Pin and Sleeve Auxilliary / Pilot Contacts

[alyoshak24]

Hello All,

I am having a hard concept grasping the purpose Aux / Pilot Contacts have for pin and sleeve receptacles in 200 amp 480 3 phase 4 wire application (R/B/O + Green)....

According to this link here https://meltric.com/media/contentmanager/content/meltric-catalog-accessories-options-en.pdf

Auxiliary/Pilot contacts can operate secondary circuits on the inlet or receptacle side of the circuit. They make last and break first when the plug is engaged or disengaged from the receptacle. So what would be considered a secondary circuit here for example if we had a 200 amp receptacle in a 3 phase application for an arbitrary load ? I dont understand what the secondary circuits would be here if there is no neutral...maybe i am overthinking. Can you guys please help wrap my mind around this with examples, real world applications, videos, links etc.

 

[Shaneyj]

We use metric in oilfield. I’ve seen the aux used to signal a PLC or other data acquisition or supervisory system.
In one instance the break first was used to operate a shunt trip to open circuit before it gets unplugged accidentally.
The auxiliary can be used for anything really.


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[TwoBlocked]

We use metric in oilfield. I’ve seen the aux used to signal a PLC or other data acquisition or supervisory system.
In one instance the break first was used to operate a shunt trip to open circuit before it gets unplugged accidentally.
The auxiliary can be used for anything really.


Sent from my iPhone using Tapatalk

Yep, I've seen them to shut down a motor so if the plug is removed under load, you won't get a huge spark.

 

[LarryFine]

So what would be considered a secondary circuit here for example if we had a 200 amp receptacle in a 3 phase application for an arbitrary load ?

In your example, it could be as simple as using it to control a contactor so power cannot flow until the plug is fully inserted, and stops before the plug is fully removed.

You might also use it to activate a transfer switch, or start/stop something.