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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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 Posted: Thu Oct 29, 2020 7:37 am Post subject: SMOKED RELAY |
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I applied 12 volts to the coil of an automotive type relay to test it. Smoke
came out. I had forgotten that the relay contained an arc suppression diode.
As luck would have it, I connected the 12 volts to the coil with polarity
reversed. I can not buy an exact replacement part number CB1-D-12V
because it is obsolete. I am having trouble finding a compatible replacement
relay online. There are relays available with an internal resistor instead of a
diode. Is a resistor good enough? It is impossible to locate a diode
elsewhere in the circuit because it is sealed.
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Joe Gores |
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Ceengland
Joined: 11 Oct 2020
Posts: 380
Location: MS
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| Posted: Thu Oct 29, 2020 8:22 am Post subject: SMOKED RELAY |
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On 10/29/2020 10:37 AM, user9253 wrote:
| Quote: |
I applied 12 volts to the coil of an automotive type relay to test it. Smoke
came out. I had forgotten that the relay contained an arc suppression diode.
As luck would have it, I connected the 12 volts to the coil with polarity
reversed. I can not buy an exact replacement part number CB1-D-12V
because it is obsolete. I am having trouble finding a compatible replacement
relay online. There are relays available with an internal resistor instead of a
diode. Is a resistor good enough? It is impossible to locate a diode
elsewhere in the circuit because it is sealed.
--------
Joe Gores
Is it a typical 'cube' relay, as shown in this search?
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https://www.google.com/search?q=CB1-D-12V&rlz=1C1CHBF_enUS843US843&oq=CB1-D-12V&aqs=chrome..69i57.3184157j0j4&sourceid=chrome&ie=UTF-8
Does it still function (coil & contacts still good)? If so, if you can't
find a plug&play replacement you can simply splice a diode into the
wiring harness from the coil positive to coil negative wires, anywhere
in the circuit that's convenient.
The basic 'cube' style relay shows up in dozens of listings on ebay &
Amazon.
If your controlling switch is rated for 10A or so, the diode probably
won't make any difference in switch life (it should handle the
insignificant arc energy).
Charlie
--
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Charlie |
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Thu Oct 29, 2020 8:29 am Post subject: Re: SMOKED RELAY |
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Thanks Charlie. It looks like part number PB682-ND will replace the relay.
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Joe Gores |
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nuckolls.bob(at)aeroelect
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| Posted: Thu Oct 29, 2020 4:05 pm Post subject: SMOKED RELAY |
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| Quote: | I can not buy an exact replacement part number CB1-D-12V
because it is obsolete. I am having trouble finding a compatible replacement
relay online. |
It was probably discontinued for the risk
you've already experienced.
| Quote: | There are relays available with an internal resistor instead of a
diode. Is a resistor good enough? |
Yes . . . and the resistor is not polarity
sensitive and will work just fine.
Bob . . .
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