This part of IEC 60127 relates to universal modular fuse-links (UMF) for printed circuits and other substrate systems@ used for the protection of electric appliances@ electronic equipment@ and component parts thereof@ normally intended to be used indoors.It does not apply to fuse-links for appliances intended to be used under special conditions@ such as in a corrosive or explosive atmosphere.These fuses are normally intended to be mounted or replaced only by appropriately skilled persons using specialized equipment.Fuse-links for use in fuse-holders are under consideration.This standard applies in addition to the requirements of IEC 60127-1.The objectives of this part of IEC 60127 are as given in IEC 60127-1@ with the additional requirement of a degree of non-interchangeability.