CALL US: 570-823-6181 | FREE DOMESTIC SHIPPING ON ORDERS OVER $1,000 | Your trusted industrial supplier!
SolaHD Low Temperature Rise Ventilated Transformers are designed for critical applications requiring cooler operating temperatures, additional thermal reserve and enhanced reliability. These dry-type transformers use a 220°C insulation system and are available with either an 80°C or 115°C temperature rise under full nameplate load.
Compared with a standard 150°C rise transformer, the lower operating temperature provides additional thermal reserve. SolaHD identifies a 35°C thermal reserve for 115°C rise models and a 70°C thermal reserve for 80°C rise models. This additional reserve can help improve reliability and provide short-term overload capability when properly applied.
Standard models are available in single-phase ratings from 15 kVA through 100 kVA and three-phase ratings from 15 kVA through 300 kVA. Published configurations include 240 x 480 volt primary with 120/240 volt secondary for single-phase applications, along with several three-phase voltage configurations.
Wallco Inc. is a Factory Authorized SolaHD Distributor providing expert assistance selecting the proper temperature rise, phase, voltage configuration, kVA rating and accessories for your application.
The official SolaHD catalog includes 80°C and 115°C rise selection tables, catalog numbers, dimensions, shipping weights, electrical connections, voltage taps, weather-shield requirements and available optional designs.
Download the SolaHD Low Temperature Rise Ventilated Transformers Catalog (PDF)
Browse the available SolaHD Low Temperature Rise Ventilated Transformers below. Contact Wallco Inc. with your primary voltage, required secondary voltage, phase, kVA rating and desired temperature rise for assistance identifying the proper model.
SolaHD Low Temperature Rise Ventilated Transformers are designed for applications where cooler transformer operation, additional thermal reserve and enhanced reliability are important. These transformers feature a 220°C insulation system with either an 80°C or 115°C temperature rise under full nameplate load.
Reducing the transformer temperature rise creates additional margin between the normal operating temperature and the temperature limit of the insulation system. SolaHD identifies a 35°C thermal reserve for 115°C rise transformers and a 70°C thermal reserve for 80°C rise transformers.
This additional thermal reserve makes these transformers well suited for critical installations and applications requiring extra short-term overload capability. SolaHD states that 80°C and 115°C rise units may be operated as 150°C rise transformers to provide approximately 15% to 30% short-term overload capability without compromising normal life expectancy when properly applied.
SolaHD Low Temperature Rise Transformers are available with two standard temperature-rise options:
Both designs use a Class 220°C insulation system. The appropriate temperature-rise rating depends on the required reliability, expected loading conditions, ambient temperature and application requirements.
The published SolaHD selection tables include both single-phase and three-phase models.
Standard single-phase models are listed with 240 x 480 volt primary and 120/240 volt secondary configurations. Published three-phase configurations include 480 Delta primary with 208Y/120 secondary and 480 Delta primary with 240 Delta secondary and a reduced-capacity 120-volt center tap.
Additional voltage configurations, copper-wound designs and other optional designs may be available. Contact Wallco Inc. for assistance with requirements outside the standard published selection tables.
Transformer insulation life is affected by operating temperature. A transformer designed for a lower temperature rise operates with greater thermal margin when supplying its full nameplate load under the specified conditions.
The additional thermal reserve may provide several application benefits:
A low temperature-rise transformer does not eliminate the need to consider ambient temperature, ventilation, enclosure, loading and installation conditions. The transformer must still be selected and installed according to the manufacturer’s specifications and applicable electrical requirements.
The temperature-rise rating indicates the expected increase in winding temperature above ambient temperature when the transformer is operating at full rated load under specified conditions.
The lower temperature-rise options may be preferred for critical loads, applications with intermittent overload requirements or installations where reduced thermal stress is important.
SolaHD states that its 80°C and 115°C rise transformers can provide approximately 15% to 30% short-term overload capability when operated as 150°C rise units, without compromising normal life expectancy when properly applied.
The actual permissible overload depends on the transformer model, ambient temperature, duration of the overload, previous loading, ventilation and other installation conditions. Short-term overload requirements should be reviewed carefully before selecting a transformer.
Selecting the correct transformer requires evaluating the electrical and environmental requirements of the application, including:
The SolaHD catalog includes selection tables, dimensions, weights, voltage configurations, electrical connections and accessory information to help identify the proper model.
Available accessories and optional configurations may include:
Weather shields are ordered separately and must match the specific transformer enclosure. Not every optional design is UL Listed, so availability and certification should be confirmed before ordering.
Depending on your load and operating requirements, another SolaHD transformer family may provide a better solution.
A low temperature rise transformer is designed to operate with a lower winding-temperature increase above ambient temperature than a standard 150°C rise transformer. SolaHD offers models with either an 80°C or 115°C temperature rise and a 220°C insulation system.
Thermal reserve is the additional temperature margin between the transformer’s rated operating temperature and the temperature limit of its insulation system. SolaHD identifies a 35°C thermal reserve for 115°C rise models and a 70°C thermal reserve for 80°C rise models.
An 80°C rise transformer operates cooler and provides more thermal reserve than a 115°C rise transformer. Both use a 220°C insulation system, but the 80°C rise design provides approximately 70°C of thermal reserve compared with approximately 35°C for a 115°C rise model.
Yes. SolaHD states that its 80°C and 115°C rise transformers can provide approximately 15% to 30% short-term overload capability when operated as 150°C rise units and properly applied. The allowable overload depends on the model, duration, ambient temperature and loading conditions.
The published SolaHD selection tables include single-phase models from 15 kVA through 100 kVA and three-phase models from 15 kVA through 300 kVA.
Ventilated models may be installed outdoors when equipped with the correct optional UL Listed NEMA Type 3R weather shield. The weather shield must match the transformer enclosure and is ordered separately.
Yes. Copper-wound designs are listed as an available optional configuration. Availability should be confirmed for the required voltage, phase, kVA rating and temperature-rise option.
Yes. Wall-mounting brackets are available for applicable ventilated transformer models. The transformer weight and bracket capacity must be verified before installation.
Contact Wallco Inc. with your primary voltage, required secondary voltage, phase, kVA rating, desired temperature rise and application requirements. We can help identify the correct SolaHD Low Temperature Rise Ventilated Transformer and any required accessories.