[Collins] {Collins} 30L-1 relay

[Robert Jefferis]

The KA-11DG-110 is a very good, nearly direct sub for the original. I believe that the original relays supplied to Collins had a slightly custom spec requirement for pull-in voltage and contact gap. These subs work fine in 30L-1 and 32S-3, I have used them. For the 30L-1 check that the contact gap is at least .030" , preferably .035". If you can stand the price, the Deltrol relay offered by SSN is actually a higher quality replacement.

BTW, Newark no longer charges for credit card orders and there is no minimum. I use them all the time and the service is great (received an order just last week). For small orders, its actually easier to order by phone. $26 for that relay is about as good as you will find for new pieces. I don't have stock in Newark, just a happy repeat customer. I also use Allied and Mouser depending on part availability and price.

Bob KF6BC
On Dec 6, 2009, at 9:13 AM, Dr. Gerald N. Johnson wrote:

> On Sun, 2009-12-06 at 14:54 +0000, J ALLEN CALL wrote:
>> 
>> Hi Jerry:  I have been following the thread on the Collins 30L-1 relay
>> and the URL
>> that was sent indicates that the relay is a plug-in type. As far as I
>> know the 30L-1
>> relay is not a plug-in.  It is mounted underneath the chassis with
>> a washer and a nut.
>> Correct me if I am wrong.  Maybe the round emblem uses a plug-in!
>> 
>> http://parts.digikey.com/1/parts/752274-relay-gp-10a-dpdt-110vdc-
>> krpa-11dg-110.html
>> 
>> J
>> W7KSG
>> 
> 
> You are correct. The KRPA is the KA relay in an octal plug in package.
> Inconvenient to use in the 30L-1 because its bigger or after you extract
> the works from the case, there's no mounting stud, though there's a
> chance there might be a mounting screw hole.
> 
> I've dug further instead of going along with posts to the list which
> maybe I should have done before.
> 
> The Collins part number is 970-2140-00. I think that essentially is a
> P&B KA-11DG-110. Mouser wants 23 minimum order Digi-Key wants 35, but
> Newark On-Line has 39 in stock this morning at $26.51. Last time I dealt
> with Newark they added $3 per transaction to use a credit card. Caveat
> emptor! but they have the part.
> 
> As for alternatives, the DC relay has a 10,000 ohm coil. The 240 volt AC
> relay coil in this line is 9,110 ohms. That should work fine, but there
> might be a slight delay on operation because of the damping ring that
> keeps the AC relay from buzzing. Probably not more than 10 or 20
> milliseconds delay though. That would be a KA-11AG-240.
> 
> The KU family is very close. And there are variations in mounts,
> primarily the stud length (or hole depth) and the spacing to the
> alignment lug. There are also variations in the connection lug width.
> For our purposes, the KU-11D(1,3,4)(5,7,K)-110 are workable equivalents.
> E.g.: KU-11D15-110, KU-11D35-110, KU11D45-110, KU-11D17-110, etc.
> 
> And also the KU-11A(1,3,4)(5,7,K)-240 which is the AC coil of 9110 ohms.
> 
> The KUP are the KU in a rectangular case without mounting but the same
> connection as the KU. They would need a cobble for mounting, like a
> strap around the plastic case. They are much more commonly available.
> 
> Numbers I found this morning: KUP-11A15-240. Mouser has 2, DK has 17.
> KUP-11D15-110. Mouser has 4 at $9.64, DK has 24.
> KUP-11D35-110. Mouser has 10.
> 
> In the NTE catalog I found the R06-14D10-110 that is quite close to the
> KA except it has three poles in the same package size. Mouser shows
> three in stock at $27.63. That second digit is a zero.
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
> 
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