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Chint 800A 4‑Pole 50kA MCCB Model NM8‑800S‑4P‑800A Nigeria


Technical Specifications

ParameterDetails
Product TypeMolded Case Circuit Breaker (MCCB)
Model SeriesNM8 or NXM Series
Rated Current (In)800 A
Number of Poles4 Pole (3P + N)
Rated Operational Voltage (Ue)Up to 690 V AC (50/60 Hz) / 1000 V DC (selected models)
Rated Insulation Voltage (Ui)1000 V
Rated Impulse Voltage (Uimp)8 kV
Breaking Capacity (Icu/Ics)50 kA at 415 V AC (Icu = Ics)
Trip Unit TypeThermal-Magnetic (fixed or adjustable)
Adjustable Overload ProtectionTypically 0.8–1 × In (adjustable on some variants)
Adjustable Short-Circuit Trip5–10 × In (model dependent)
Utilization CategoryA (Standard MCCB category per IEC 60947-2)
Standard ComplianceIEC/EN 60947-2
Mounting OptionsFixed mounting (front/rear), vertical or horizontal orientation
Electrical EnduranceUp to 5,000 operations (under rated conditions)
Mechanical EnduranceUp to 10,000 operations
Neutral PoleProtected or unprotected (selectable in 4P versions)
Auxiliary AccessoriesSupport for: auxiliary contacts, alarm contacts, under-voltage & shunt trips
Operating Temperature−5°C to +40°C
Ingress Protection (IP)IP20 (with terminal cover)

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The Chint 50 kA, 4‑Pole, 800 A MCCB (model NM8‑800S‑4P‑800A) is a heavy-duty molded-case circuit breaker ideal for industrial and commercial power systems.

Key Features & Specifications
Rated Current: 800 A, four-pole configuration
Breaking Capacity: Up to 50 kA (Icu/Ics), ensuring high short-circuit protection
Type: Thermal‑magnetic trip unit with adjustable thermal-magnetic protection
Voltage Ratings: Suitable for AC circuits up to 690 V and DC systems up to 1 000 V
Standards Compliance: IEC/EN 60947–2 for performance and safety

Functional Highlights
Dual protection: Safeguards against overloads and short circuits
Neutral pole protection: Available in 4-pole variants with adjustable N-pole settings
Modular design: Supports accessories such as auxiliary/alarm contacts, shunt and under-voltage releases, and motorized operations
Versatile mounting: Compatible with vertical/horizontal DIN‑rail or panel installations; standard front/rear/fixed mounting options available

Suitable Applications
Power distribution in commercial, industrial, and infrastructure settings
Motor and machinery protection, ensuring safe equipment start-up and operation
Backup and control panels, integrating advanced trip and signaling accessories

This 4-pole, 800 A MCCB with 50 kA breaking capacity is built for reliability, flexibility, and compliance in demanding electrical environments. Let me know if you’d like to compare it with other frames or review pricing and availability in Nigeria!

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