Master solenoid

[Delta Whisky]

Speaking of master solenoids: after beta testing, I just converted to a unit that B&C might start selling soon. It is a quarter pound lighter, draws only 329 mA, and has a built-in diode.

[Eric Page]

I just converted to a unit that [...] is a quarter pound lighter, draws only 329 mA, and has a built-in diode.

Do you have a manufacturer and part number for it?

[jrevens]

The very common White-Rodgers type 70 or 71 should be mounted vertically with the”cap” down. There are other types/brands that may not have that recommendation or requirement.

[jrevens]

The diode is recommended to protect the contacts on the switch that is used to control the solenoid. When the coil is de-energized & the magnetic field collapses, a high voltage “spike” can be induced that causes arcing at the switch contacts. An inductive load, like a relay coil, should ideally have a diode to protect the controlling switch contacts. Some solenoid relays will have one built in. A simple silicon diode of the proper voltage rating is what’s needed. The 4000 series are a good choice.

[Kitfox Pilot]

Thanks again for all your help guys!