CHINT NHRT41 Fuse-switch Disconnector

Name: CHINT NHRT41 Fuse-switch Disconnector
Brand: CHINT

Description

CHINT NHRT41 Fuse-switch Disconnector is a robust horizontal fuse-switch solution engineered for demanding low-voltage distribution applications. Featuring advanced arc-protection and dual mounting flexibility, it provides reliable load switching and overcurrent protection for critical infrastructure including substations and feeder pillars.

1. Product Overview

The NHRT41 series is designed for AC 50Hz/60Hz circuits in low-voltage distribution systems. It combines manual load switching capabilities with integrated fuse protection, making it ideal for substations, feeder pillars, and control panels where safe circuit isolation and overcurrent protection are essential. Available in standard (NHRT41-3) and linked-operation (NHRT41-3L) configurations.

2. Main Features

Arc-protected Busbar Shielding: Enhanced safety with integrated arc protection for busbar systems
Fuse Replacement Interlock: Safety mechanism prevents operation during fuse replacement
Voltage Inspection Holes: Allows safe circuit verification without live part contact
Dual Mounting Design: Flexible bolt-fixing or hook-fixing options for easy panel integration
High-grade Materials: Fiberglass-reinforced unsaturated polyester body with silver-coated contacts
Model Variants: NHRT41-3 (independent phase) and NHRT41-3L (three-phase simultaneous operation)

3. Technical and Application Notes

The NHRT41 features a horizontal design optimized for panel mounting. The silver-coated contacts ensure minimal temperature rise and superior conductivity during long-term operation. Installation can be performed using either bolt-fixing for permanent mounting or hook-fixing for quick installation on existing busbar systems without additional modifications. The “L” variant (NHRT41-3L) enables three-phase simultaneous operation, while the standard model allows independent phase control.

4. Typical Applications

Electrical Substations: Primary switching and protection for distribution transformers
Feeder Pillars: Load switching and protection for outdoor distribution networks
Control Panels: Motor control and protection in industrial automation systems
Power Distribution Centers: Main incoming and outgoing circuit protection
Infrastructure Projects: Reliable switching for critical public utilities

5. Ordering Support

Please specify the model variant (NHRT41-3 for independent phase operation or NHRT41-3L for three-phase simultaneous operation), rated current, and mounting preference when ordering. We provide technical consultation for selecting the appropriate configuration for your specific panel or busbar system requirements.

6. Product Catalog

Additional information

NH Size	NH00, NH0, NH1, NH2, NH3
Rated Current	160A, 250A, 400A, 630A
Rated Voltage	AC 690V

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for CHINT NHRT41 Fuse-switch Disconnector.

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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.