
| Connection type | Front connection (standard) | Rear or plug-in connection optional |
| Degree of protection | IP30 | IEC 60529, protects against finger and solid foreign objects |
| Ambient temperature | -5℃ to +40℃ | Derate required beyond this range |
| Dimensions (mm) | H×W×D: 360×240×180 | Standard industrial size for panel installation |
| Weight | Approx. 18kg | Includes leakage module; ~3kg heavier than standard NM1 |
- Typical Applications
- Industrial power distribution systems
Main or sub-switch for three-phase four-wire 800A high-current circuits
Control circuits for large motors (e.g., 400kW induction motors) with full protection
Factories, data centers, mines requiring personal safety protection
- Building electrical systems
Main switchboards and emergency power circuits in commercial and high-rise buildings
Public buildings such as hospitals and schools with high safety requirements
Power circuits for HVAC, pump rooms and large equipment to prevent electrical fires
- Special safety applications
Harsh environments: wet, dusty, corrosive locations (chemical, textile plants)
Locations requiring high-level fire protection: warehouses, power distribution rooms
Heavy-duty equipment with frequent starts: cranes, compressors, to detect insulation failure
- Replacement Models
4.1 CHINT Upgrades / Replacements
| Replacement Model | Main Difference | Application |
| NM1LE800H-4300-800A | Breaking capacity upgraded to H-class (50kA@400V) | Systems with high short-circuit current near transformers |
| NM1LE800S-4308-800A | With motorized operator | Remote control, unattended automation systems |
| NXMLE800S-4300-800A | New Kunlun Series, smaller size, improved performance | System upgrades, new installations |
| NM1LE800S-4310-800A | With undervoltage release | Critical circuits requiring undervoltage protection (e.g., fire power) |
4.2 Cross‑Brand Equivalents
| Brand | Model | Key Matching Parameters | Notes |
| ABB | T6N800 PR221DS-LSI+RCD 800 4P | In=800A, Icu=36kA, 4P, earth leakage | Electronic trip + leakage module, higher precision |
| Schneider | NSX800F TM800D+Vigi 4P | In=800A, Icu=36kA, 4P, thermomagnetic + leakage | Identical breaking capacity, reliable Vigi module |
| Siemens | 3VA6880-6EL32-0AA0+3VA9180-0AA00 | In=800A, Icu=36kA, 3P+N, leakage add-on | 3VA series with leakage kit, similar performance |
| Mitsubishi | NF800-CW+leakage module 4P | In=800A, Icu=35kA, 4P, thermomagnetic + leakage | Japanese brand, suitable for Japanese-equipped systems |
- Selection & Application Notes
- Breaking capacity matching
Ensure short-circuit current ≤ 36kA@400V; otherwise use NM1LE800H (50kA).
S-class breaking capacity decreases at higher voltages; recheck for 690V systems.
- Earth leakage current selection
Personal protection / wet areas: IΔn = 30mA
Equipment & fire protection: IΔn = 100–300mA
Motor & high-power loads: IΔn = 300–500mA to avoid nuisance tripping during startup.
- Poles and N‑pole configuration
4-pole for three-phase four-wire systems only; N wire must be connected.
N pole only detects leakage; it does not break short-circuit current (except special versions).
For interruptible N pole, select a special model with “N-pole breaking”.
- Installation & wiring
Fixed mounting; allow ≥180mm depth for heat dissipation.
Use copper busbar/cable rated for 800A: ≥240mm² cable or 40×10mm busbar recommended.
Must be installed vertically, tilt ≤15°.
- Maintenance & replacement
Test leakage function monthly using the TEST button.
Inspect contacts after short-circuit operation; replace if necessary.
For upgrades, prefer CHINT NXMLE Kunlun Series (compatible dimensions, better performance).
Leakage module can be replaced separately.
CHINT NM1LE800S-4300-800A is a reliable 800A earth leakage MCCB with triple protection, standard breaking capacity and 4-pole design, ideal for industrial automation and building electrical systems. Selection should consider short-circuit level, leakage requirements and installation space. For better performance and safety, use higher-breaking versions or the new Kunlun series when applicable.
CHINT NM1LE800S-4300-800A – Key Selection Notes
- Breaking Capacity Check
This model: S-class = 36kA@400V
If short-circuit current >36kA (near transformer, main incomer), use NM1LE800H (50kA).
- Current Rating
Frame current 800A, rated current 800A
For continuous loads ≤800A only; do not overload.
- Poles & System Type
4300 = 4P (3Ph+N) + thermomagnetic trip
For three-phase four-wire (380V+N) systems only; N wire must be connected.
N pole does not break short-circuit current, only for leakage detection.
- Earth Leakage Selection
Available settings: 30/100/200/300/500mA
Personal safety / wet areas: 30mA
Equipment / fire protection: 100–300mA
Motors / high-power loads: 300–500mA (prevents startup nuisance tripping)
- Trip Characteristics
Thermomagnetic: overload + instantaneous short-circuit protection
Instantaneous range: 5–10In
Set higher for motors to avoid tripping during startup.
- Installation & Environment
Must be vertical, tilt ≤15°
Ambient: -5℃ to +40℃; derate at high temperature
IP20 open type; install in enclosure for dusty, wet or oily areas.
- Wiring & Heat Dissipation
Use 800A-rated conductors:
≥240mm² copper cable or 40×10mm copper busbar
Terminations must be tightly torqued to avoid overheating.
- Maintenance & Safety
Press TEST button monthly to verify leakage function.
Leakage module replaceable separately.
Not recommended for three-phase three-wire systems without neutral.
- Upgrade Recommendation
New CHINT NXMLE800S series: better performance, smaller size
Preferred for replacement or upgrade (dimensions nearly compatible).
