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MEXICOWANDERER's avatar
MEXICOWANDERER
Explorer
May 31, 2016

Excellent Value 120vac DPDT 30-Amp Relay

http://www.mpja.com/05-31-16.asp?r=386312&s=2



Stock No: 32886 RL

$10.95

Availibilty: In Stock Units: 197

This is the relay I used for Quicksilver. Two relay COILS can be connected in series for 240 volt operation. EACH relay contact is rated for THIRTY AMP continuous service. One relay can be used for 30-amp shore power/generator auto transfer. Two relays can provide dedicated 30 ampere 240 volt service. One contact EACH relay for neutral. Breaker EACH relay neutral for 30-amps.

For X-tra heavy duty service I used double relays for 30 amp shore power.

Compared to most relays I have seen in modern motorhomes these guys are light-years superior in capacity and longevity. Contacts are silver-cadmium flashed, and connections are flat blade screw.

The price is one-third to one-fourth that normally found.

The fishing vessel Kelley II, uses EIGHT of these relays for high amperage 3 phase 4-wire, shore / generator power.
  • brulaz's avatar
    brulaz
    Explorer
    May 31, 2016
    That *is* a good price.
    Think I paid ~US$50 for mine.

    Mine has started buzzing a little recently, but that could be just how I mounted it. Need to open the case and tighten things up.
  • CA_Traveler's avatar
    CA_Traveler
    Explorer III
    Jun 01, 2016
    Looks great but kinda Old School don't you think Mex? :h

    Please explain what US RV uses a 120/240V 30A pedestal??? Now 50A and I'd understand??? Mexico and 120/240V 30A, OK always willing to learn. :C
  • Chris_Bryant's avatar
    Chris_Bryant
    Explorer II
    Jun 01, 2016
    Tom_M wrote:
    smkettner wrote:
    I like the small cover.
    OK it is twice the price but 50a rated.

    http://www.ebay.com/itm/NEW-50A-DPDT
    Nice relay but coil voltage is 120 volt DC. Adding a diode to the coil voltage may work.


    I prefer DC for generator transfers- keeps the coil from chattering on shutdown. Only trouble is rectifying 120 volts AC yields somewhere above 120 vdc, I believe.
  • brulaz's avatar
    brulaz
    Explorer
    Jun 01, 2016
    Tom_M wrote:
    I purchased one of these from Grainger:

    120 VAC 30 amp DPDT power relay



    If I'm reading the specs right, the spring held NC contacts on this only have a 3A rating. Guess you need the strength of electromagnet to hold the NO contacts contacts closed to get the 30A rating?
  • brulaz's avatar
    brulaz
    Explorer
    Jun 01, 2016
    CA Traveler wrote:

    ...
    Please explain what US RV uses a 120/240V 30A pedestal??? Now 50A and I'd understand??? Mexico and 120/240V 30A, OK always willing to learn. :C


    You're joking, right?

    Never owned a 50A rv ...
  • brulaz's avatar
    brulaz
    Explorer
    Jun 01, 2016
    Tom_M wrote:
    smkettner wrote:
    I like the small cover.
    OK it is twice the price but 50a rated.

    http://www.ebay.com/itm/NEW-50A-DPDT
    Nice relay but coil voltage is 120 volt DC. Adding a diode to the coil voltage may work.


    That store sells one with 120VAC coil but it's about the same price I paid, ~$60.

    And for $69 on Amazon you can get a Progressive Dynamics transfer switch in a nice big electrical box with strain relief’s and a time delay. That's what I would do if I were to do it over again.
  • CA_Traveler's avatar
    CA_Traveler
    Explorer III
    Jun 01, 2016
    brulaz wrote:
    CA Traveler wrote:

    ...
    Please explain what US RV uses a 120/240V 30A pedestal??? Now 50A and I'd understand??? Mexico and 120/240V 30A, OK always willing to learn. :C


    You're joking, right?

    Never owned a 50A rv ...
    There are 3 standard RV connections in the US and Canada - 20A and 30A, both 120V and 50A which is 120/240V. :C

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