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Lead Contents

Power Supplies

OMRON provides many types of general-purpose Power Supplies, such as the type mounted to DIN rail or the type built into equipment. OMRON also provides the S8VS which provides notification of replacement timing, and the Buffer Block that handles momentary power interruptions, and other highly reliable Power Supplies.

Overview Features
Principles Classifications
Engineering Data Further Information

Related Contents

Primary Contents

Regulated DC Power Supplies

The methods for controlling Regulated DC Power Supplies can be largely classified into the following two types. Switch-mode Power Supplies and linear Power Supplies are generally referred to as Power Supplies. Currently, switch-mode Power Supplies are the most prevalent.

Regulated DC Power Supplies_fig

Switch-mode Power Supplies

Switch-mode power supplies convert commercial AC power into the required high-frequency DC power using the high-speed switching of emiconductors. Switch-mode power supplies are so compact, light, and efficient that they are used as power supplies by most electronic devices.



Highly efficient.

Compact, and light.

A wide input voltage range.


Switching noise is generated.

Large inrush current on primary side.

Power Supply Selection

Basic Selection Points

Factors to consider when selecting a Power Supply are provided in the following diagram.



The following functions are available: overcurrent protection, overvoltage protection, harmonic current control, and alarm outputs. The functions that are provided depend on the model. Check the function specifications.

Overcurrent Protection

All models provide overcurrent protection. The protection method that is used will affect startup characteristics.

Life Expectancy

The warranty period and life expectancy of the Power Supply depend on the model.
Select a model with suitable specifications for your application.
Periodic maintenance is required for the cooling fan.


Install the Power Supply so that there is sufficient space for air to flow around it.
The mounting direction and space requirements are specified for each model. The load rate may have to be reduced depending on the installation method.

Inrush Current

Select the newest models to allow for the inrush current of the Power Supply.
Make sure that the circuit breaker will not be tripped by inrush current. Even for the same model, the inrush current will be different for 100 VAC and 200 VAC.