U.L. Approved Dual Function
Fuse Resistors
F500 Series
• Affords protection for semiconductor devices
• Acts as a precision wirewound resistor and a fuse
• Allows precise control of fusing point and time lag
• Reduces the number of discrete components required
• Eliminates unnecessary blowing due to transient conditions
• Eliminates fire hazard and circuit board damage due to overheated components
Electrical Data
Steady State
Blow Condition I
Blow Condition II
IRC
Style
Resistance
(ohms)
Dissipation
(watts)
Dissipation BlowTime
Dissipation Blow Time
Current
Current
(watts)
(T max)
500ms
300ms
10sec
500ms
50ms
Current
25A
(watts)
125
125
112
112
112
100
100
100
98
(T max)
50ms
30ms
100ms
50ms
10ms
100ms
50ms
10ms
50ms
50ms
10ms
50ms
10ms
20ms
10ms
50ms
50ms
100ms
50ms
50ms
50ms
50ms
50ms
100ms
50ms
200ms
100ms
10ms
F501
0.2
0.2
0.5
0.5
0.5
1
2.2A
2.2A
1
10A
10A
20
F502
1
20
25A
F503
1.4A
1
6A
18
15A
F504
1.4A
1
6A
18
15A
F505
1.4A
1
6A
18
15A
F506
1.0A
1
4A
16
10sec
500ms
50ms
10A
F507
1
1.0A
1
4A
16
10A
F508
1
1.0A
1
4A
16
10A
F509
2
700ma
700ma
700ma
450ma
400ma
350ma
300ma
300ma
200ma
220ma
220ma
150ma
140ma
130ma
80ma
100ma
80ma
60ma
70ma
60ma
1
3A
18
10sec
200ms
50ms
7A
F510*
F511*
F512*
F513*
F514*
F515*
F516*
F517*
F518*
F519*
F520*
F521*
F522*
F523*
F524*
F525*
F526*
F527*
F528*
2
1
3A
18
7A
98
2
1
3A
18
7A
98
5
1
2A
20
200ms
50ms
4.5A
101
80
5
0.8
0.6
0.9
0.9
0.4
1
1.5A
1.0A
1.2A
1.0A
600ma
600ma
600ma
350ma
400ma
350ma
200ma
250ma
200ma
140ma
200ma
150ma
10
4.0A
5
5
100ms
200ms
100ms
100ms
10sec
100ms
500ms
500ms
100ms
200ms
10sec
200ms
10sec
10sec
100ms
1.4A
10
10
10
10
20
20
20
50
50
50
100
100
100
200
200
14
3.0A
90
10
1.3A
17
3.6
7.2
7.2
2.4
8.0
6.1
2.0
6.2
4.0
2.6
8.0
4.0
900ma
900ma
900ma
450ma
600ma
450ma
240ma
300ma
250ma
180ma
250ma
250ma
8
16
1
16
0.4
1
4
18
0.8
0.3
1
10
2.9
9.0
6.2
3.2
12.5
12.5
0.6
0.4
1
0.8
*UL LISTED - Add "S" To Style Description
Contact factory for specification limits beyond these listed.
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
A subsidiary of
TT electronics plc
Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
F500 Series Issue October 2008 Sheet 1 of 2