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Old 15th June 2007, 02:24 AM   #1
ozonek is offline ozonek  China
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Question Is MUR3060 good for bridge rectifier?

I have 8 MUR3060 and plan to build a 100Wx2 amplifier. Is this device a better choice over the KBPC3510 bridge rectifier?

MUR3060 is the high current version of MUR860. (30A, 600V) and this device has 3 legs which are two diodes in parrallel.

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Old 15th June 2007, 05:00 AM   #2
sandyK is offline sandyK  Australia
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Default Is MUR3060 good for bridge rectifier

Generally these fast devices have a much lower surge rating than the KBPC3510. Look at this parameter in their data sheets. If you have a lot of capacitance in the PSU, it may be worthwhile using some kind of surge limiter to reduce current for a short period on switchon. Otherwise the fast devices may fail, This has been reported in several forum postings.
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Old 15th June 2007, 10:54 AM   #3
ozonek is offline ozonek  China
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Is there any classic surge limiting circuit for the PSU if the ripple cap is over 10000uF ?
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Old 15th June 2007, 11:14 AM   #4
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Those diodes will be more than enough for a power amplifier of the power you want, without any surge protection. I run 20A diodes in a 1x400W system that I use for parties and have never had a problem.
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Old 15th June 2007, 01:10 PM   #5
djk is offline djk
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A 6A general purpose rectifier


has a 60hz surge current of 400A, the MUR3060 is only 150A (per leg).

A 2R5 inrush current limiter


works well in most audio amplifier applications. The 2R5 model is rated for 5A and less than 0R095 at that current. In very large amplifiers (above 100W/ch) you may want to short it out with a relay after a short delay.

I have lost 400A surge rectifiers with caps as small as 27,000F, it is also dependant on the resistance in your transformer windings (bigger transformers are harder on rectifiers).
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Old 15th June 2007, 05:43 PM   #6
lgreen is offline lgreen  United States
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Originally posted by ozonek
Is there any classic surge limiting circuit for the PSU if the ripple cap is over 10000uF ?

I've done this before-

Soft Start Circuit

Implemented in Krell Clone
Retired from DIY (2010) but still lurking now and again. My DIY audio projects- PartTimeProjects.com.
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