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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.

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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

High-Safety Protective Design

Visible contact isolation structure clearly indicates the on/off state, eliminating the risk of live operation; IP3X protection (operation surface) blocks solid foreign objects ≥2.5mm.

Bimetallic arc-resistant baffle enhances arc tolerance by 30%, withstanding 3.6kV AC withstand voltage for 1 minute without breakdown, meeting strict safety requirements.

Flexible Single/Double Throw Configuration

Offers single-throw (1P/3P) for power disconnection and double-throw for dual-power/load switching, with rated currents from 100A to 1600A to fit diverse power distribution needs.

Long Lifespan & Corrosion Resistance

Silver-plated contacts (thickness ≥8μm) ensure low contact resistance (≤50μΩ) and a mechanical life of ≥10,000 operations for stable conductivity.

UL94 V-0 flame-retardant PC housing resists high/low temperatures and corrosive gases (e.g., H₂S, SO₂), ideal for harsh industrial environments.

Rugged Environmental Adaptability

Operates at 20%-90% RH (no condensation) with Pollution Degree 3, resisting dust and chemical contamination for reliable performance in harsh conditions.

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℃

Main Isolation for Low-Voltage Distribution：As the main incoming power switch in switchgear, providing a visible electrical break for maintenance safety.

Motor Control Circuit Switching：Double-throw switches enable no-load switching between primary and backup power/loads, suitable for industrial production lines.

DC Isolation in PV Systems：Used with circuit breakers, custom DC models available for physical isolation of PV array DC sides.

Safe Power Disconnection for Equipment Maintenance：Disconnects power during maintenance of transformers, capacitors, etc., complying with electrical safety protocols.

Installation Requirements

Install vertically in vibration-free, corrosion-free cabinets with at least 50mm heat dissipation space for proper ventilation. Tighten terminal bolts to specified torque (e.g., 80N·m for 1600A model) to ensure reliable electrical connections.

Operation Guidelines

No Load Operation! Switch only after the circuit breaker is turned off; confirm complete power disconnection before opening/closing. For double-throw switches, check phase consistency between two power sources before switching to avoid equipment damage.

Q1: Can the isolating switch replace a circuit breaker?

A: No. The switch has no arc-extinguishing capability and is only for isolation; it must be used with a circuit breaker for circuit protection.

Q2: Does high humidity affect performance?

A: The switch operates at ≤90% RH (20℃, no condensation). Add a moisture-proof heater in environments prone to condensation.

Q3: How to detect poor contact?

A: Regularly measure contact resistance (standard ≤50μΩ). If temperature rise exceeds 60K, inspect and clean the contact surface immediately.