Wire AC Router to SSR 2

Wire an AC Router to a SSR

Check that you can see the pronged plugs of the router and extension cord are not plugged in.
Best practice – hold the plugs in your hand and visually trace the cords back to the router and other end of the extension cord. This will confirm they are not plugged in.


Fit SSR in Electronics Enclosure

What is an SSR?
An SSR is basically a switch that will turn off and on a single wire but instead of having to push or flip a physical switch, you simply supply a currant to the signal side of the SSR to activate it. The advantage of this is being able to control the SSR with an electronic device via a program to turn equipment off and on (like your router). So the basic concept is the SSR doesn’t supply a current itself, rather it is a component used in line with the incoming current to a device and is used to switch it off and on remotely.

Image courteously of Marshal Wolf Automation

A Quick Overview
The following diagram will give you a quick overview of the SSRs terminals, mountpoints and data plate. 

  1. AC Live In
  2. AC Live Out
  3. DC-     (Control Signal)
  4. DC +   (Control Signal)
  5. M4 Mounting Points
  6. Activity Indicator (LED)
  7. Max Amperage of SSR
  8. Control Currant and Switching Current
  9. Range of current that can be switched on/off (from mains power)
  10. Range of signal current (from Breakout board)

Mounting the SSR
When mounting an SSR in your electronics enclosure please use the following diagram for your reference. There are also several considerations you should take in to account when choosing an installation position for the SSR:

  • The base of the SSR will produce heat when it’s activated, a 20mm heat dispersal zone all the way around is  recommended.
  • The signal side of the SSR (terminals 4 and 3) should face or be accessible by your breakout board.
  • AC currents can interfere with low voltage DC currents, it’s recommend that the AC terminals (1 and 2 in the diagram) be located away from your breakout board but be in such a position that it intersects with the AC routers cable path (see STEP3).
  • When you’ve finished your wiring you may want to consider some form of cover for the AC terminals to protect you from them and avoid anything falling in and shorting the connection.

Once you’ve decided on a position to mount the SSR drill two 4.2mm bores 47.5mm apart for a nut and bolt fixing. If your going to tap the bores use a 3.3mm drill.

Mount the SSR securely to the chosen surface using screws or nuts and bolts appropriate for the material your machine is made from. You’ll want to have a clear 20mm space around the SSR to allow for heat dissipation during operation. Remember to orientate the SSR in a way that the AC wires are outermost and that the DC side is accessible to the breakout board.