# solid state relay unexpected behavior

I've wired a teledyne s24d40 ssr to a leviton 20 amp duplex outlet using a 12 gauge extension cord.

The load is a 1200 watt wagner heat gun and I'm using a 9v battery to test.

This is my first AC project and I'm trying to make sure I haven't done something incorrectly.

ext cord green ground wire -> outlet green earth terminal
ext cord neutral white wire -> outlet silver terminal
ext cord hot black wire -> ssr output terminal 1
ssr output terminal 2 -> outlet brass terminal
+/- wires to ssr control terminals

When the ssr is triggered and the heat gun power switch is set to high, everything works as expected.

However, when the ssr is triggered with the heat gun power switch set to low, the heat gun does not power on.

Can anyone explain what's going on? I need to use the heat gun in the low setting for this application.

I apologize if this is an ignorant question, I'm still learning :)

Thanks very much for your time.

• Draw a simple schematics with schematics editor included in this forum. Add link to datasheet to SSR and heatgun. How can we know what your heat gun does? – Marko Buršič Nov 12 '19 at 21:40
• Looking at the datasheet, it seems like you're well inside the operating range. I would try connecting some other resistive type devices to the output. – Drew Nov 12 '19 at 23:12
• The relay does require a minimum load of 5ma. Perhapse the heat gun has some internal circuitry that interferes with this minimum load? What happens if you hook a splitter up the the outlet, and connect a lightbulb or similar in parallel with the heat gun? – Drew Nov 12 '19 at 23:17
• @Drew You're correct. The circuit in the heat gun switch does not draw any current when first powered, if set to low. It does start drawing current if set to high. So I tried your suggestion of hooking up a splitter with a lightbulb and the ssr turned the heat gun on when set to low. Is there a way I can mark your comment as the answer to this question? Thank you very much for your help! – IronMan9967 Nov 13 '19 at 14:43
• Thanks for the update. I'll copy it to an answer. – Drew Nov 14 '19 at 8:04

## 1 Answer

The relay requires a minimum load of 5ma. Perhaps the heat gun has some internal circuitry that interferes with this minimum load? If you hook up a splitter to the outlet and connect a lightbulb or similar in parallel with the heatgun that may solve the problem.