MCCB CHINT NM1LE800S-4300-800A

This is a CHINT NM1LE series 800A moulded case earth leakage interruttore automatico with triple protection: sovraccarico, cortocircuito e dispersione a terra. 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. Parametri tecnici chiave

3. Applicazioni tipiche
4. Industrial power distribution systems

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

Control circuits for large motors (per esempio., 400kW induction motors) with full protection

Factories, centri dati, mines requiring personal safety protection

2. Realizzazione impianti elettrici

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

Harsh environments: wet, polveroso, corrosive locations (chimico, textile plants)

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

Heavy-duty equipment with frequent starts: gru, compressori, to detect insulation failure

4. Replacement Models

4.1 CHINT Upgrades / Replacements

4.2 Cross‑Brand Equivalents

5. Selezione & Note applicative
6. Breaking capacity matching

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

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

2. Earth leakage current selection

Personal protection / wet areas: IΔn = 30mA

Attrezzatura & fire protection: IΔn = 100–300mA

Motore & 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. Installazione & cablaggio

Montaggio fisso; allow ≥180mm depth for heat dissipation.

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

Deve essere installato verticalmente, tilt ≤15°.

5. Manutenzione & sostituzione

Test leakage function monthly using the TEST button.

Inspect contacts after short-circuit operation; sostituire se necessario.

For upgrades, prefer CHINT NXMLE Kunlun Series (dimensioni compatibili, 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

Questo modello: S-class = 36kA@400V

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

2. Valutazione attuale

Frame current 800A, rated current 800A

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

3. Poli & 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.

4. Earth Leakage Selection

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

Personal safety / wet areas: 30mA

Attrezzatura / fire protection: 100–300mA

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

5. Caratteristiche del viaggio

Thermomagnetic: sovraccarico + protezione istantanea da cortocircuito

Instantaneous range: 5–10 pollici

Set higher for motors to avoid tripping during startup.

6. Installazione & Ambiente

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. Cablaggio & Dissipazione del calore

Use 800A-rated conductors:

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

Terminations must be tightly torqued to avoid overheating.

8. Manutenzione & Sicurezza

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, dimensione più piccola

Preferred for replacement or upgrade (dimensions nearly compatible).