ROBERT via EV wrote:
I ask again. Is it a relay or a contactor? And before you answer, remember
that a relay is tested to a different set of requirements than a contactor.
The problem with a solid state relay is not the failure mode but the fact
that a solid state device always has some level of leakage current. In other
words, a SSD cannot provide complete isolation from a source. Have you every
seen a UL listed (UL489) solid state branch circuit protection device?
Contactors are basically larger, more powerful versions of relays. You're right;
they are often tested to different standards, because of the power level and
consequences of failure can be more drastic.
A 120vac EVSE could use a relay. I have two, and they both use small inexpensive
relays.
A 240vac EVSE is higher power, and almost certainly would use a contactor. I
have one EVSE, and it has a contactor.
No way would I trust a solid-state relay for a safety disconnect!
--
Where ignorance is our master, there is no possibility of real peace.
-- Dalai Lama
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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