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Isolating Switch

The Isolating Switch (Knife Switch) is a mechanical electrical isolation device for low-voltage power distribution systems, featuring a visible break point to ensure safety during equipment maintenance. Available in single-throw (1P/3P) and double-throw configurations, it is designed for infrequent manual operations such as power disconnection and circuit isolation. Compliant with GB14048.3 and IEC60947-3 standards, the switch adopts a fully protected design to prevent accidental electric shock, suitable for industrial switchgear, motor control centers, and PV systems. It operates stably in environments with temperatures ranging from -5℃ to +40℃ and altitudes ≤2000m.

Pole Type: Single, Double, Triple
Material: Plastic (weatherproof)
Weight: 1.000 kg
Package: Metal or Wooden Case

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Knife Switch Double Throw Protected Knife Switch Isolating Switch Industrial Grade Knife Switch for Power Distribution Corrosion Resistant Low Voltage Knife Switch

Product Advantages

Technical Parameters

Applications

Operation Guide

FAQ

Product Advantages

High-Safety Protective Design

Visible Contact Isolation: The clearly visible on/off contact isolation structure indicates the operational state, reducing the risk of live operation. The IP3X protection (operation surface) blocks solid foreign objects ≥2.5mm, ensuring enhanced safety.
Bimetallic Arc-Resistant Baffle: Increases arc tolerance by 30%, withstanding 3.6kV AC withstand voltage for 1 minute without breakdown, meeting strict safety standards.

Flexible Single/Double Throw Configuration

Single-Throw (1P/3P): Allows for power disconnection.
Double-Throw: Enables dual-power/load switching, providing flexibility for various power distribution needs.
Rated Current Range: From 100A to 1600A, catering to diverse applications.

Long Lifespan & Corrosion Resistance

Silver-Plated Contacts: The contacts feature a thickness of ≥8μm and ensure low contact resistance (≤50μΩ). These contacts support a mechanical life of ≥10,000 operations, ensuring long-term reliable performance.
Flame-Retardant PC Housing: The UL94 V-0 rated PC housing resists high and low temperatures, as well as corrosive gases (e.g., H₂S, SO₂), making it ideal for use in harsh industrial environments.

Rugged Environmental Adaptability

Operational Range: The switch operates efficiently within 20%-90% RH (no condensation), making it suitable for various environmental conditions.
Pollution Degree 3: Resists dust and chemical contamination, ensuring reliable performance in challenging industrial environments.

Isolating Switch

Rated Current (In)

100A

250A

630A

1600A

Parameter

Value

Rated Voltage (Ue)

AC 690V

Poles

1P

3P

4P

Power Frequency Withstand Voltage

3.6kV/1min

Mechanical Life

≥10

000 operations

Protection Class

IP3X (operation surface) / IP20 (overall)

Maximum Operating Torque

≤50N·m (1600A model)

Operating Temperature

-5℃ ~ +40℃

Applications

Main Isolation for Low-Voltage Distribution

Visible Electrical Break: Functions as the main incoming power switch in switchgear, providing a visible electrical break to ensure safety during maintenance.
Safety Compliance: Helps meet electrical safety protocols by clearly indicating when the power is disconnected, preventing accidental energization.

Motor Control Circuit Switching

Double-Throw Capability: Enables no-load switching between primary and backup power or loads, enhancing operational flexibility.
Industrial Application: Ideal for use in industrial production lines, providing seamless switching between power sources for critical machinery and systems.

DC Isolation in PV Systems

Custom DC Models: Offers customized solutions for isolating DC sides of photovoltaic (PV) arrays when used in conjunction with circuit breakers.
Efficient Power Isolation: Ensures physical isolation to prevent electrical hazards in solar power installations, enhancing safety and system reliability.

Safe Power Disconnection for Equipment Maintenance

Power Disconnection: Safely disconnects power during the maintenance of equipment such as transformers and capacitors, ensuring a safe working environment.
Compliance with Protocols: Meets stringent electrical safety standards, reducing the risk of accidents during maintenance operations.

Operation Guide

Installation Requirements

Vertical Installation: The isolating switch must be installed vertically in a vibration-free and corrosion-resistant cabinet to maintain optimal performance.
Ventilation Space: Ensure at least 50mm of space around the unit for proper heat dissipation and air circulation to prevent overheating.
Terminal Bolt Tightening: Tighten terminal bolts to the specified torque (e.g., 80N·m for the 1600A model) to guarantee secure and reliable electrical connections. Over-tightening may damage the components, while under-tightening can result in poor conductivity.

Operation Guidelines

No Load Operation: Always ensure the switch is operated without load. Do not switch while the circuit is under load, as this can cause arcing and damage the contacts.
Power Disconnection Confirmation: Always verify that the circuit breaker is fully turned off and that power is completely disconnected before opening or closing the switch.
Double-Throw Switches: For double-throw switches, ensure phase consistency between the two power sources before switching. This will prevent equipment damage due to phase mismatches and ensure smooth operation.