CHINT NF2 Series - User Manual

092
Fuses, Travel Switches, Universal Change-over Switches, Connection Terminals
Load Switch
P
-
K
NF2 series load switch (hereinafter referred to as switch), mainly
used in electrical circuits with AC 50Hz or 60Hz, rated working
voltage up to 690V, and rated working current up to 125A，
It can be used to isolate faulty equipment or perform power
outage maintenance. It can be used as the main switch of
machine tools, fans, and pumps, and can also be used as the
start-stop switch of small-capacity motors.
Standards compliant：IEC/EN 60947-3,GB/T 14048.3
3.1 Normal use conditions
3.1.1 Ambient air temperature:-5℃ ~+ 40℃ ,and the average
temperature within 24h does not exceed+35℃ .
3.1.2 Altitude: The altitude of the installation site does not
exceed 2000m.
3.1.3 Humidity: When the highest temperature is+40℃ , the
relative humidity of the air does not exceed 50%, and higher
relative humidity is allowed at lower temperatures, for example,
up to 90% at 20℃ .Special measures should be taken for the
occasional condensation due to temperature changes.
3.1.4 Pollution degree:Level 3.
3.2 Installation conditions
3.2.1 Install in a place where there is no significant shaking,
shock and vibration, and no rain or snow;in a medium without
explosion hazard;where there is no place that is sufficient to
corrode metal and damage insulation (including conductive
dust);
3.2.2 Installation category:Class III.
3.3 Transport and storage conditions
3.3.1The following temperature ranges are suitable for
transportation and storage: between-25℃ and+55℃ .Up to
+70℃ in a short time (24h)
Note: When the above-mentioned normal use, installation,
transportation and storage conditions are exceeded, the user
should reach a special agreement with the company.
1.General
2. Type designation
N F 2 -
N F 2 -
Handle color:R,Grey handle with lock;RY,Red and
yellow knob;B,Black straight handle;BR,Black knob
(with lock)
Installation method:DI，Rail installation;H,Single hole
panel installation;HH,Mechanical combination;
DO,Door lock installation (extension rod);
BO,plastic box
series：3，3P
Conventional free air heating current
Design Number
Load Switch
Enterprise feature code
Number of poles:3,3 poles;1,1 pole
Additional pole type:TS,terminal cover
Product shell frame: 40, 40A and below; 80, 80A and
below; 125, 125A and below
Product number
Supporting installation form:Unmarked,DI/DO/BO;R,H
Auxiliary pole：P1，1NO+1NC；P2，2NO
Product number
Additional pole type:PS,Sync disconnected;PD,Pre-
disconnect;PN,N terminal;PE,Ground wire
Product shell frame:40,40A and below;80,80A and
below;125,125A and below
Product number
Note：4-pole products are realized by means of 3 poles + additional poles.
2.2 Additional pole model and its meaning
2.3 Auxiliary pole model and its meaning
2.4 Terminal cover model and its meaning
2.1 Load switch model and its meaning
NF2
Load Switch
N F 2 -
N F 2 -
3. Normal use and installation conditions

Summary

NF2 Load Switch Overview

1. General

NF2 series load switch: main use, rated voltage, current, function, standards compliance.

2. Type Designation

NF2 load switch type designation and its meaning breakdown, including model, poles, and accessories.

3. Use and Installation Conditions

Normal operating, installation, transport, and storage conditions for NF2 load switches.

4. Technical Data

Main Technical Parameters

Key electrical and mechanical specifications for NF2 load switch models.

HH Mechanical Assembly Parameters

Technical data for the NF2-HH mechanical combination system.

6. Overall and Mounting Dimensions

NF2 Load Switch Dimensions

Outline and installation dimensions for various NF2 load switch models and mounting types.

7. Order Information and Installation

7.1 Pre-installation Checks

Pre-installation checks including nameplate, appearance, and operating performance verification.

7.2 Installation Methods and Precautions

Instructions and precautions for screw, guide rail, and panel installation methods.

7.2.5 Additional Auxiliary Contact;Fourth Pole Installation

Procedure for installing auxiliary contacts and additional poles on the load switch.

8. Maintenance and Storage

8.1 Daily Maintenance

Measures for removing dust, water vapor, and corrosive substances.

8.2 Maintenance During Operation

Checking wiring terminals, moving parts, and fasteners for reliability.

8.3 Maintenance Cycle

Recommendation for monthly checks and maintenance of the load switch.

8.4 Long-term Use and Storage

Proper procedures for disconnecting, storing, and protecting the product.

9. Warranty and Environmental Protection

9.1 Warranty Period

24-month warranty terms and conditions, excluding user-caused damage.

9.2 Environmental Protection

Guidelines for proper disposal of scrapped products and components.

10. Ordering Instructions

10.1 Ordering Information

Required details for placing an order: model, quantity, delivery time, and consignee.

10.2 Order Example

Examples illustrating how to order products including main body, additional poles, and accessories.

11. Accessories Overview

Overview

1. NF2 Load Switch
   1. Function Description
   2. Usage Features
   3. Maintenance Features

NF2 Load Switch

The NF2 series load switch is a versatile electrical component designed for various applications in AC circuits. It serves primarily as a means to isolate faulty equipment or perform power outage maintenance, ensuring safety and operational efficiency. Beyond isolation, it can function as the main switch for machine tools, fans, and pumps, and even as a start-stop switch for small-capacity motors. The design adheres to international standards, including IEC/EN 60947-3 and GB/T 14048.3, ensuring reliability and compliance.

Function Description

The NF2 load switch is engineered for robust performance in electrical systems. Its core function is to provide a reliable means of making and breaking electrical circuits, particularly for isolation purposes. The switch is built with a contact system that employs a double-breakpoint bridge structure, enhancing its breaking capacity and reliability. The operating mechanism utilizes spring energy storage, which ensures that the connection and breaking speeds are independent of the operator's handle speed. This design guarantees consistent and effective circuit interruption, regardless of how quickly the handle is moved.

The switch's modular design allows for various configurations and enhancements. A standard 3-pole body can be combined with additional accessories to create a 6/8-pole load switch or a 3/4-pole transfer switch. Furthermore, the addition of a neutral pole, grounding pole, or auxiliary contacts expands its functional versatility, allowing it to meet diverse system requirements. The wiring method employs a wire frame design, facilitating secure and efficient electrical connections.

Usage Features

The NF2 load switch is designed for ease of installation and operation across a range of environmental conditions.

Installation: The switch offers multiple installation methods to suit different applications:

• Single-hole panel installation (H): For mounting directly onto a panel.
• Mechanical combination (HH): For integrated setups.
• Door lock installation (DO) with extension rod: Allows for external operation through a cabinet door.
• Plastic box installation (BO): For enclosed applications.
• Rail installation (DI): For mounting on standard DIN rails.

The installation process is straightforward. For screw installation, the switch is first confirmed to be in the "off" state. A hole is opened on the mounting plate, and the switch is connected and tightened with screws. For guide rail installation, the guide rail is fixed in the cabinet, and the switch is then installed onto the rail. Panel installation involves assembling the body, installation panel, and installation plate, followed by attaching the nameplate, cover, and handle, and then tightening the screws. Terminal covers and lock installations are also supported, providing additional safety and security.

Environmental Conditions: The NF2 load switch is designed to operate reliably within specified environmental parameters:

• Ambient Air Temperature: Operates between -5°C and +40°C, with a 24-hour average not exceeding +35°C.
• Altitude: Suitable for installation sites not exceeding 2000m.
• Humidity: At +40°C, the relative humidity should not exceed 50%. Higher humidity (up to 90% at +20°C) is permissible at lower temperatures, with special measures for condensation due to temperature changes.
• Pollution Degree: Rated for Level 3 pollution environments.

Physical Installation Requirements: The switch should be installed in a location free from significant shaking, shock, or vibration, and protected from rain or snow. The surrounding medium must not pose an explosion hazard, nor should it contain substances that could corrode metal or damage insulation, including conductive dust. The installation category is Class III.

Transport and Storage: For transportation and storage, the switch can withstand temperatures between -25°C and +55°C, with short-term exposure (24h) up to +70°C. During long-term storage, the product should be disconnected when not in use and stored in a ventilated, dry, non-corrosive gas warehouse, ensuring it is not placed directly on the ground to prevent damage.

Maintenance Features

Maintaining the NF2 load switch is crucial for ensuring its longevity and reliable operation.

Daily Maintenance: Regular daily maintenance involves taking appropriate measures to remove dust, water vapor, conductive dust, and corrosive substances. It is important to note that non-professionals should not disassemble or repair the device.

Maintenance During Operation: During operation, it is essential to frequently check several aspects:

• Wiring Terminals: Confirm that the wiring terminals are in good contact, with no looseness, and that the wire connections are reliable.
• Moving Parts: All moving parts of the product should be checked frequently to ensure they are not stuck and that fasteners are not loosened. This ensures safety and reliability. Any damaged parts should be replaced promptly.

Maintenance Cycle: It is recommended to check and maintain the NF2 load switch once a month to ensure optimal performance and safety.

Warranty and Environmental Protection: The product comes with a 24-month warranty from the date of production, provided it is stored and transported under normal conditions and the packaging and product itself are intact. The warranty does not cover damage from improper use, storage, or maintenance by the user, unauthorized disassembly or assembly, or damage due to force majeure.

In terms of environmental protection, when the product or its components are scrapped, they should be disposed of properly as industrial waste or taken to a recycling station for classification, disassembly, and recycling, in accordance with relevant national regulations.

CHINT NF2 Series Specifications