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Fuse Type ELECTRONIC FUSE_ MICRO FUSE_ RESETTABLE FUSE by suchenfz

VIEWS: 28 PAGES: 5

									FUSE SPECIFICATIONS                                             2004/08/31Weng
http://www.circuitprotection.ca/htmls/GGX.html


Fuse Type: Automotive Fuse, Electronic Fuse, Micro Fuse, Resetable Fuse.




Automotive Fuse:
   Material: Plastic/Glass
   Acting: Normal Duty/Fast Acting/Time Delay
   Physical Size: Plastic N/A, Glass 6.3*25.4, 6.3*30, 6.3*32, 10.3*38.1
   Axial Lead: No
   Ampere Rating: 10 A---500 A
   Voltage Rating: 32/48/250 V




ELECTRONIC FUSE:
   Material: Glass/Ceramic/Fiber-glass
   Acting: Normal Duty/Fast Acting/Time Delay/Lightening Withstand
    Physical Size: 3.6*10, 4.5*14.5, 5*20, 6.3*25.4, 6.3*30, 6.3*32, 10*35, 10.3*38.1
    Axial Lead: Yes/No
    Ampere Rating: 10 mA---60 A
    Voltage Rating: 60/250/300/350/600 V




MICRO FUSE:
   Material: Plastic/Ceramic
    Acting: Normal Duty/Fast Acting/Time Delay
    Physical Size: 2.5*7, 2.6*6.2, 8.5*8.4
    Axial Lead: Yes/No
    Ampere Rating: 40 mA---15 A
    Voltage Rating: 125/250 V




RESETABLE FUSE:
   Material: Polymer
   Acting: Resetable
   Physical Size: N/A
   Axial Lead: Yes
   Ampere Rating: Square type 0.9---9A, Disc type 0.1---3.75 A
    Voltage Rating: Square type 30 V, Disc type 60V


Fuse Standards:



         UL Listed
      This symbol, granted by the U.S. agency, guarantees that a fuse has been manufactured
in full compliance with the UL UL/CSA/ANCE (Mexico) 248-14 standard FUSES FOR
SUPPLEMENTARY OVERCURRENT PROTECTION (600 Volts, Maximum) (Former UL
198G and CSA C22.2, No. 59). Some of the requirements are as follows:
 UL ampere rating tests are conducted at 100%, 135%, and 200% of rated current. The
    fuse must carry 110% of its ampere rating and must stabilize at a temperature that does
    not exceed a 75C rise at 100%. The fuse must open at 135% of rated current within one
    hour. It also must open at 200% of rated current within 2 minutes for 0-30 ampere ratings
    and 4 minutes for 35-60 ampere ratings.
 The interrupting rating of a UL Listed fuse is 10,000 amperes AC minimum at 125 volts.
    Fuses rated at 250 volts may be listed as interrupting 10,000 amperes at 125 volts and, at
    least, the minimum values shown below at 250 volts.
                     Fuse Amperage, Fuse I.R., Fuse Rated Voltage,
                          Amp         Amp             Volt
                           0 to 1            35          250VAC
                          1.1 to 3.5       100            250VAC
                          3.6 to 10        200            250VAC
                         10.1 to 15        750            250VAC
                         15.1 to 30        1500           250VAC




           CSA Certification
     This symbol, granted by the Canadian agency, guarantees that a fuse or holder has been
manufactured in full compliance with the CSA C22.2 No. 248.14 or CSA C22.2 No. 39
standard respectively. It's equivalent to UL Listing in the U.S.A.




               SEMKO Approval
    This symbol, granted by the Swedish agency, guarantees that a fuse or holder has been
manufactured in full compliance with the appropriate section of the IEC 60127 standard.




                VDE Approval
    This symbol, granted by the German agency, guarantees that a fuse or holder has been
manufactured in full compliance with the appropriate section of the IEC 60127 standard.




             BSI Kitemark License
      This symbol, granted by the British agency, guarantees that a fuse has been manufactured
in full compliance with the appropriate section of the IEC 60127 (BS 4265) standard.




                    UL Recognition
     UL     Component Recognition Program allows the testing of components (including
fuses and holders) for which no UL standard exists or where only certain sections of a
particular UL standard are referenced. A fuse or holder may be submitted to UL for testing
according to criteria defined by the manufacturer. If basic safety requirements are met during
testing and the component performs as predicted, it can be UL Recognized. Normally, parts
bearing these marks are incorporated into equipment manufactured by an OEM and
determined based on the electrical characterisrics of the product designed to provide
protection for the components in the equipment. Fuses built to the European IEC 60127 fuse
standard (with SEMKO, VDE, and/or BSI approvals) are technically qualified to apply for UL
Recognition.




                MITI Approval (same as Dentori Approval)
     This symbol, granted by the Japan Electrical Testing Laboratory, guarantees that a fuse
has been manufactured in full compliance with the Japanese MITI standard. This document is
similar to UL 248-14 with subtle differences in voltage ratings and breaking capacity criteria.




                  International Electrotechnical Commission (IEC)
     The IEC organization is different from UL and CSA, since IEC only writes specifications
and does not certify. UL and CSA write the specifications, are responsible for testing, and give
certification. Certification to IEC specifications are given by such organizations as SEMKO
(Swedish Institute of Testing and Approvals of Electrical Equipment) and BSI (British
Standards Institute), as well as UL and CSA. IEC Publication 127 defines three breaking
capacity levels (interrupting rating). Low breaking capacity fuses must pass a test of 35
amperes or ten times rated current, whichever is greater, while enhanced breaking capacity
fuses must pass a test of 150 amperes and finally high breaking capacity fuses must pass a test
of 1500 amperes.


          60127 Part 2
          Sheet I - Type F Quick Acting, High Breaking Capacity
          Sheet II - Type F Quick Acting, Low Breaking Capacity
          Sheet III - Type T Time Lag, Low Breaking Capacity
          Sheet V - Type T Time Lag, High Breaking Capacity
          Sheet VI - Type T Time Lag, Enhanced Breaking Capacity


     The letters "F" and "T" represent the time-current characteristic of the fast-acting and
time delay fuses. One of these letters will be marked on the end cap of the fuse.


    UL/CSA/ANCE (Mexico) 248-14 vs. IEC 127 FUSE OPENING TIMES
(UL/CSA/ANCE (Mexico) 248-14 Was Previously UL 198G and CSA 2.2, No. 59)
          Percent UL & CSA IEC Type F IEC Type F IEC Type T IEC Type 5
         of Rating std 248-14 Sheet 1(*) Sheet 2(*) Sheet 3(*) Sheet 5(*)
              110        4 Hr.
                        60 Min.
              135
                         Max.
                                    60 Min.     60 Min.       60 Min.      60 Min.
              150
                                     Min.        Min.          Min.         Min.
                        2 Min.
              200
                         Max.
                                    30 Min.     30 Min.       30 Min.
              210                                                          30 Min.
                                     Max.         Max.         Max.
          (*) Note: The IEC Specification is only written up to 6.3A, any components above
     these ratings are not recognized by the IEC (although the fuses may have those opening
     characteristics).


     IEC also has requirements at 275%, 400% and 1000%; however, the chart is used to
show that fuses with the same ampere rating made to different specifications are not
interchangeable. According to the IEC 127 Standard, a one ampere-rated fuse can be operated
at one ampere. A one ampere-rated fuse made to UL/CSA/ANCE 248-14 should not be
operated at more than .75 ampere.


Fuse Selection Guide
      The fuse must carry the normal load current of the circuit without nuisance openings.
However, when an overcurrent occurs the fuse must interrupt the overcurrent, limit the energy
let-through, and withstand the voltage across the fuse during arcing. To properly select a fuse
the followings must be considered:
            Normal operating current (The current rating of a fuse is typically derated 25%
               for operation at 25C to avoid nuisance blowing. For example, a fuse with a
                current rating of 10A is not usually recommended for operation at more than
                7.5A in a 25C ambient.)
               Overload current and time interval in which the fuse must open.
               Application voltage (AC or DC Voltage).
               Inrush currents, surge currents, pulses, start-up currents characteristics.
               Ambient temperature.
               Applicable standards agency required, such as UL, CSA, VDE.
               Considerations: Reduce installation cost, ease of removal, mounting type/form
                factor, etc.

								
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