shortcircuit1
Senior Member
- Location
- USA
This might be a stupid question but can we use relays instead of breakers in service entrance ATS's? If so are there any service rated relays?
Service entrance relays?
- Thread starter shortcircuit1
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LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Some ATS's use relays (called contactors in bigger sizes), but these must still incorporate a mechanism that physically prevents simultaneous energization, not merely by the electrical circuit arrangement.
Coppersmith
Senior Member
- Location
- Tampa, FL, USA
- Occupation
- Electrical Contractor
A service rated ATS will still require a main breaker. It becomes the service disconnect when placed ahead of the panel.
While small manual transfer switches use double-throw switches and a separate set of breakers to switch between utility and generator feed, an ATS will always use a contactor to perform this function. (At least, I have not seen any that don't.)
While small manual transfer switches use double-throw switches and a separate set of breakers to switch between utility and generator feed, an ATS will always use a contactor to perform this function. (At least, I have not seen any that don't.)
- Location
- San Francisco Bay Area, CA, USA
- Occupation
- Electrical Engineer
ATS's require specific UL listings in most jurisdictions.; UL1008. You cannot "roll your own".
romex jockey
Senior Member
- Location
- Vermont
- Occupation
- electrician
no, ergo i normally find a way to introduce a main before the ats
~RJ~
~RJ~
shortcircuit1
Senior Member
- Location
- USA
Thanks everyone for your input. Issue that i am having is i am trying to coordinate the breaker in the ATS with utility fuse and its really hard to do so. Thats why i was thinking why cant we use relays just like we do in medium voltage switch gear and make the coordination lot better?
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