Often used for high-precision and sensitive electronics such as testing and audio equipment, these power supplies produce low output noise for minimal electronic interference. They are designed with linear voltage regulation, so they deliver the same voltage regardless of changes in the input voltage or current. These power supplies also have remote voltage sensing—when voltage dips they compensate with extra power, so your devices always receive the correct voltage. However, they give off more heat, weigh more, have a larger footprint, and lower efficiencies than switching power supplies. Mount them on the inside surface of device enclosures.

All meet U.S., Canadian, and European safety standards. If you exceed the maximum load or current, they shut down to protect both the power supply and the connected equipment. These power supplies cannot be sold to the listed areas due to local energy efficiency requirements.

Power supplies with overvoltage protection will shut down if you exceed the maximum voltage.

Covers keep you from accidentally touching the power supply interior, protecting you from shocks. However, these covers reduce the power supply’s maximum output by 15%.

Improve the efficiency of your equipment—wire these transformers to step your input voltage up or down by as much as 20%. Choose an input/output voltage combination that comes closest to matching your application, then choose the power output (in VA) of the equipment you want to operate. You probably won’t find the exact value you need; choose the next highest rating.

Note: Transfomers are labeled with a prewired power output and pre-wired primary and secondary voltages. Single phase transformers are labeled as 120/240V AC primary voltage and 12/24V AC secondary voltage.Three phase transformers are labeled as 120/240V AC primary voltage and 16/32V AC secondary voltage. All possible input voltage and output voltage wiring combinations are listed.