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Completely self-protected, single-phase pad-mounted transformer
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Completely self-protected, single-phase pad-mounted transformer

Eaton’s Cooper Power series completely self-protected (CSP), single-phase pad-mounted transformers are designed for exceptional performance. With direct-connected primary arresters, a MagneX interrupter or a secondary circuit breaker with internal primary voltage fuses, the CSP transformers eliminate the need for separately mounted protective devices while reducing installation costs. Available from 10-75 kVA (or 10-167 kVA with a MagneX interrupter), CSP transformers meet or exceed the requirements of applicable ANSI and NEMA standards. CSP transformers can be filled with standard electrical grade mineral insulating oil or fire-resistant Envirotemp FR3 fluid.

Completely self-protected single-phase pad-mounted transformer
10-167 kVA
Primary voltage
2400-19,920 V
Secondary voltage
120-600 V

Core features

  • Utilises internal overcurrent devices and arresters for overvoltage protection, without the need for separate external protection devices
  • Utilises a secondary breaker with weak link, or an optional MagneX Interrupter, for secondary fault and overload protection
  • Available option of Envirotemp FR3 fluid for increased fire safety or electrical grade mineral oil
  • Meets or exceeds industry standards including ANSI, NEMA and DOE energy efficiency standards
  • Cores and coils designed for high reliability and low field failure rates
  • Tin-plated high and low-voltage bushing terminals to accommodate aluminium or copper conductors
  • Available in MaxiShrub with an ANSI Type-1 frontplate or Shrubline with an ANSI Type-2 frontplate, which allows for a lower profile for improved aesthetics

Internalised protection for installation cost savings

Transformers can be deployed with a variety of protection options, including a MagneX interrupter or a secondary breaker with weak link for secondary fault and overload protection; a primary weak link fuse; a current-limiting fuse for high interrupting ratings and limiting fault currents; low-voltage distribution class MOV arrester; and internal or external lightning arresters. Eliminates the need to install external overcurrent devices and simplifies power restoration.

The safer, environmentally friendly choice

For fire-sensitive locations, Envirotemp FR3 fluid is recommended in transformers. The fire-resistant, natural ester-based fluid also offers the benefits of a soy oil-based dielectric coolant that is sustainable and has unique environmental and material properties. Transformers may also be filled with standard electrical grade mineral insulating oil.

Optional MagneX Interrupter

Eaton's Cooper Power series MagneX interrupter is an overcurrent protective device that protects distribution transformers from damaging overloads and secondary faults, and is also used for switching the transformer “on” or “off”. As a transformer protective device, the MagneX interrupter combines safety and efficiency with economic operation. It is designed for use in transformer (mineral) oil or Envirotemp FR3 fluid-filled transformers.