This Product Selection Guide contains information to help select products in the I/O Relay Modules category on DigiKey.com
I/O relay modules are used in industrial control, building management, and similar applications to connect control equipment to input sources such as limit switches or proximity sensors, as well as output devices such as motors or linear actuators. Typically implemented in form factors that allow ease of replacement, their primary purpose is to allow system components operating at different voltage levels and supplied by different sources to be safely connected to a shared control system.
SelectionCharacteristics
Type: Whether the module is AC or DC, Input or Output.
Color: What color the module housing is.
Style: The type of socket associated with the module.
Voltage - Input: Typically represented by a range, this indicates the low and high voltage limits which one can expect standard operation. Voltages outside this range may damage the device and other system components.
Current - Input: This represents the maximum current to which a device will meet its given specifications. Exceeding this current may damage the device and/or other system components.
Voltage - Output: Indicates the maximum output voltage that a device is capable of accommodating, subject to specified limitations or constraints.
Current - Output: The maximum amount of current that can be output by the device.
Turn On Time: Characterizes the time delay between the application of rated coil voltage and the closure (or opening) of all contacts that occurs as a result. Typically does not include contact bounce time.
Turn Off Time: Characterizes the time delay between the removal of power from the device coil and all contacts returning to their rest positions. Does not include bounce time, and may be affected by the choice of control circuitry.
Features: These are different capabilities or properties of the device such as epoxy coated or fused.
ProductExamples
| MFR PART # | 70M-IDC5 |
|---|---|
| DIGIKEY PART # | GH7027-ND |
| MANUFACTURER | Grayhill Inc. |
| DESCRIPTION | Component Mount TO-18 Circular 0.060" (1.52mm) White |
| DATASHEET | Click Here |
| MFR PART # | 84130104 |
|---|---|
| DIGIKEY PART # | 646-1067-ND |
| MANUFACTURER | Sensata-Crydom |
| DESCRIPTION | Component Mount TO-18 Circular 0.060" (1.52mm) White |
| DATASHEET | Click Here |
| MFR PART # | G3TA-ODX02S DC24 |
|---|---|
| DIGIKEY PART # | Z5720-ND |
| MANUFACTURER | Omron Automation and Safety |
| DESCRIPTION | Component Mount TO-18 Circular 0.060" (1.52mm) White |
| DATASHEET | Click Here |
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MediaLinks
Videos
How to Choose a Relay - Another Teaching Moment | DigiKey
Product Training Modules
PC Board and DIN SSRs - TE Connectivity | DigiKey