|3953_0 - AC Solid State Relay - 120V 20A|
- Connects to a Digital Output
- Switches mains power AC loads
- 120 VAC Load
- 20A Current Rating
- Connects to any device with a Digital Output.
The 3953 DC Solid State Relay can be used to switch loads of up to 120A at 20VAC using the digital output from a Phidget I/O board. The Relay comes with an optional protective cover to protect people from touching the exposed high power wires, and a varistor to protect your SSR from harmful transients and surges. All wires connect to this relay by screw terminals. If you are switching a high power load or find the relay is getting hot, please consider a heat sink. Heat sinks 3955 and 3956 are designed for use with this relay.
We've listed this SSR at 120V because the included MOV is only rated for 120V operation. If you decide that you do not need the MOV for surge protection, you can use this relay without the MOV at the manufacturer's specification of 240V.
|Relay Output Type||SCR|
|Dielectric Strength||2.5 kV AC|
|Control Voltage Min||3 V DC|
|Control Voltage Max||32 V DC|
|Load Voltage Max (AC)||120 V AC|
|Load Current Min||100 mA|
|Load Current Max (AC)||8 A|
|Load Current Max (With 3955 Heatsink)||15 A|
|Load Current Max (With 3956 Heatsink)||20 A|
|Load Surge Current||255 A|
|Turn-on Time Max||1 ms|
|Turn-off Time Max||11.6 ms|
|Operating Temperature Min||-30 °C|
|Operating Temperature Max||80 °C|
|Manufacturer Part Number||HFS34/D-240A20PS-Y|
Have a look at the Data Sheet for a complete set of specifications.
- A Protective Relay Cover
- A Heat Transfer Pad
- An MOV (Metal Oxide Varistor)
Have a look at the relay's characteristic curve in the Data Sheet to decide if you need a heat sink. Without a heat sink, the maximum current that can be handled by this relay is 8A up to an ambient temperature of 40°C.
In order to be able to switch currents of up to 20A, you have to use the 3956 - Heat Sink.
This relay connects to a Digital Output on the:
This relay connects to any device with a Digital Output.
It should be connected as shown below.