Switch & Bus Insulators

Standard and custom indoor and outdoor insulator styles in various voltage classes

Transformer & Switchgear Bushings

Transformer & Switchgear Bushings

Indoor and outdoor bushings in various styles and voltage classes with current ratings up to 5000 A

Current Transformers


A wide array of indoor and outdoor low and medium voltage current transformers for control, metering and relaying applications

Custom & Retrofit

Custom &

Hundreds of custom and standard insulating and bushing product designs tailored to your specifications


Polycast is an electrical engineering firm that specializes in the design and manufacture of epoxy-cast electrical components. Founded in 1972, Polycast is one of the few companies that pioneered the development of polymeric electrical products in North America. Today, Polycast’s product selection exceeds over 10,000 items. These include many of the first indoor and outdoor medium voltage epoxy insulators, bushings, current transformers and custom-designed items ever made.  We take pride in the knowledge that Polycast epoxy-cast products are in service throughout the world, in all climates and environments, and in applications where other materials have proved to be inadequate. With our knowledge and experience, we have evolved into the leading source of technically demanding quality castings.

Polycast provides engineering solutions for electrical utilities and for original equipment manufacturers of transformers and switchgear, as well as those in need of replacements for obsolete parts. We offer a complete design, development, and manufacturing service. From original concept, through design and tool manufacture, prototype testing, and full production runs of the approved product, our creative team will work with you to achieve your goals.

Our product range extends from the simplest forms of cast insulation for low voltage applications to more complex low and medium voltage components. We offer the following items in either indoor or outdoor material for voltage class applications as high as 46kV:

epoxy switch and bus insulators of various mechanical strength classes
epoxy roof and wall bushings with current ratings to 7,500 Amps
epoxy breaker bushings
epoxy current transformers for control, metering, and relaying applications
custom made epoxy products for  transformers and switchgear

We also manufacture:

taped bushing current transformers
bushing hardware such as clamps, gaskets, jam nuts, and connectors
multi-stud and multi-lead terminal blocks

Polycast is dedicated to excellence. As an ISO 9001:2008 certified company, our team is committed to quality in the design, manufacture, and testing of products at our state of the art facility. Let us be your partner in the research and development of innovative solutions to exceed your product improvement needs and manufacturing challenges.