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cl60 equivalent
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Old 28th May 2011, 04:45 AM   #11
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cl60 equivalent
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Originally Posted by giulia67 View Post
The 5 amp rated CL60 is that for transformers with 5amp RMS output? Do you just solder one leg on each of the primary leads on the transformer on a 120 volt ac? Thanks
it's easier to look at schematics

NTC goes in-line with one primary lead
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Old 28th May 2011, 07:36 AM   #12
giulia67 is offline giulia67  United States
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I schematic would be better, but have no idea where to get or look at one. So it breaks the circuit at one primary lead on a 120volt ac. What happens if your transformer puts out more than 5 amps? In another amp I have a 3.6KV toroid? Thanks
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Old 28th May 2011, 08:00 AM   #13
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you're in Pass forum

look at any of First Watt or Pass Labs schematics , spread out here - or on First Watt site

there you'll find needed info

point is - say that you can imagine NTC connected in same manner as fuse , so both fuse and NTC are in series with mains leads

for 3,6KW toroid you really need soft start , with more than 10 ohms resistance for cold state

some schematics from Elektor are already common knowledge

TOROIDAL TRANSFORERS - Soft Start

even then - I recommend using NTCs in series instead of fixed resistors

that way start is even softer , without possible abrupt in moment when series resistors are shorted with relay
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Old 28th May 2011, 12:09 PM   #14
Bksabath is offline Bksabath  United Kingdom
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Hi there

I have also sourced equivalent to CL60 from Farnell

With a 1000 VA I found that I need 2 in series (not good practice as one may get hotter as it does al the work and the other Just sit there) or larger fuses but I rather have a fuse that blows up when needed.

I am using a relay to BY pass them after a few seconds enclosed first SCH same resistors values need work out

Holco MFR 15ppm 2W for sale
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Old 28th May 2011, 01:02 PM   #15
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cl60 equivalent
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........ 2 in series (not good practice as one may get hotter as it does al the work and the other Just sit there) .......l[/url]
it will happen with parallel ones

series is OK , at least regarding current (non)sharing ...... because there is nothing to share

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Old 28th May 2011, 01:44 PM   #16
giulia67 is offline giulia67  United States
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There is a CL30 which is rated at 8 amps. Have not seen any rated higher. Maybe that helps you
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Old 28th May 2011, 02:53 PM   #17
Bksabath is offline Bksabath  United Kingdom
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Tanks Zen

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Old 3rd January 2018, 06:05 PM   #18
quyda is offline quyda  Viet Nam
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Hi,

Im building F5 Amp and looking for CL60 equivalent for my 350W 220V transformer (dual 0-110v primary)
Should I get a Epcos NTC, 10R/5A or 10R/7.5A?

Thanks
Q
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Old 3rd January 2018, 07:12 PM   #19
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more the merrier
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Old 5th January 2018, 06:30 PM   #20
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by quyda View Post
Hi,

Im building F5 Amp and looking for CL60 equivalent for my 350W 220V transformer (dual 0-110v primary)
Should I get a Epcos NTC, 10R/5A or 10R/7.5A?

Thanks
Q
10r won't do much limiting in a 220Vac system.

10r is excellent for 110Vac systems.
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