UL 248-1:2000 pdf download Low-Voltage Fuses – Part 1: General Requirements
1General
1.1 Scope
1.1.1 This Standard applies to low-voltage fuses rated 1000 V or less, AC and/or DC, with interruptingratings up to 200 kA. These fuses are intended to be used in accordance with the Canadian ElectricalCode, Part 1(CEC), and the National Electrical Code, NFPA 70 (NEC).
1.2 Object
1.2.1 This Standard and its subsequent Parts establish the characteristics, construction, operatingconditions, markings, and test conditions for each of the fuse classes so that initial investigation andfollow-up verification can be performed in an orderly manner.
2 Definitions
The following definitions apply in this Standard.
Note: The Clauses in Definitions, Clause 2, are numbered corresponding to the Clause numbers for definitions for the similar itemscontained in the international Eectrotechnical Commission, Publication 269-1: Low-voltage fuses,Part 1: General requirements.Some Clause numbers are ommitted.
21 Fuse
2.1.3 Fuse
A protective device which opens a circuit during specified overcurrent conditions by means of a currentresponsive element.
2.1.3.1 Body
The part of the fuse which encloses the fuse elements and supports the contacts. Also referred to ascartridge, tube,or case.
2.1.3.2 Filler
Material used to fil a section or sections of a fuse.
2.1.4 Contacts
The external metallic parts of the fuse used to complete the circuit. Also referred to as ferrules, caps,blades.or terminals.
2.1.5 Element
The fusible portion of the fuse which acts, during an overcurrent condition, to clear the circuit: also referredto as a link.
2.1.51 Renewal element
The part of a renewable fuse that is replaced after interruption to restore the fuse to operating condition.
2.2 General terms
2.2.2 Current-limiting fuse
A fuse that, within a specified overcurrent range, limits the clearing time at rated voltage to an intervalequal to or less than the first major or symmetrical current loop duration: and limits the peak current to avalue less than the available peak current.
2.2.5.1 Ambient temperature
The temperature of the air surrounding the fuse.
2.2.7.1 Low melting point fuse
A fuse that will open in an ambient temperature of 200 C when carrying 10 percent of rated current.
2.2.7.2 Microfuse
A supplemental fuse, the body of which has no principal dimension exceeding 10 mm (0.4 in), excludingthe leads or terminals.
Note: Principal dimensions are length, width, height, and diameter.
UL 248-1:2000 pdf download
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