CHINT NM1LE800S-4300-800A MCCB

This is a CHINT NM1LE series 800A moulded case earth leakage cortacircuitos with triple protection: sobrecarga, 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.

1. Full Model Code Breakdown

2. Parámetros técnicos clave

3. Aplicaciones típicas
4. Industrial power distribution systems

Main or sub-switch for three-phase four-wire 800A high-current circuits

Control circuits for large motors (p.ej., 400kW induction motors) with full protection

Factories, centros de datos, mines requiring personal safety protection

2. 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

3. Special safety applications

Ambientes hostiles: wet, polvoriento, corrosive locations (chemical, textile plants)

Locations requiring high-level fire protection: warehouses, power distribution rooms

Heavy-duty equipment with frequent starts: grúas, compresores, to detect insulation failure

4. Modelos de reemplazo

4.1 CHINT Upgrades / Replacements

4.2 Cross‑Brand Equivalents

5. Selección & Application Notes
6. Breaking capacity matching

Ensure short-circuit current ≤ 36kA@400V; otherwise use NM1LE800H (50el).

S-class breaking capacity decreases at higher voltages; recheck for 690V systems.

2. 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.

3. 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”.

4. Instalación & wiring

Fixed mounting; allow ≥180mm depth for heat dissipation.

Use copper busbar/cable rated for 800A: ≥240mm² cable or 40×10mm busbar recommended.

Debe instalarse verticalmente, tilt ≤15°.

5. Mantenimiento & 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

1. Breaking Capacity Check

This model: S-class = 36kA@400V

If short-circuit current >36el (near transformer, main incomer), use NM1LE800H (50el).

2. Current Rating

Frame current 800A, rated current 800A

For continuous loads ≤800A only; do not overload.

3. polacos & Tipo de sistema

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.

4. Earth Leakage Selection

Available settings: 30/100/200/300/500mamá

Personal safety / wet areas: 30mamá

Equipment / fire protection: 100–300mA

motores / high-power loads: 300–500mA (prevents startup nuisance tripping)

5. Trip Characteristics

Thermomagnetic: sobrecarga + instantaneous short-circuit protection

Instantaneous range: 5–10In

Set higher for motors to avoid tripping during startup.

6. Instalación & Environment

Must be vertical, tilt ≤15°

Ambient: -5℃ a +40℃; derate at high temperature

IP20 open type; install in enclosure for dusty, wet or oily areas.

7. Alambrado & Heat Dissipation

Use 800A-rated conductors:

≥240mm² copper cable or 40×10mm copper busbar

Terminations must be tightly torqued to avoid overheating.

8. Mantenimiento & Seguridad

Press TEST button monthly to verify leakage function.

Leakage module replaceable separately.

Not recommended for three-phase three-wire systems without neutral.

9. Upgrade Recommendation

New CHINT NXMLE800S series: better performance, smaller size

Preferred for replacement or upgrade (dimensions nearly compatible).