CHINT NM1LE800S-4300-800A MCCB

This is a CHINT NM1LE series 800A moulded case earth leakage întrerupător de circuit with triple protection: suprasarcina, scurtcircuit și scurgere la pământ. 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. Parametrii tehnici cheie

3. Aplicații tipice
4. Industrial power distribution systems

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

Control circuits for large motors (de ex., 400kW induction motors) with full protection

Factories, centre de date, mines requiring personal safety protection

2. Constructii sisteme electrice

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

Medii dure: wet, prăfuită, corrosive locations (chimic, textile plants)

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

Heavy-duty equipment with frequent starts: macarale, compresoare, to detect insulation failure

4. Modele de înlocuire

4.1 CHINT Upgrades / Înlocuitori

4.2 Cross‑Brand Equivalents

5. Selecţie & Note de aplicare
6. Potrivirea capacității de rupere

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

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

2. Earth leakage current selection

Personal protection / wet areas: IΔn = 30mA

Echipamente & protectie impotriva incendiilor: 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. Instalare & cablare

Montaj fix; 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. Întreţinere & înlocuire

Test leakage function monthly using the TEST button.

Inspect contacts after short-circuit operation; replace if necessary.

Pentru upgrade-uri, prefer CHINT NXMLE Kunlun Series (dimensiuni compatibile, performanță mai bună).

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 >36cel (near transformer, main incomer), use NM1LE800H (50cel).

2. Evaluare curentă

Frame current 800A, rated current 800A

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

3. Polonii & Tip de sistem

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: 30/100/200/300/500mA

Siguranța personală / wet areas: 30mA

Echipamente / protectie impotriva incendiilor: 100–300mA

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

5. Trip Characteristics

Termomagnetic: suprasarcina + protectie instantanee la scurtcircuit

Instantaneous range: 5-10 in

Set higher for motors to avoid tripping during startup.

6. Instalare & Mediu

Must be vertical, tilt ≤15°

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

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

7. Cablaj & Heat Dissipation

Use 800A-rated conductors:

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

Terminations must be tightly torqued to avoid overheating.

8. Întreţinere & Siguranţă

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: performanță mai bună, dimensiune mai mică

Preferred for replacement or upgrade (dimensions nearly compatible).