Bosch style relays?

farmer boy · Feb 20, 2012

I've noticed that there can be a large difference in the price of a relay. $7 up to $15. Are the $15 relays actually better or does it make no difference. Also wondering if it makes a difference which way the wires are hooked up. The switched power and ground are 85 and 86, which connects 30 and 87 together when energized. Could one hook up the always live power source to 87, ensuring that 87a could never becom energized? (if that was a concern)

pete 23 · Feb 20, 2012

I think the price difference might be due to diode's in some to prevent reverse voltage spikes in some applications when a solenoid is denergized in the circuit the relay is serving.

NCWayne · Feb 20, 2012

Try checking out Waytek Wire's site. They usually have pretty good descriptions and specs on everything they carry. Not to mention that their prices are typically about half or less of what you'll give for the same parts at your local supply house. Only thing is they have a minimum order but if you get several things together that you commonly use you can save alot of money by getting them all together in one order instead of buying seperately from the supply houses.
Waytek wire

JMOR · Feb 20, 2012

(quoted from post at 10:59:33 02/20/12) I've noticed that there can be a large difference in the price of a relay. $7 up to $15. Are the $15 relays actually better or does it make no difference. Also wondering if it makes a difference which way the wires are hooked up. The switched power and ground are 85 and 86, which connects 30 and 87 together when energized. Could one hook up the always live power source to 87, ensuring that 87a could never becom energized? (if that was a concern)

"Could one hook up the always live power source to 87, ensuring that 87a could never become energized?"

Yes.

PJH · Feb 20, 2012

I noticed that some of the Bosch relays that have the five pin configuration are SPDT, and some are SPST with both 87 and 87a tied together internally. On the ST version, hooking up the "always on" power to terminal 87 would also give you "always on" power to terminal 87a, and switched power to terminal 30. I've used a lot of the ST five terminal Bosch relays, not even knowing that the SPDT type were available.
Bosch style relays

PJH · Feb 20, 2012

And I forgot to mention - can you simply use a Bosch four terminal relay instead of the five terminal one. Four terminal has no 87a. It seems like I recently gave around five bucks each for Bosch relays at one of the local auto part stores.

Paul

Bosch style relays?

farmer boy

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pete 23

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NCWayne

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JMOR

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PJH

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PJH

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