3 Pole HD11 Knife Switch | 100A-1600A LV Isolator Disconnector

3 Pole HD11 Knife Switch | 100A-1600A LV Isolator Disconnector

The LVMA 3P HD Series Knife Disconnect Switch is a heavy-duty 3-phase isolator for 380V AC systems, available in 100A/200A/400A ratings. With a phenolic resin base, copper contacts, and visible break, it ensures safe power isolation for industrial distribution panels and maintenance procedures.
The LVMA 3P HD Series Knife Disconnect Switch is a heavy-duty 3-phase isolator for 380V AC systems, available in 100A/200A/400A ratings. With a phenolic resin base, copper contacts, and visible break, it ensures safe power isolation for industrial distribution panels and maintenance procedures.

1. Product Overview

The LVMA 3P HD Series Knife Disconnect Switch is a heavy-duty, 3-phase manual isolator designed for safe electrical isolation in low-voltage AC distribution systems. Built with a robust phenolic resin base and high-conductivity copper contacts, this knife switch provides a visible break for maintenance safety while handling rated currents from 100A to 400A at 380V AC. It is widely used as a main disconnect switch in distribution panels, industrial control centers, and commercial power systems.

2. Key Specifications

Parameter Details
Model HD Series (HD11/HD12 etc.)
Poles 3P (3-Phase)
Rated Current 100A / 200A / 400A / 800A / 1600A(options)
Rated Voltage AC 380V / 50Hz
Insulation Base Material Phenolic resin (high mechanical & dielectric strength)
Contact Material High-conductivity copper, silver-plated optional
Handle Type Manual lever handle (insulated)
Visible Break Yes, full visible contact separation
Mounting Panel/base mount
Compliance Standards GB 14048.3, IEC 60947-3
Operating Temperature -10°C ~ +60°C
Mechanical Life ≥5,000 operations

3. Core Features

✅ Visible Electrical Isolation: Full visible contact separation ensures clear confirmation of the “OFF” state for maintenance safety.

✅ Heavy-Duty Construction: Robust phenolic resin base provides excellent mechanical strength and insulation performance.

✅ High-Current Capacity: Available in 100A-1600A ratings to meet various industrial distribution needs.

✅ Durable Contacts: High-conductivity copper contacts with optional silver plating for low resistance and anti-welding performance.

✅ Insulated Handle: Ergonomic, insulated lever handle ensures safe manual operation even under load conditions.

✅ Corrosion Resistance: Anti-rust treatment on metal components ensures long service life in industrial environments.

✅ Simple & Reliable Design: No complex electronics, offering high reliability and low maintenance for heavy-duty applications.

4. Applications

  • Main power disconnect in industrial distribution panels
  • 3-phase motor control centers and machine tools
  • Commercial building electrical systems
  • Generator backup power systems
  • Farm and agricultural power distribution
  • Mining and heavy-duty industrial applications

5. Why Choose LVMA 3P HD Series Knife Switch?

  • Proven Reliability: Simple mechanical design ensures consistent performance even in harsh industrial conditions.
  • Safety First: Visible break design meets safety codes for maintenance lockout/tagout procedures.
  • Versatile Ratings: Multiple current options (100A–1600A) to match different system capacities.
  • Durability: High-quality materials and anti-corrosion treatment ensure long-term use with minimal maintenance.
  • Cost-Effective: Affordable, no-frills solution for basic yet reliable power isolation.

6. Technical Documents & Support

  • Download the full datasheet for detailed specifications, wiring diagrams, and installation instructions.
  • Contact our engineering team for custom pole/current configurations or OEM solutions for large-scale projects.
  • Request a quote with your project details for bulk pricing, lead times, and compliance certifications.

1. Product Overview

The LVMA 3P HD Series Knife Disconnect Switch is a heavy-duty, 3-phase manual isolator designed for safe electrical isolation in low-voltage AC distribution systems. Built with a robust phenolic resin base and high-conductivity copper contacts, this knife switch provides a visible break for maintenance safety while handling rated currents from 100A to 400A at 380V AC. It is widely used as a main disconnect switch in distribution panels, industrial control centers, and commercial power systems.

2. Key Specifications

Parameter Details
Model HD Series (HD11/HD12 etc.)
Poles 3P (3-Phase)
Rated Current 100A / 200A / 400A / 800A / 1600A(options)
Rated Voltage AC 380V / 50Hz
Insulation Base Material Phenolic resin (high mechanical & dielectric strength)
Contact Material High-conductivity copper, silver-plated optional
Handle Type Manual lever handle (insulated)
Visible Break Yes, full visible contact separation
Mounting Panel/base mount
Compliance Standards GB 14048.3, IEC 60947-3
Operating Temperature -10°C ~ +60°C
Mechanical Life ≥5,000 operations

3. Core Features

✅ Visible Electrical Isolation: Full visible contact separation ensures clear confirmation of the “OFF” state for maintenance safety.

✅ Heavy-Duty Construction: Robust phenolic resin base provides excellent mechanical strength and insulation performance.

✅ High-Current Capacity: Available in 100A-1600A ratings to meet various industrial distribution needs.

✅ Durable Contacts: High-conductivity copper contacts with optional silver plating for low resistance and anti-welding performance.

✅ Insulated Handle: Ergonomic, insulated lever handle ensures safe manual operation even under load conditions.

✅ Corrosion Resistance: Anti-rust treatment on metal components ensures long service life in industrial environments.

✅ Simple & Reliable Design: No complex electronics, offering high reliability and low maintenance for heavy-duty applications.

4. Applications

  • Main power disconnect in industrial distribution panels
  • 3-phase motor control centers and machine tools
  • Commercial building electrical systems
  • Generator backup power systems
  • Farm and agricultural power distribution
  • Mining and heavy-duty industrial applications

5. Why Choose LVMA 3P HD Series Knife Switch?

  • Proven Reliability: Simple mechanical design ensures consistent performance even in harsh industrial conditions.
  • Safety First: Visible break design meets safety codes for maintenance lockout/tagout procedures.
  • Versatile Ratings: Multiple current options (100A–1600A) to match different system capacities.
  • Durability: High-quality materials and anti-corrosion treatment ensure long-term use with minimal maintenance.
  • Cost-Effective: Affordable, no-frills solution for basic yet reliable power isolation.

6. Technical Documents & Support

  • Download the full datasheet for detailed specifications, wiring diagrams, and installation instructions.
  • Contact our engineering team for custom pole/current configurations or OEM solutions for large-scale projects.
  • Request a quote with your project details for bulk pricing, lead times, and compliance certifications.

Data Download

LVMA low voltage selection manual

Related Products

Contact Us

Have questions about our products or services? Our team is here to help you with any inquiries.

Email Address

Your Name

Your phone

Message

Contact Information

Follow Us