SolaHD Drive Isolation Transformers

SolaHD Drive Isolation Transformers are specifically designed for SCR (Silicon Controlled Rectifier) variable speed drive applications where electrical isolation, voltage transformation and improved system performance are required. These three-phase dry-type transformers are engineered to withstand the electrical demands, mechanical stresses and harmonic conditions associated with industrial SCR drive systems.

Available in ratings from 7.5 kVA through 440 kVA, SolaHD Drive Isolation Transformers provide multiple standard voltage configurations, electrostatic shielding to attenuate line-to-ground electrical noise, and primary voltage taps for adjusting incoming source voltage. Standard designs utilize delta primary and wye secondary configurations commonly used with three-phase rectifier circuits.

Wallco Inc. is a Factory Authorized SolaHD Distributor offering assistance selecting the proper transformer based on your drive horsepower, voltage requirements, installation environment and electrical system configuration.

Browse the available SolaHD Drive Isolation Transformers below. If you need assistance selecting the correct transformer, Wallco can help identify the proper model based on your available primary voltage, required secondary voltage, drive horsepower and kVA requirements.

About SolaHD Drive Isolation Transformers

SolaHD Drive Isolation Transformers are specifically engineered for SCR (Silicon Controlled Rectifier) variable speed drive applications where electrical isolation, voltage transformation and reliable system performance are required. Unlike standard power distribution transformers, these units are designed to meet the electrical demands of industrial SCR drive systems while helping reduce electrical noise and improve system reliability.

Available in three-phase ratings from 7.5 kVA through 440 kVA, these transformers feature electrostatic shielding, primary voltage taps, delta primary and wye secondary configurations, and multiple standard voltage combinations for a wide range of industrial motor control applications.

Available Ratings

SolaHD Drive Isolation Transformers are available in ratings from 7.5 kVA through 440 kVA for three-phase applications. Standard models support a wide range of drive horsepower requirements depending on the selected voltage group.

Key Features

• Designed specifically for SCR variable speed drive applications
• Three-phase dry-type construction
• Available from 7.5 kVA through 440 kVA
• Electrostatic shielding helps reduce line-to-ground electrical noise
• Primary voltage taps for incoming voltage adjustment
• Delta primary / Wye secondary configurations
• Multiple standard voltage combinations
• Full-capacity secondary neutral
• Optional NEMA Type 3R weather shields available
• Optional wall mounting brackets available
• 10-year limited warranty
• RoHS compliant

Typical Applications

• SCR variable speed drives
• Industrial motor control systems
• Manufacturing equipment
• Process control systems
• Pump control applications
• Conveyor systems
• Material handling equipment
• Heavy industrial machinery

Benefits of Drive Isolation Transformers

Drive isolation transformers electrically isolate the incoming power source from the connected SCR drive while providing the voltage transformation required by the application. The built-in electrostatic shield helps attenuate line-to-ground electrical noise, improving overall system performance and helping protect connected equipment.

How to Select a Drive Isolation Transformer

Selecting the proper transformer requires evaluating several application requirements, including:

• Available primary voltage
• Required secondary voltage
• Drive horsepower
• Required kVA rating
• Operating frequency
• Indoor or outdoor installation
• Whether a NEMA Type 3R weather shield is required

The SolaHD Drive Isolation Transformer catalog includes selection tables, wiring diagrams, dimensions and horsepower recommendations to help identify the correct model.

Related SolaHD Transformer Solutions

Depending on your application, another SolaHD transformer family may provide a better solution.

• SolaHD K-Factor Ventilated Transformers – Designed for variable frequency drives, UPS systems and other non-linear loads that generate harmonic currents.
• SolaHD General Purpose Transformers – Reliable dry-type transformers for industrial and commercial power distribution applications.
• SolaHD Buck-Boost Transformers – Economical voltage correction for low- and high-voltage conditions.

Frequently Asked Questions

What is a drive isolation transformer?

A drive isolation transformer is designed specifically for SCR variable speed drive applications. It provides electrical isolation between the incoming power source and the drive while supplying the required voltage transformation.

What sizes are available?

SolaHD Drive Isolation Transformers are available in three-phase ratings from 7.5 kVA through 440 kVA.

Can these transformers be installed outdoors?

Yes. Ventilated models may be used outdoors when equipped with the appropriate optional NEMA Type 3R weather shield. Always verify the enclosure requirements for the specific model and installation.

Do these transformers reduce electrical noise?

Yes. An electrostatic shield is incorporated into the transformer design to help attenuate line-to-ground electrical noise that can affect sensitive equipment.

Why Buy from Wallco Inc.?

• Factory Authorized SolaHD Distributor
• Knowledgeable application assistance
• Help selecting the correct voltage group and kVA rating
• Competitive pricing
• Fast order processing
• Serving industrial customers since 1937

If you need assistance selecting the proper SolaHD Drive Isolation Transformer, contact Wallco Inc. We can help identify the correct model based on your primary voltage, required secondary voltage, drive horsepower and application requirements.