An alternative to using 30amp relays?

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mikeshonda750

Copper - Posts: 105

Joined: December 03, 2003

Location: United States

Posted: December 13, 2003 at 9:44 PM / IP Logged

Hey guys, just wondering... is there an alternative to using standard SPDT 30amp relays? Such as a SPDT10amp relay. Or possibily a different type of relay you could use for positive door locks, or any door lock system that normally requires more than 1 SPDT30amp?

Reason i ask is, it seems like such a waste to operate door lock motors that run at or less than 10amps with a 30 amp relay. They are also a bit cheaper. These relays would be fused with a 10amp fuse, so if anything was to go horribily wrong, or someone was to overwork the power door locks(sitting on the keys), the worst that would happen is you would blow a 10amp fuse.

What I figure is... if you spend 6-7$ per relay... If you do 5 installs wich each require 2 relays... thats 60-70$.. what if you could reduce your costs to 30-40$ and not loose an ounce of effectiveness?

Or better yet.... is there a relay out there that will switch in 2 directions? You would still have your relay powered the same.. but would have 2 extra pins.. 1 for an input trigger and 1 for the output of that trigger..... and when the relay is at rest.. each trigger output would rest? just wondering

Teken

Gold - Posts: 1,492

Joined: August 04, 2002

Location: Aruba

Posted: December 13, 2003 at 10:28 PM / IP Logged

I cannot speak as to where you purchase your electrical supplies. But the average 20/30 & 30/40 SPDT relay can be purchased on-line with out bulk purchase for $0.99 USD.

An additional female 5 pin harness is only another $1.59 USD.

Add the two together, and that nets you $2.58. If you factor in S&H and duties with a minimum bulk purchase of 50-100 units.

The total costs would still be below $3.50

========================================================

In regards to your Q about using only a 10 amp relay, opposed to a 30 amp unit. With any addition(s) into a vehicles system. The technician or the designer must provide a measure of headroom, or current over draw.

Over time window regulator current draw increases during colder months, and window track friction increases due to dirt and contamination, and no less from water, and ice & snow.

Unlike a fuse where you want to have the closest possible margin for terminal failure for the open condition.

You do not want to have a relay to over draw, which in the business world means call backs, and loss of time and revenue.

Bottom line... Apply a standard 30/40 amp relay in the most basic of installations and you will have long term performance, without the long term effects of on going failures.

Regards

EVIL Teken . . .

mikeshonda750

Copper - Posts: 105

Joined: December 03, 2003

Location: United States

Posted: December 13, 2003 at 10:43 PM / IP Logged

Wow! Thanks for the info Teken! The price side of it totally kills the idea of using a cheaper relay. Hell, i thought i was getting a good deal buying them at radio shack at 6$ a peice compared to 12-15$ each from our parts supplier. Will pass this information along. Guess I (we) shoulda invesdigated it a little more and would have found better prices, equalling in more raw profit, making life for me much more enjoyable!

Thanks Teken!

Teken

Gold - Posts: 1,492

Joined: August 04, 2002

Location: Aruba

Posted: December 14, 2003 at 12:13 AM / IP Logged

www.partsexpress.com is one of 30 companies that sell the relays at a reasonable price point.

www.alleletronics.com is also another reliable vendor which does not try to screw you over with high S&H charges.

There are alot more companies out there, simply look them up in the commercial sections in the internet yellow pages.

Regards

EVIL Teken . . .

NowYaKnow

Gold - Posts: 1,217

Joined: December 18, 2002

Posted: December 14, 2003 at 3:05 AM / IP Logged

Yeah standard relays we use are too cheap to really justify finding a good alternative until something obvious comes along. By the way the link above should be allelectronics.com if you didn't catch the spelling error..The only nice thing would be if standard relays were a little bit smaller. If you take apart pretty much any alarm/remote start/keyless brain you will see they are not using standard relays like we throw in. You could open one up and try to source the some relays they use, but these relays won't be very user friendly and are more geared toward circuit board type use. Hey if you find something better feel free to pass it on but until then I'd stick with the normal relays..Good luck,

Mike

Teken

Gold - Posts: 1,492

Joined: August 04, 2002

Location: Aruba

Posted: December 14, 2003 at 4:35 PM / IP Logged

LOL, Oooooooooops... My bad, thanks for correcting that link. An alternative to using 30amp relays? -- posted image.

Regards

EVIL Teken . . .

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An alternative to using 30amp relays?

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