Fuse protection of 84 137 020
Posted 06 April 2006 - 04:33 AM
Can the 13A mains fuse ( high breaking capacity of 6000A @ 250VAC, fast blow type ) be used for this application.
Please be informed that we cannot find I2t value for the mains 13A fuse ( RS stock number is 412-605, www.rshongkong.com ), but the I2t is surely different from the breaking capacity ( the units of them are different and specifications of RS# 420-145 also have different values: breaking capacity of 1500A and I2t of 26 ).
Please advise the relation between I2t and the max. non-rep. 1- cycle surge. To my understanding,
if t = 20 ms ( 1 cycle of 50 Hz ), then I2t = IxIx 0.02 = 3042 ( for 50 Hz ), then I = 390, then 1 cycle surge shall be 390 A instead of 780 A ( exactly double of the calculated value );
if t = 16.67 ms ( 1 cycle of 60 Hz ) , then I2t = IxIx 0.01667 = 2535 ( for 60 Hz ), then I = 390, then 1 cycle surge shall be 390 A instead of 780 A ( exactly double of the calculated value ).
If we cannot find the I2t value of the fuse, and not practical to change the 50A SSR to 75A SSR ( hundreds of 50A SSR are being used ), can you recommend fuse ( breaking capacity, rating and type ) for protection of the SSR.
Thank you very much!
Posted 06 April 2006 - 08:06 AM
Posted 06 April 2006 - 10:21 PM
Thanks a lot!
Posted 10 April 2006 - 07:01 AM
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