Page 324 - Ferraz semiconductor DIN
P. 324

Semiconductor fuses
                                                   Semiconductor (AC) fuses


                                                                            Other Protistor Fuses
                                                                                                      ®
                                                                                           Ferrule Fuses
                                                  14x51 gRC(URC) - 600 V to 690 VAC






                 Total clearing I t                                    I t corrective factor
                                      2
                                                                        2
                                                                    K
                   I t (A s)
                      2
                   2
                                                                    1.4
             10  5                                                  1.2            1   2         Mean curves showing
                                        10 ms (5 ms)  10 ms (2,8 ms)  8 ms (2 ms)  7 ms (1,5 ms)  6 ms (1,3 ms)  5 ms (1 ms)  4 ms (0,8 ms)  3 ms (0,6 ms)  2 ms (0,4 ms)  1,5 ms (0,3 ms)  1 ms (0,2 ms)  1.0  var-iation of  total clearing
                                                                                                 time (I 2 t ) and total clea-
                                                                                                      t
                                                                    0.8
                                                                                                 ring duration Tt as a func-
                                                                                                 tion of operating voltage U.
                                                                    0.6
             10  4                                                                               1- 63 A rating - 600 V
                                                                    0.4                          2- 1 to 50 A rating - 690 V
                                                                    0.2
                                                            50-63 A
                                                                     0
             10  3                                          40 A      0        200      400      600       800  U (V)
                                                                      Peak arc voltage
                                                            32 A
                                                            25 A
                                                            20 A       Um (V)
             10  2                                          16 A
                                                            12 A   1600
                                                                                     2             Curves showing peak
                                                            10A
                                                                   1400
                                                            8 A                                    value Um of arc voltage
                                                                                        1
                                                            6 A    1200                            which appears across
               10                                                  1000                            fuse-link as a function of
                                                                                                   operating voltage U @
                 10        10  2     10  3     10  4
                                                           Ip (A)   800                            cos ϕ = 0.15
                                                                                                   1-63A rating 600V
             Horizontal curves show maximum values of total clearing I t (I t ) for each  600
                                                      2
                                                        2
                                                         t                                         2-1 to 50A rating 690V
             rated current as a function of prospective current Ip @ 690 V. cosϕ = 0.15
             (for 63 A @ 600 V. cosϕ = 0.15).
             Oblique lines indicate total clearing duration Tt, with associated pre-arcing
             duration in brackets.
                                                                      0          200       400        600        800  U (V)
                 Current limitation curves
                   I (A)                                             I (A)
                   C
                                                                     C
             10  4
                                                                                       Ic = 2.5  Ip  Ic =   2  Ip  63
                                                                                                               50
                                                                                                               40
                                 Ic = 2.5  Ip                                                                  25
                                                                                                               32
                                                                                                               20
                                                                                                               12
             10  3                    Ic =   2  Ip          4 A                                                16
                                                                                                               10
                                                                                                               8
                                                            2 A                                                6
                                                            1 A

             10  2






               10

                 10        10  2     10  3     10  4               10        10  2     10  3     10  4
                                                           Ip (A)                                            Ip (A)
                Curves show, for each rating, value of peak let-through current IC as a function of available fault current Ip.

                                                          SCAC176                                              12/04
   319   320   321   322   323   324   325   326   327   328   329