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• The GCA Family

There are quite a few situations, where we need to switch AC.
Most will have to do with just using a transformer for powering a turnout, mechanical signal or decoupler.
GCA76 and GCA77 are suitable to switch these units, but only with DC.
Also to be able to switch a frog on a turnout, a relay is mostly the only way to do it in a reliable way.
Relayboard GCA137 is made for that purpose only, but it will not suit the GCA-PIxx RocNet units.
The relay board as presented here, is a more universal module.
It contains 8 relays, which can be used for various situations.

• 4 pairs of relays to switch 4 turnout frogs. Relays are switching the railpower, which is also AC in digital systems.
• 4 pairs of relays to switch turtoise or hoffmann turnout drives, also switching ac.
• 8 individual relays to switch anything you can think of, as long as it is no more than 42 Volts and/or 1 ampere.
  

Selection of different tasks is made by a set of 5 jumpers with each pair of relays.
The maximum current demand for this board with all relays activated = 240 mA.
In most situations only half of the relays are switched on, with pulse output almost none.
It should be considered with this the total current, that a voltage regulator on either CAN-GC2 board or GCA50 should be able to handle that..
Be sure on these boards that 5V regulator IC is mounted with nut in between pc-board and IC, to improve cooling.
This is also mentioned on the partslist.
If it is used with GCA_PI02, the RocNet network needs an adequate supply like GCA_PI06.

Professional made boards are available.
Single boards or complete kits. See GCA

Each pair of relays can have different tasks either together or standalone, selectable by jumpers.
To select a task, use these diagrams.