HIGHLIGHTS:
PSC
1250/1300 Volt SEMICONDUCTOR PROTECTION FUSES
Ferraz Shawmut 1250/1300V PSC fuse-links provide maximum
flexibility in equipment design and ultimate protection for today’s
power conversion equipment. These square body fuse-links are
available in four different body sizes, each size having four world-
wide acceptable mounting styles. The different mounting styles
and body sizes along with a broad range of ampere ratings allow
greatest flexibility in equipment design.
The Ferraz Shawmut PSC fuses have been engineered to provide
state-of-the-art protection for SCR’s, diodes, thyristors, GTO’s
and IGBT devices. They have pure silver die-cut elements
embedded in solidified sand which helps control arcing charac-
teristics for low I2t and high interrupting rating. All contact
surfaces are silver plated and all hardware is non-magnetic.
All fuse links are equipped with a low voltage trip-indicator. This
trip-indicator can operate a field mountable microswitch which is
easily mounted directly onto the fuse even while in service.
Choice of mounting styles gives wide choice for
equipment design
Broad range of ampere ratings in a given body
size for design flexibility
IEC 269-4 compliance for fuses for worldwide
semiconductor applications
*For Microswitch information see page J10
Extremely Fast Acting
Current Limiting
Very Low I2t
Worldwide Acceptability
Superior Cycling Ability
Features/Benefits
APPLICATIONS:
Protection of rectifiers,
inverters, DC drives, UPS
Systems, reduced voltage
motor starters, and other
equipment in globally
accepted applications
Part Number Designation:
12,5URD: European/IEC
Mounting Style/Approval
Tested @ 1.1 Vn
A130URD: North American
Mounting Style/Approval
Tested @ Vn
*Vn = rated voltage
AC: 50-1800A
650-1300 VAC
100 kA IR
DC: Consult Factory
Ratings
UL Recognized
Component
Sizes 70,71,72,73
tested to IEC 269.4
Approvals
A130 URD 71 I350
A.C.
Rated Volts
(130=1300V)
Class
70
Size 71
72
73
Mounting Types
Straight-blade LI
Straight-blade LLI
Flat-type, one hole (American) TTI
Indicator
Amp Rating
North American Reference Numbering System
12,5 URD 71 I 350
Rated Volts
(12,5=1250V)
Class
70
Size 71
72
73
Mounting Types
DIN 110 D11A
Flat-type, one hole (metric) TTF
Indicator
Amp Rating
European / IEC Reference Numbering System
D 78
* Contact technical services for applications data.
Outline Dimensions
PSC
1250/1300 Volt SEMICONDUCTOR PROTECTION FUSES
CATALOG DIMENSIONS - mm
NO. ABCDEFG
12,5 URD 70 D11A (50-250)
12 URD 70 D11A (280-315) 40 25 12.5 21 17 100.4 133.4
11 URD 70 D11A (350-400)
12,5 URD 71 D11A (160-450)
11 URD 71 D11A (500-550) 51 25 12.5 25.5 22.5 100.4 133.4
10 URD 71 D11A 630
12,5 URD 72 D11A (280-550)
11 URD 72 D11A 630 60 32 16 30 27 100.4 133.4
10 URD 71 D11A (700-900)
12,5 URD 73 D11A (315-630)
12 URD 73 D11A 700
11 URD 73 D11A 800 74.5 40 20 37.2 34.25 100.4 133.4
10 URD 73 D11A 900
9 URD 73 D11A 1100
European Blade DIN 110, Type D11A
J
72.5 MAX
(2.85)
FG
H
CB
A
D
E
5.03
(.2) A
4.7
D
A
E
A
6
10.5
10.5
CB
71
FG
H
6
(.24)
CATALOG DIMENSIONS - mm/(in)
NO. ABCDEFGHJ
A130 URD 70 LI (63-315)
A120 URD 70 LI 350
A130 URD 71 LLI (160-450)
A120 URD 71 LLI (500-550)
A110 URD 71 LLI 630
A130 URD 72 LI (280-550)
A120 URD 72 LI (800)
A110 URD 72 LI (700-800)
A130 URD 73 LI (315-700)
A120 URD 73 LI (800)
A110 URD 73 LI (900-1000) 74.5 40 20 37.2 34.2 98.8 132.4 157.4 15.9
A090 URD 73 LI (1400) (2.93) (1.57) (0.79) (1.46) (1.35) (3.89) (5.21) (6.20) (0.63)
A070 URD 73 LI 1600
A065 URD 73 LI 1800
North American Straight Blade, Types LI & LLI
Type D11A
Types LI and LLI
51 25 12.5 25.5 22.5 91.4 130.4 152.4 14.6
(2.01) (0.98) (0.49) (1.00) (0.89) (3.60) (5.13) (6.00) (0.57)
60 32 16 30 27 97.6 132.4 157.4 14.6
(2.36) (1.26) (0.63) (1.18) (1.06) (3.84) (5.2) (6.20) (0.57)
40 25 12.5 21 18 91.4 130.4 152.4 10.5
(1.57) (0.98) (0.49) (0.83) (0.71) (3.60) (5.13) (6.00) (0.41)
D 79
D
CATALOG DIMENSIONS - In/(mm)
NO. AB C
A130 URD 70 TTI (63-315) 1.57 1.00
A120 URD 70 TTI 350 (40) (25.4)
A130 URD 71 TTI (160-450) 2.01 1.19
A120 URD 71 TTI (550-630) (51) (30.2)
A130 URD 72 TTI (280-630) 2.36 1.50
A120 URD 72 TTI (700-800) (60) (38.1)
A130 URD 73 TTI (315-900)
A110 URD 73 TTI (1000)
A100 URD 73 TTI (1250) 2.93 1.81
A090 URD 73 TTI (1400) (74.5) (46)
A070 URD 73 TTI (1600)
A065 URD 73 TTI (1800)
PSC
1250/1300 Volt SEMICONDUCTOR PROTECTION FUSES
North American Flat Single Hole, Type TTI
72.5 MAX
(2.85)
74
(2.91)
B
A
C
5.03
(.20)
A5/16-18 x .23 DP
5/16-18 x .36 DP
3/8-16 x .36 DP
1/2-13 x .36 DP
European Flat Single Hole, Type TTF
CATALOG DIMENSIONS - In/(mm)
NO. AB C
12,5 URD 70 TTF (050-315)
11 URD 70 TTF (350-400)
12,5 URD 71 TTF (160-450)
11 URD 71 TTF (350-400)
12,5 URD 72 TTF (280-630)
11 URD 72 TTF (700-800)
10 URD 72 TTF (900)
8,5 URD 72 TTF (1000)
12,5 URD 73 TTF (315-800)
12 URD 73 TTF (0900)
10 URD 73 TTF (1000)
9,5 URD 73 TTF (1100)
9 URD 73 TTF (1250)
8,5 URD 73 TTF (1400)
6,6 URD 73 TTF (1600)
6 URD 73 TTF (1800)
40 26 M8 x 1.25 x 9 DP
51 30 M8 x 1.25 x 9 DP
60 38 M10 x 1.5 x 9 DP
74.5 46 M12 x 1.75 x 9 DP
SIZE
70 & 71
72
73
2X72
2X73
Standard Threaded Studs
Packaging: 6 pairs
REF. AND DIMENSION
PER PAIR OF STUDS
S 98 801 (HC M8 X 30 & M 8 X 35)
T 98 802 (HC M 10 X 30 & M 10 X 50)
V 98 803 (HC M 12 X 35 & M 12 X 50)
W 98 804 (HC M 10 X 50)
X 98 805 (HC M 12 X 50)
MAX STUD MOUNTING
TORQUE (Nm)
13
MAX NUT TIGHTENING
TORQUE (Nm)
FIG1 FIG 2 FIG 3
13.5 13.5 13.5
26 26 26
46 46 15
26 26 26
46 46 15
WEIGHT (g)
23
40
60
50
70
15
Types TTI and TTF
D 80
1250 Volt European/IEC Style Ratings and Application Data
PSC
1250/1300 Volt SEMICONDUCTOR PROTECTION FUSES
Pre-Arc Total I2t**Watts Loss Metric
Body Amp Rated I2t@ Rated @ Rated DIN 110 Tapped Single
Size Rating Voltage (A2s x 103)Voltage Current Catalog No. Catalog No.
(A2s x 103)(W) Type D11A Type TTF
50 1250 0.116 0.98 16 12,5URD70D11A0050 12,5URD70TTF0050
63 1250 0.21 1.7 26 12,5URD70D11A0063 12,5URD70TTF0063
80 1250 0.47 3.8 27 12,5URD70D11A0080 12,5URD70TTF0080
100 1250 0.83 6.7 30 12,5URD70D11A0100 12,5URD70TTF0100
125 1250 1.3 10.5 38 12,5URD70D11A0125 12,5URD70TTF0125
160 1250 2.55 21 45 12,5URD70D11A0160 12,5URD70TTF0160
70 200 1250 4.7 37.8 54/56 12,5URD70D11A0200 12,5URD70TTF0200
250 1250 9.6 77 58/61 12,5URD70D11A0250 12,5URD70TTF0250
280 1200 14 107 61 12URD70D11A0280 -
280 1250 14 107 64 - 12,5URD70TTF0280
315 1200 20 150 66 12URD70D11A0315 -
315 1250 20 150 72 - 12,5URD70TTF0315
350 1100 28 180 68/75 11URD70D11A0350 11URD70TTF0350
400 1100 39 254 81 11URD70D11A0400 11URD70TTF0400
160 1250 2.6 21 46 12,5URD71D11A0160 12,5URD71TTF0160
200 1250 4.7 38 54 12,5URD71D11A0200 12,5URD71TTF0200
250 1250 8.9 71 61 12,5URD71D11A0250 12,5URD71TTF0250
315 1250 16 130 73/76 12,5URD71D11A0315 12,5URD71TTF0315
350 1250 22 180 76/80 12,5URD71D11A0350 12,5URD71TTF0350
71 400 1250 38 310 76/80 12,5URD71D11A0400 12,5URD71TTF0400
450 1250 47 380 87/95 12,5URD71D11A0450 12,5URD71TTF0450
500 1100 68 440 90/100 11URD71D11A0500 11URD71TTF0500
550 1100 84 540 98/112 11URD71D11A0550 11URD71TTF0550
630 1000 125 810 105 10URD71D11A0630 -
630 1100 125 810 120 - 11URD71TTF0630
280 1250 10 84 72 12,5URD72D11A0280 12,5URD72TTF0280
315 1250 15 122 76 12,5URD72D11A0315 12,5URD72TTF0315
350 1250 21 170 77 12,5URD72D11A0350 12,5URD72TTF0350
400 1250 32.5 270 80 12,5URD72D11A0400 12,5URD72TTF0400
450 1250 44 360 87/89 12,5URD72D11A0450 12,5URD72TTF0450
500 1250 57 460 94/98 12,5URD72D11A0500 12,5URD72TTF0500
550 1250 68 550 110/120 12,5URD72D11A0550 12,5URD72TTF0550
72 630 1100 105 850 113 11URD72D11A0630 -
630 1250 105 850 125 - 12,5URD72TTF0630
700 1000 145 910 122 10URD72D11A0700 -
700 1100 145 910 140 - 11URD72TTF0700
800 1000 215 1400 125 10URD72D11A0800 -
800 1100 215 1400 146 - 11URD72TTF0800
900 1000 312 1800 130 10URD72D11A0900 10URD72TTF0900
1000 850 - - 136 - 8,5URD72TTF1000
315 1250 12 95 84 12,5URD73D11A0315 12,5URD73TTF0315
350 1250 17 140 86 12,5URD73D11A0350 12,5URD73TTF0350
400 1250 25 200 93 12,5URD73D11A0400 12,5URD73TTF0400
450 1250 35.5 290 99/100 12,5URD73D11A0450 12,5URD73TTF0450
500 1250 44 360 110/112 12,5URD73D11A0500 12,5URD73TTF0500
550 1250 57 460 116/120 12,5URD73D11A0550 12,5URD73TTF0550
630 1250 84 680 125/132 12,5URD73D11A0630 12,5URD73TTF0630
700 1200 110 900 135 12URD73D11A0700 -
700 1250 110 900 146 - 12,5URD73TTF0700
800 1100 190 1530 136 11URD73D11A0800 -
73 800 1250 190 1530 148 - 12,5URD73TTF0800
900 1000 250 1870 150 10URD73D11A0900 -
900 1200 250 1870 170 - 12URD73TTF0900
1000 900 370 2130 152 9URD73D11A1000 -
1000 1000 370 2130 174 - 10URD73TTF1000
1100 900 445 2470 168 9URD73D11A1100 -
1100 950 445 2470 208 - 9,5URD73TTF1100
1250 900 585 3050 186/200 - 9URD73TTF1250
1400 850 755 3700 210/228 - 8,5URD73TTF1400
1600 660 1430 5630 203 - 6,6URD73TTF1600
1800 600 2040 7600 206 - 6URD73TTF1800
** Watts loss data is published for both blade and tapped style mounting configurations.
When two watts loss values are shown this represents tapped/blade values respectively.
D 81
D
PSC
1250/1300 Volt SEMICONDUCTOR PROTECTION FUSES
1300 Volt North American Style Ratings and Application Data
Pre-Arc Total I2t**Watts Loss
Body Amp Rated I2t@ Rated @ Rated N.American Blade Tapped Single
Size Rating Voltage (A2s x 103)Voltage Current Catalog No. Catalog No.
(A2s x 103)(W) Type LI Type TTI
63 1300 0.21 1.8 26 A130URD70LI0063 A130URD70TTI0063
80 1300 0.47 4 27 A130URD70LI0080 A130URD70TTI0080
100 1300 0.83 7.2 30 A130URD70LI0100 A130URD70TTI0100
125 1300 1.3 11 38 A130URD70LI0125 A130URD70TTI0125
70 160 1300 2.5 22 45 A130URD70LI0160 A130URD70TTI0160
200 1300 4.7 40 54/56 A130URD70LI0200 A130URD70TTI0200
250 1300 9.6 82 58/61 A130URD70LI0250 A130URD70TTI0250
315 1300 20 172 66/72 A130URD70LI0315 A130URD70TTI0315
350 1200 28 205 68/75 A120URD70LI0350 A120URD70TTI0350
160 1300 2.6 22 46 A130URD71LLI0160 A130URD71TTI0160
200 1300 4.7 40 54 A130URD71LLI0200 A130URD71TTI0200
250 1300 8.9 76 61 A130URD71LLI0250 A130URD71TTI0250
280 1300 12 102 68/70 A130URD71LLI0250 A130URD71TTI0250
315 1300 16 138 73/76 A130URD71LLI0315 A130URD71TTI0315
350 1300 22 190 76/80 A130URD71LLI0350 A130URD71TTI0350
71 400 1300 38 330 76/80 A130URD71LLI0400 A130URD71TTI0400
450 1300 47 405 87/95 A130URD71LLI0450 A130URD71TTI0450
500 1200 68 500 90/100 A120URD71LLI0500 A120URD71TTI0500
550 1200 84 620 98/112 A120URD71LLI0550 A120URD71TTI0550
630 1100 125 930 105 A110URD71LLI0630 -
630 1200 125 930 120 - A120URD71TTI0630
280 1300 10 90 72 A130URD72LI0280 A130URD72TTI0280
315 1300 15 130 76 A130URD72LI0315 A130URD72TTI0315
350 1300 21 180 77 A130URD72LI0350 A130URD72TTI0350
400 1300 32 285 80 A130URD72LI0400 A130URD72TTI0400
450 1300 44 380 87/89 A130URD72LI0450 A130URD72TTI0450
500 1300 57 500 94/98 A130URD72LI0500 A130URD72TTI0500
550 1300 68 590 110/120 A130URD72LI0550 A130URD72TTI0550
72
630 1200 105 920 113 A120URD72LI0630 -
630 1300 105 920 125 - A130URD72TTI0630
700 1100 145 1040 122 A110URD72LI0700 -
700 1200 145 1040 140 - A120URD72TTI0700
800 1100 215 1590 125 A110URD72LI0800 -
800 1200 215 1590 146 - A120URD72TTI0800
315 1300 12 102 84 A130URD73LI0315 A130URD73TTI0315
350 1300 17 150 86 A130URD73LI0350 A130URD73TTI0350
400 1300 25 220 93 A130URD73LI0400 A130URD73TTI0400
450 1300 35 310 99/100 A130URD73LI0450 A130URD73TTI0450
500 1300 44 390 110/112 A130URD73LI0500 A130URD73TTI0500
550 1300 57 500 116/120 A130URD73LI0550 A130URD73TTI0550
630 1300 84 730 125/132 A130URD73LI0630 A130URD73TTI0630
700 1300 110 960 135/146 A130URD73LI0700 A130URD73TTI0700
800 1200 190 1630 136 A120URD73LI0800 -
73 800 1300 190 1630 148 - A130URD73TTI0800
900 1100 250 2160 150 A110URD73LI0900 -
900 1300 250 2160 170 - A100URD73TTI0900
1000 1100 370 2430 152/174 A100URD73LI1000 A100URD73TTI1000
1100 1000 445 2580 168/208 A100URD73LI1100 A100URD73TTI1100
1250 1000 585 3480 186/200 A100URD73LI1250 A100URD73TTI1250
1400 900 755 3880 210/228 A090URD73LI1400 A090URD73TTI1400
1600 700 1430 5630 203 A070URD73LI1600 A070URD73TTI1600
1800 650 2040 7600 206 A065URD73LI1800 A065URD73TTI1800
** Watts loss data is published for both blade and tapped style mounting configurations.
When two watts loss values are shown this represents tapped/blade values respectively.
D 82
PSC
1250/1300 Volt SEMICONDUCTOR PROTECTION FUSES
A130 URD 70 & 12,5 URD 70 63 to 350A
Melting Time – Current Data
Peak Let-Thru Current Data
A130 URD 71 & 12,5 URD 71 160 to 630A
Melting Time – Current Data
Peak Let-Thru Current Data
D 83
D
PSC
1250/1300 Volt SEMICONDUCTOR PROTECTION FUSES
A130 URD 72 & 12,5 URD 72 280 to 800A
Melting Time – Current Data
Peak Let-Thru Current Data
A130 URD 73 & 12,5 URD 73 315 to 1400A
Melting Time – Current Data
Peak Let-Thru Current Data
D 84
D 85
D
PSC
1250/1300VAC SEMICONDUCTOR PROTECTION FUSES
Correction factor to determine clearing
I2t value for a fuse operating below its rated voltage
Example:
Fuse 350 A in size 30
Ip= 10,000A U = 500V
At 660 V
I2t t=80,000 A2sTt= 6 ms
At 500 V
I2t t = 80,000 x 0.72 = 57,600 A2s
Tt = 6 x 0.72 = 4.3 ms
*curve for fuses page 278 with P2t published at 850VAC
Above: Correction factor to determine watts loss value of a fuse
operating below its rated current.
Above: Determines the peak ars voltage across the fuse terminals
as a function of applied voltage.
Clearing I2t vs. Operating Voltage
Watts Loss vs. Rated Current Maximum Arc Voltage vs. System Voltage
D 86
Top:Provides the DC voltage capability of a fuse as a function
of circuit time constant.
Remark:
When the fault current di/dt is very large, this condition can be
exceeded. It is the case for faults occurring in voltage
commutated inverters.
Below: Curves indicating peak arc voltage Um which may
appear across fuse terminals as a function of the DC working
voltage U, for various time constant L/R of fault path.
PSC
1250-1300Volt SEMICONDUCTOR PROTECTION FUSES
DC Voltage Capability vs. Time Constant
RATED
CURRENT
IN(A)
63
80
100
125
160
200
250
280
315
350
400
450
500
550
630
700
800
900
1000
1100
1250
1400
1600
1800
2000
2200
2500
2800
a 270
a 400
a 520
a 700
a 950
a 1300
a 1800
b 2200
b 2600
b 3000
a 950
a 1300
a 1800
a 2000
a 2300
a 2700
b 3500
b 4000
c 4800
c 5200
c 6400
a 1800
a 2200
a 2600
a 3400
b 3800
b 4600
b 5000
b 6200
c 6800
c 8000
a 2000
a 2400
a 3000
a 3500
a 3900
a 4400
a 5300
a 6000
b 8000
b 9000
c 11000
c 12000
c 13500
c 16000
a 4400
a 5200
a 6400
a 7600
a 9200
b 10000
b 12400
c 13600
c 16000
a 6000
a 7000
a 7800
a 8800
a 10600
a 12000
b 16000
b 18000
c 22000
c 24000
d 27000
d 30000
CURVES (*) AND IPM (1) CORRESPONDING TO THE RATING
70
*Ipm
(A)
71
*Ipm
(A)
72
*Ipm
(A)
73
*Ipm
(A)
2x72
*Ipm
(A)
2x73
*Ipm
(A)
Above: Ipm (1) values indicate the minimum breaking
current in amperes (A).
D 87
D
SIZE CATALOG NO. REF #
12,5 URD 73 PPAF 0315
12,5 URD 73 PPAF 0350
12,5 URD 73 PPAF 0400
12,5 URD 73 PPAF 0450
12,5 URD 73 PPAF 0500
12,5 URD 73 PPAF 0550
12,5 URD 73 PPAF 0630
12,5 URD 73 PPAF 0700
12,5 URD 73 PPAF 0800
12 URD 73 PPAF 0900
10 URD 73 PPAF 1000
9,5 URD 73 PPAF 1100
9URD 73 PPAF 1250
8,5 URD 73 PPAF 1400
12,5 URD 272 TTF 0630
12,5 URD 272 TTF 0700
12,5 URD 272 TTF 0800
12,5 URD 272 TTF 0900
12,5 URD 272 TTF 1000
12,5 URD 272 TTF 1100
11 URD 272 TTF 1250
11 URD 272 TTF 1400
10 URD 272 TTF 1600
9 URD 272 TTF 1800
7,5 URD 272 TTF 2000
6,5 URD 272 TTF 2200
6,5 URD 272 TTF 2500
12,5 URD 273 TTF 0700
12,5 URD 273 TTF 0630
12,5 URD 273 TTF 0700
12,5 URD 273 TTF 0630
12,5 URD 273 TTF 0700
11 URD 273 TTF 0630
11 URD 273 TTF 0700
11 URD 273 TTF 0630
10 URD 273 TTF 0700
9,5 URD 273 TTF 0630
9,5 URD 273 PLAF 0700
9URD 273 PLAF 0630
8,5 URD 273 PLAF 0700
6URD 273 PLAF 0630
6URD 273 PLAF 0700
5,5 URD 273 PLAF 0630
H300640
J3002641
K300642
L300643
M300644
N300645
P300646
Q300674
R300648
S300649
T300650
V300651
T300719
V300720
W300721
X300722
Y300723
Z300724
A300725
B300726
-
D300728
-
E301994
F301975
G301996
H301997
F301730
G301731
H301732
J300733
K300734
-
-
-
P300738
Q300739
M301909
R300740
S300741
K301999
M302001
N302002
WEIGHT
(g)
1
1-3
PACK.
1250
1750
1900
2600
2800
2700
73
2 X 72
PSC
1250-1300Volt SEMICONDUCTOR PROTECTION FUSES
1
2 X 73
SIZE A B C D E F G H J K d e L M N
2X72 TTF 60 138,5 172 11 91 65,5 100 35 66 39 M 10 4 131 48 72
2X73 TTF 74,5 167 200 13 91 79,6 114 50 80 39 M 12 4 131 54 86
Dimensions in mm
Microswitches and threaded studs supplied
separately (see pages 420 and 422
PSC
1250/1300 (2X72) SEMICONDUCTOR PROTECTION FUSES
D 88
Time-current characteristics
Above, left: Curves idicating pre-arcing time for each rated
current as a function of RMS value of pre-arcing current I.
- Tolerances on this current 8%.
- Beyond 30 sec or 10 sec, small overloads must be eliminated
by another device
- Curve CC’ represents the maximum times taken by the
associated device to clear small overloads; only its horizontal line
is represented. Its oblique line must be plotted according to
sketch, top right corner.
- The intersection of the fuse and CC’ curves indicates the
minimum breaking current Ipm of the fuse.
-
+
Maximum values of total operating I2t
and total operating times
Left: Horizontal curves indicating the maximum values of total
operating I2t (I2tt) as function of the prospective current Ip at 660
V, cos w = 0.15.
The oblique lines indicate the corresponding total operating time
Tt, with pre-arching time in brackets.
Melting Time Current Data Peak let thru Current Data
Clearing I2t Data
PCS
1250/1300 (2x73) SEMICONDUCTOR PROTECTION FUSES
D 89
D
Time-current characteristics
Above, left: Curves idicating pre-arcing time for each rated
current as a function of RMS value of pre-arcing current I.
- Tolerances on this current 8%.
- Beyond 30 sec small overloads must be eliminated
by another device
- The intersection of the fuse and CC’ curves indicates the
minimum breaking current of the fuse.
-
+
Maximum values of total operating I2t
and total operating times
Left: Horizontal curves indicating the maximum values of total
operating I2t (I2tt) as function of the prospective current Ip at 660
V, cos w = 0.15.
The vertical lines indicate the corresponding total operating time
Tt, with pre-arcing time in brackets.
Melting Time Current Data Peak let thru Current Data
Clearing I2t Data
