A solenoid is an electromagnetic switching device, used to switch on and off heavy duty circuits such as starting motors or glow plug circuits.

They are similar to relays in construction, operation and use. The main difference is that in relays, we use an electromagnet to close a set of contact points, but in a solenoid we use an electromagnet to move a soft iron armature into a circuit so that it completes an electrical pathway between two terminals.

Solenoid complete with legend

Below, we can see a solenoid controlling a glow plug circuit:

Solenoid in a glow plug circuit

» Course Glossary


Please note, if you want to contact the main Training Centre in Baldoyle, you need to ring 01-8167400.

If you want to contact the CP Fitters' Section, you can Contact Us by email, admin@cpfitters.info, or by telephone: 00 353 1 8167543 This number gets you through to the CP Fitters' Section, Baldoyle Satellite Unit.

Our Address is : Construction Plant Fitters' Section, Unit 116, Grange Way, Baldoyle Industrial Estate, Baldoyle, Dublin D13 CA48.
We operate in a satellite unit which is about 300 metres away from the main training centre. You can see the location of this unit here, in Google Maps. You can also Check here for directions to the Baldoyle Training Centre.

Find Us on Find us on YoutubeFollow cpfitters on Twitter

Is Féidir Linn! You can view all the menus on this site as Gaeilge by going to the homepage, top right hand corner, and dropping down the language selection menu. By default it reads English (en), so just select Gaeilge (ge) instead.