For critical systems, demanding environments, and any application where downtime is not an option, these reliable power supplies convert AC to DC voltage to keep power flowing. They mount onto DIN rails, which are usually found inside electrical panels and cabinets. Made with the highest-quality internal components, they're designed to last in marine, heavy industrial, and other tough environments. Power supplies with spring-clamp terminals connect quicker and hold firmer than screw-style terminals.

These power supplies maintain a stable output, even in facilities with electrical noise, voltage fluctuation, or poor power quality. Compared to standard power supplies, they require less start-up current, which further improves stability. All use switching regulation, which means they produce the stated voltage despite fluctuations in your input power and the power being drawn by your system, and they won’t become too hot. Some are also SEMI F47 compliant, meaning they meet standards for maintaining output voltage when input voltage dips. This is commonly known as voltage sag immunity.

For many of these power supplies, exceeding the maximum voltage, temperature, or load will cause the power supply to shut down to protect both the power supply and the connected equipment. Some power supplies meet the voltage requirements for use in a PELV (protected extra low voltage) circuit; some also meet the requirements for use in SELV (separated extra low voltage) circuits.

Rated IP20, these power supplies prevent your fingers from touching internal components and accidentally shocking yourself. With various domestic and international certifications, such as UL listing, CE marking, and TUV Rheinland certification, these power supplies meet stringent safety standards. Some meet additional standards for marine vessels classed by DNV-GL and Lloyd's Register.

Power supplies with an NEC Class 2 output limit the risk of electrical shock should something fail inside the power supply.

Maximum output noise is also known as ripple noise. The lower the value, the less interference the power supply creates. For most applications, a value over 100mVpp isn’t a problem. However, when using to power extremely sensitive electronics, such as audio equipment and high-precision measuring and testing equipment, you’ll want an output noise around 5mVpp or less.

Power factor shows how effectively a power supply draws AC power from the main electrical supply. The higher the power factor—up to a maximum score of 1—the lower your operating cost.

Efficiency describes how good a power supply is at converting the AC power it draws from your main electrical supply into DC power. High-efficiency power supplies cost less money to operate and produce less heat, meaning cooler temperatures in your electrical cabinet.

Power supplies with an output peak current briefly boost power above their maximum operating current for starting motors, actuating solenoid valves, and other applications that require a higher starting current than their operating current. All of this means you get a more powerful power supply in a compact size.

Power supplies with an output voltage signal send a signal that indicates the status of their output voltage, so you know if your power supply isn't working correctly. Configure them to light up a panel or activate an alarm when voltage drops, or connect them to a PLC for remote system monitoring.