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10-07-2019 #1
I think the price difference could be related to the current ratings 16 amp versus 6 amp.
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11-07-2019 #2
No, it's because RS Pro is an "in house" brand which by definition is less expensive than a main line industrial product. The cost difference between 6A and 16A contacts is only a small part of the total.
Here's a 6A nd 16A, both by RS Pro. Not such a bit difference. https://uk.rs-online.com/web/c/autom...949,4294572463
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11-07-2019 #3
what about those soft starters for the toroidal transformers ?
www.ebay.ie/itm/Inrush-current-limiter-230V-16A-for-transformers-power-supplies-LED/231650038237
www.ebay.ie/itm/Soft-start-inrush-current-limiter-for-toroidal-transformers-assembled-tested/132765338869
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11-07-2019 #4
Thanks, guys. I have just wired the AC to DC transformer bits together for the first time and connected it to the mains. I have not yet used a 'delay on' timer relay and just wired an NTC thermistor on the live between mains in and the primary winding. On first switch on nothing dramatic happened and I am getting 53 volts at the DC output which is close to what I wanted. I was surprised that the thermistor did not get hot like I thought they were supposed to. Could this be because there is no load on the DC output? Similarly the bridge rectifier does not seem hot or even warm. Is this normal? The thermistor is a SL15 2R507 that Airlink transformers recommend for toroidals up to 1kVA
Regards ...ChrisLast edited by chillybo; 11-07-2019 at 05:00 PM.
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11-07-2019 #5
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11-07-2019 #6
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12-07-2019 #7
The second one looks like a bit of a home project, TBH. The first (German) one looks pretty sensible, containing an NTC, timer relay and overtemp protection.
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13-07-2019 #8
In post 10 ,the second link for the
"Soft-start, inrush current limiter for toroidal transformers-assembled, tested"
reminded me of project 39 from Elliott Sound Products
Soft-Start Circuit For Power Amps
http://sound.whsites.net/project39.htm
project list
http://sound.whsites.net/p-list.htm
John
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