Hi Lisa:


>   If I want to substitute a 1.6A, 250VAC,slow-blow, with the same opening
>   time,
>   same Interrupting Rating, VDE, UL, SEMKO approved fuse with another
>   with the same ratings and approvals EXCEPT that the nominal cold resistance
>   and
>   nominal melting temperatures are slightly different (one more specifically
>   designed for surge)
>   is this interchange allowed under 61010?  

The basic requirement is that the fuse must be
certified, and that the fuse certification must 
be accepted by your certification house.

The parameters you mentioned, cold resistance
and melting temperatures, are usually not 
controlled by fuse certification.  

Indeed, you should be able to use ANY 1.6-amp,
250 V fuse in your application provided the 
fuse certification is accepted by your cert
house.

Slow-blow, cold resistance, melting temperature,
and similar parameters can be selected so as to
prevent nuisance fuse operation.  The major
parameters, 1.6 amps and 250 volts are what 
provide protection in the event of a fault.


Best regards,
Rich




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