What is the function of the device in the picture. Unfortunately, I did not make a full diagram of how it was wired, but the hot and the corresponding neutral were connected by crimp-on leads on the right side. The hot was downstream from a lutron dimmer and there were three other 14/2 wires in the box which I'm not sure where they led to.

enter image description here

  • Can you show us the front of the device? – ThreePhaseEel Apr 28 '18 at 19:23
  • This is the front of the device. The plastic box is mounted on a 2x6. – Wynne Apr 28 '18 at 20:07
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    Can you show at an angle? It kinda looks like a contractor or relay. Is there any writing anywhere? – Tyson Apr 28 '18 at 20:27
  • Can you take it out of the box and get a picture from the side? – Mark Apr 28 '18 at 20:40

That is a contactor. With the proper electrical signal to a coil underneath it magnetically draws the switching plate across the contact points and closed the circuit. This type of unit is typically rated for 15 to 40-Amps. It is an electrically operated switch for heavier loads.

  • Likely used in this case to switch more than one circuit simultaneously... but being downstream from a lutron dimmer makes no sense. – Tyson Apr 29 '18 at 0:22

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