Mechanically Held Lighting Contactor

[Sean.Day72]

Pretty simple question which I think has a simple answer.

I want to use a Mechanically Held contactor with photocell for automatic control of parking lot lighting.

I understand it only takes a momentary voltage on the control coil for the contacts to switch state (close) and the contactor mechanically latches so you don't need constant coil voltage like a electrical held contactor.

Question is what makes it change state back to open (off) when only using a photocell. i.e what clears the contacts. When daylight comes back the contact in the photocell open but this doesn't apply a momentary voltage to the control coil is where I'm getting lost.

Thank you,

 

[augie47]

The latching contactors I have used in the past have had a "two wire" conversion kit available for SP switch or photocell operation.

 

[hillbilly1]

You will need a relay, single pole double throw. Does not need to be momentary, as most quality latching contactors have clearing contacts.

 

[hillbilly1]

Something like this, the photocell powers the relay, the contacts in the relay control the contactor. N/O to the latch coil, N/C to the unlatch. If it is one of the cheap GE latching contactors, you will need a conversation kit like Augie47 suggested. Either way, you will need a 24 hour hot at the relay.

https://www.wolfautomation.com/rh1b-uac120v-ice-cube-relay-120vac-1-pole-spdt-blade/?gclid=EAIaIQobChMIvomTlZyo9wIVTPvjBx26wAr7EAQYAiABEgLxh_D_BwE

 

[infinity]

If you're using ASCO it Accessory #47 for two wire ON/OFF control.

 

[Tulsa Electrician]

I use Eaton mech held. It will work with your set up.

 

[Tulsa Electrician]

This cut will ansawer your question on how it works.

Information available from Eaton

 

[hillbilly1]

Yeah, that’s the cheap one that requires you to use their module. Many names on those including GE, but I believe it’s actually made by ASCO.

I use Eaton mech held. It will work with your set up.

ts

 

[Sean.Day72]

Well that Eaton description was pretty much spot on. Thanks all

 

[Tulsa Electrician]

Your welcome

 

[hillbilly1]

The good thing about those, is it is easy to add or replace contacts, but surges take them out pretty easy, and short circuits burn the contacts easily. Also take care on installing the contact blocks. There is a normally closed and a normally open position depending on wether you install the block left or right.

 

[Tulsa Electrician]

Since I use them regularly what would you recommend for surge protection.
Thank you