CHINT NM1LE800S-4300-800A MCCB

This is a CHINT NM1LE series 800A moulded case earth leakage автоматический выключатель with triple protection: перегрузка, короткое замыкание и утечка на землю. It has S-class breaking capacity (36кА при 400 В), 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. Ключевые технические параметры

3. Типичные применения
4. Industrial power distribution systems

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

Control circuits for large motors (например, 400kW induction motors) with full protection

Factories, центры обработки данных, 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

Суровые условия: wet, пыльный, corrosive locations (химический, textile plants)

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

Heavy-duty equipment with frequent starts: краны, компрессоры, to detect insulation failure

4. Сменные модели

4.1 CHINT Upgrades / Замены

4.2 Cross‑Brand Equivalents

5. Выбор & Application Notes
6. Breaking capacity matching

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

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

Мотор & 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. Установка & проводка

Фиксированный монтаж; 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°.

5. Обслуживание & 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

Эта модель: S-class = 36kA@400V

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

2. Текущий рейтинг

Frame current 800A, rated current 800A

For continuous loads ≤800A only; не перегружайте.

3. поляки & System Type

4300 = 4П (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: 30/100/200/300/500мА

Личная безопасность / wet areas: 30мА

Equipment / fire protection: 100–300mA

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

5. Trip Characteristics

Thermomagnetic: перегрузка + instantaneous short-circuit protection

Instantaneous range: 5–10В

Set higher for motors to avoid tripping during startup.

6. Установка & Среда

Must be vertical, tilt ≤15°

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

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

7. Электропроводка & Heat Dissipation

Use 800A-rated conductors:

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

Terminations must be tightly torqued to avoid overheating.

8. Обслуживание & Безопасность

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).