Power Transfer Switch

Very early on we bought a commercial Automatic Power Transfer Switch. It went wrong twice and we sent it back to the manufacturer. When it went wrong a third time we decided enough was enough and I designed and built our own.

There are significant differences between the Malu Marine designed unit the the original one that we bought.

1) We use contactors rather than heavy duty relays. These are what shore based Power Transfer Switches for generators use. They are much heavier duty than the relays

2) We use electrical interlocking of the contactors rather than software interlocking. Yes, it's safer!

3) We use 12 volt relays to control the contactors so we can have remote control of the system without exposing the 220 volt mains.

Installed and worked first time!