Relay

[Sam_DRT]

I'll check with the team members who actually did the electronics, but I believe we used a RB-POL-309 to switch concussions' contactor. Worked fine throughout series 10, despite my concerns that it looked a bit fragile, and how close behind the drum it was. Though we did have it sat on little rubber bobbin mounts which probably helped it survive.

Edit: Have checked, this was the one.