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Offline tweeter  
#1 Posted : 08 March 2023 10:03:16(UTC)
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tweeter

Spain   
Joined: 02/03/2023(UTC)
Posts: 13
Location: Andalucia, Sevilla
Hello, what is the difference among these transformers?

Regards
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Offline H0  
#2 Posted : 08 March 2023 10:36:41(UTC)
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H0


Joined: 16/02/2004(UTC)
Posts: 15,262
Location: DE-NW
Who knows?

66471 has a power switch in the cable.
66470 may have protection against reverse transformation inside, but not sure about that.
6647 is good enough for digital locomotives, but requires a distribution panel with a switch and should be used with the reverse transformation problem in mind.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
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Offline tweeter  
#3 Posted : 08 March 2023 10:42:23(UTC)
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tweeter

Spain   
Joined: 02/03/2023(UTC)
Posts: 13
Location: Andalucia, Sevilla
Originally Posted by: H0 Go to Quoted Post

6647 is good enough for digital locomotives, but requires a distribution panel with a switch and should be used with the reverse transformation problem in mind.

ummm, not sure what does mean
I´m searching one to feed a running test bench, is it ok for that?
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Offline H0  
#4 Posted : 08 March 2023 10:53:58(UTC)
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H0


Joined: 16/02/2004(UTC)
Posts: 15,262
Location: DE-NW
The 6647 is OK for testing. Pull the plug or turn off with an external switch when not in use. It always draws power when plugged in - like Märklin transformers always did for decades.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
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Offline kiwiAlan  
#5 Posted : 08 March 2023 12:40:28(UTC)
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kiwiAlan

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Joined: 23/07/2014(UTC)
Posts: 8,101
Location: ENGLAND, Didcot
Originally Posted by: tweeter Go to Quoted Post
Originally Posted by: H0 Go to Quoted Post

6647 is good enough for digital locomotives, but requires a distribution panel with a switch and should be used with the reverse transformation problem in mind.

ummm, not sure what does mean
I´m searching one to feed a running test bench, is it ok for that?


It is only a possible problem when using two transformers on a layout. There is a configuration where it is possible to connect the secondaries in a way that can give an electric shock if one of the transformers is unplugged.

But using just one on a test bench will be fine.
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