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Electric Knife Switch

The Electric Knife Switch is a manually operated low-voltage isolation device designed for infrequent switching of AC (400V/690V) or DC circuits, supporting up to 3000A rated current. Its core components include a moving contact blade, fixed contact block, arc extinguishing chamber, and insulated cover. Compliant with CE and CCC certifications, it ensures physical isolation and basic circuit protection. Ideal for industrial distribution panels, motor control cabinets, emergency shutdown systems, and applications such as small motors (≤3x rated current load) and electric furnace equipment.

Surface Finish: Electroplated
Insulation Resistance: 1000MΩ
Operating Temperature: -20°C to +40°C
Weight: 3-5 kg
Protection Level: IP 20

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High Current Disconnect Switch Arc-Resistant Isolator Switch CE Certified Knife Switch Industrial Manual Disconnector Corrosion-Resistant Electric Isolator

Product Advantages

Technical Parameters

Applications

Operation Guide

Service and Support

Product Advantages

High Current Capacity

Utilizes T2 copper blades with silver-plated contacts, supporting a rated current range from 1000A to 3000A.
Temperature rise: ≤60K under full load.
Contact resistance: ≤100μΩ, ensuring minimal power loss and high conductivity.

Multi-Layer Safety Protection

Dual-layer protection system with an arc extinguishing chamber and insulated cover for enhanced safety during operation.
Arc quenching time: Less than 50ms, ensuring quick and efficient arc suppression.
IP2X protection rating: Prevents accidental contact with live parts, reducing the risk of electric shock.
The design ensures safe operation in high-voltage environments.

Corrosion-Resistant Construction

Base Material: DMC (unsaturated polyester molding compound) ensures a strong and durable foundation.
Housing Material: PA66, offering resistance against both acidic and alkaline gases such as H2S and SO2, making it ideal for industrial environments.
Mechanical lifespan: ≥10,000 operations, guaranteeing long-lasting performance even under challenging conditions.
The switch’s resistance to environmental factors ensures reliable operation in both indoor and outdoor settings.

Flexible Configurations

Single-throw (HD series): For applications requiring simple on/off switching.
Double-throw (HS series): Offers more versatile switching for complex circuits, providing more control options.
Compatible with 2P/3P/4P systems, allowing for easy integration into a variety of electrical setups.
Suitable for voltage ranges from 380V to 690V, meeting the needs of diverse industrial applications, from low to high-voltage operations.

Parameter

Value

Rated Current

10A–3000A (customizable up to 5000A)

Rated Voltage

AC 400V/690V

DC 220V

Poles

2P

3P

4P

Material

Blades: T2 Copper; Base: DMC+PA66

Operation

Manual lever mechanism

Protection Rating

IP2X (operating face)

Mechanical Lifespan

≥10

000 cycles

Certifications

CE

CCC

IEC 60947-3

Applications

Industrial Power Isolation:

Serves as the primary manual disconnect for maintenance circuits, such as in rolling mill control cabinets.
Ensures safe power isolation during maintenance, reducing downtime and ensuring operator safety.
Ideal for use in heavy-duty industrial environments with high power requirements.

Motor Emergency Shutdown:

The HS series is designed for backup power switching, providing seamless integration with motor control systems.
Ensures continuous production by enabling quick and reliable switching in the event of a power failure.
Prevents damage to motors and associated equipment, maintaining operational efficiency.

Furnace Control:

Directly switches resistive loads (≤ rated current), minimizing wear on circuit breakers and enhancing the overall lifespan of the system.
Ideal for use in high-temperature environments, such as furnaces, where manual isolation is critical for safety and system integrity.
Provides a reliable solution for managing power to critical furnace components.

PV DC Isolation:

Custom DC models designed for solar array maintenance, capable of handling DC 1000V and up to 200A.
Ensures safe isolation during maintenance activities in photovoltaic systems, protecting both equipment and technicians.
Essential for solar power systems, offering reliable performance in renewable energy applications.

Operation Guide

1. Installation

- Mount vertically on panels with fixed contacts (power source) above and moving contacts (load) below. Horizontal mounting prohibited.

- Busbar torque: 80N·m for 1000A models (use lock washers).

2. Operation

- Close: Grip handle and push steadily to ON until full blade engagement.

- Open: De-energize load first, then swiftly pull handle to OFF to enhance arc extinction via airflow.

Service and Support

After-Sales Support: Hangzhou Liyi Electrical Equipment Co., Ltd. provides online technical support for troubleshooting, installation, and maintenance. The support team is available to assist with setup and operational issues. Remote diagnostics are offered, and on-site support can be arranged if needed.
Warranty: The Electric Knife Switch comes with a one-year warranty covering defects in materials or workmanship. If issues occur, the company offers free replacement or repair. Extended warranty options are also available for additional peace of mind.
Customization: The Electric Knife Switch can be customized with different voltage and current ratings to fit specific needs. It is also adaptable for harsh environments, including high temperatures and corrosive conditions. Custom branding and labeling options are available for businesses.

At Hangzhou Liyi Electrical Equipment Co., Ltd., we are committed to providing exceptional products and services. Our Electric Knife Switch is designed for reliability, durability, and flexibility, ensuring superior performance in a variety of industrial applications. Backed by a one-year warranty and robust after-sales support, we offer comprehensive online technical assistance and on-site services to ensure seamless operation and customer satisfaction.