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BS1362 Plug-top Fuse - Peak Cut-off Current

MW (aka Inrush - for those who remember me!)
Hi,


It appears that finding technical data for what must be the most widely used/produced fuse in the UK is surprisingly difficult. I have the Bussmann time-current curves for BS1362 (plug top) fuses. However, I'm unable to get the energy let-through and peak cut-off current graphs (Bussmann's technical dept. doesn't have this). Therefore, I was hoping someone on the forum could help.


The data I require doesn't have to be for Bussmann's BS1362 fuses. This could be for another manufacturer, e.g., Marbo. However, in that case I'd also (ideally) need the time-current curve. I would try Marbo's technical, but I'm unable to find contact details for this company. Does anyone have an old BS1362 datasheet with this information (that's been tucked away for the last 30 to 40 years)?


Many thanks in advance ?
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  • 0
    I would partly agree with this (in disagreeing with the statement "We cannot assume any energy limiting action") as the way fuses work is inherently energy-limiting. It takes a certain amount of energy to blow the fuse and energy in excess of this will not be let through. However if it was slightly reworded as "we cannot assume a known energy limiting action" I would agree with it.

    My only problem with Mike's method of calculation is I suspect it falls down at very high currents. Because the fusible link inside the fuse melts, at extremely high currents it will let more energy through as the arc is extinguished than at lower currents. However the time current calculation breaks down when you get below the duration of a half cycle (10ms) as the current doesn't (or at least may not) reach the peak prospective short circuit current as it is interrupted while still rising.

    Alasdair
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  • 0
    I would partly agree with this (in disagreeing with the statement "We cannot assume any energy limiting action") as the way fuses work is inherently energy-limiting. It takes a certain amount of energy to blow the fuse and energy in excess of this will not be let through. However if it was slightly reworded as "we cannot assume a known energy limiting action" I would agree with it.

    My only problem with Mike's method of calculation is I suspect it falls down at very high currents. Because the fusible link inside the fuse melts, at extremely high currents it will let more energy through as the arc is extinguished than at lower currents. However the time current calculation breaks down when you get below the duration of a half cycle (10ms) as the current doesn't (or at least may not) reach the peak prospective short circuit current as it is interrupted while still rising.

    Alasdair
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