NJVA1 Voltage and Current Protector

Name: CHINT NJVA1 Over/Under Voltage and Current Protector
Brand: CHINT
SKU: NJVA1

Description

Product Overview

Voltage and current monitoring protector with automatic reconnection for AC systems

Main Features

Reliable performance for industrial applications
Compact design for easy installation
Long service life and stable operation
Suitable for various control systems

Technical Specifications

Parameter	Specification
Function	Voltage and current monitoring
Undervoltage	140-200V adjustable
Overvoltage	240-300V adjustable
Overcurrent	1-63A or 10-100A adjustable
Mounting	DIN rail
Application	Power distribution, substations, generator panels

Typical Applications

Industrial automation systems
Control panels and switchgear
HVAC systems
Power distribution systems
Motor control applications

Ordering Support

For detailed ordering information and technical support, please contact our sales team.

Product Catalog

Please refer to the catalog images below for detailed specifications:

Additional information

Rated Voltage	AC 220V, AC 380V
Protection Type	Over-Voltage, Under-Voltage, Over/Under-Voltage

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for CHINT NJVA1 Over/Under Voltage and Current Protector.

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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.