Chint NXU-IIG Surge Arrester

Name: Chint NXU-IIG Surge Arrester
Brand: CHINT
SKU: 1601244476635

Type:T2
Brand Name:Chint
Place of Origin:China
Model Number:NXU-IIG, NXU-IIG/F
Rated Voltage:275Vac 320Vac 385Vac 440Vac 85Vdc 350Vdc 500Vdc
Max Discharge current:40 A

Poles

SPD Type

Rated Voltage (Uc)

Max Discharge Current (Imax)

SKU: 1601244476635 Category: Chint MCB

The Chint NXU-IIG Surge Arrester is a Surge Protective Device (SPD) designed to protect electrical systems from transient overvoltages caused by lightning strikes or switching surges. With discharge capacity up to 40kA, this SPD provides reliable protection for distribution boards, industrial equipment, communication systems, and sensitive electronics.

Why SPD Protection is Essential

Technical Specifications

SPD Type Selection Guide

Type	Location	Protection Level
Type 1 (Class I/B)	Main distribution board, at service entrance	Protection against direct lightning strikes
Type 2 (Class II/C)	Sub-distribution boards	Protection against indirect strikes and switching surges
Type 3 (Class III/D)	Near sensitive equipment	Fine protection for electronics

Type

Location

Protection Level

Type 1 (Class I/B)

Main distribution board, at service entrance

Protection against direct lightning strikes

Type 2 (Class II/C)

Sub-distribution boards

Protection against indirect strikes and switching surges

Type 3 (Class III/D)

Near sensitive equipment

Fine protection for electronics

FAQs

A: Install Type 1 SPD at the main incoming distribution board (near the main breaker). Type 2 SPD should be installed at sub-distribution boards or downstream panels. For sensitive equipment, add Type 3 protection near the device.

A: The NXU has visual indication (green/red window) showing if protection is active. After major surges, the module may need replacement. Some models have replaceable cartridges for cost-effective maintenance.

Description

Chint NXU-IIG Surge Arrester 20kA 40kA 65kA 100kA 275V 320V 385V 440V 85Vdc 350Vdc 500Vdc 1P 2P 3P 4P CHNT SPD Surge Protector

NXU- Ⅱ G Low-voltage Surge Arrester

(NXU- Ⅱ G/F is with alarm terminal)

General

1 Certificates:international certificates are under proceeding;
2 Number of pole: 1,2,3,4,1P+N,3P+N;
3 Electric ratings: AC (275V 320V 385V 440V), DC (85V 350V 500V)
4 Application:Protect electric system and on-loading electrical apparatus from thunder and instantaneous over-voltage;
5 Standard:IEC/EN 61643-11

Additional information

Weight	0.6 kg
Dimensions	22 × 22 × 22 cm
SPD Type	T2
Rated Voltage (Uc)	275V, 320V, 385V, 440V
Max Discharge Current (Imax)	40kA
Poles	1P, 2P, 3P, 4P

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for Chint NXU-IIG Surge Arrester.

📥

Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.

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2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.

Technical FAQ & Selection Guide

💡 Frequently Asked Technical Questions & Selection Guide

Pure engineering specifications, tripping curve parameters, and electrical selection guidance for panel builders and system designers.

Voltage & Load Sizing

How to verify rated operational voltage, frequency, and load duty cycle?

Verify that the nominal line voltage (AC 230V single-phase or 400V/415V/690V three-phase at 50/60Hz, or DC voltage ratings) falls within the continuous maximum operating limits of the device. Check duty cycle ratings (continuous vs intermittent duty) to ensure thermal stability under full load.

Protection & Environment

What ingress protection (IP Rating) and environmental enclosures are recommended?

For clean indoor electrical rooms, standard IP20 modular DIN-rail housings are recommended. For outdoor, industrial washdown, or dusty environments, mount components inside weatherproof enclosures rated IP65/IP66 with UV-resistant polycarbonate or powder-coated steel enclosures equipped with compression cable glands.

Selectivity & Grading

How to ensure upstream and downstream coordination in power distribution boards?

Ensure proper discrimination by grading current thresholds and tripping time delays: upstream devices should have higher current ratings and intentional short-time delays (Class S), allowing downstream branch MCBs to clear localized faults without blacking out the entire facility.

Installation & Mounting

What mounting rails, busbars, and spatial clearances are required?

Components mount on standard symmetrical 35mm DIN rail (EN 60715 / TH35-7.5) or backplate screw fixings. Maintain recommended top/bottom ventilation gaps (typically 30–50mm) to ensure unrestricted air convection, and use standard pin/fork comb busbars to minimize contact resistance and wiring errors.

Conductor & Torque Sizing

What conductor sizes and terminal tightening torques should be applied?

Select copper or aluminum conductor cross-sections complying with IEC 60364-5-52 current-carrying capacity tables based on continuous load. Always use a calibrated torque screwdriver or torque wrench to tighten terminal screws to the manufacturer-specified torque to prevent hot-spot degradation and loose connections.