Flame-Proof Fusible Resistors
Type FRN Series
Type FRN Series
Characteristics -
Electrical
Rated Power @ 70°C (W)
Resistance Range (Ohms) Min
Max
Tolerance (%)
Code letter
Temperature Coefficient (ppm/°C)
Selection Series
Limiting Element Voltage
Max Permitted Element Voltage
Max Overload Voltage
Max Intermittent Overload Voltage
Max Withstand Voltage After Fusing
Operating Temp. Range (°C)
Climatic Category
Insulation Resistance
Min Dry (ohms)
FRN25
0.25
R12
12K
FRN50S
0.5
R12
12K
FRN100S
1
R33
10K
5
J
E12
300
300
600
600
450
-55 to +155
55/155/56
1000M
FRN200S
2
R30
1K0
FRN300S
3
R30
1K0
±350
250
250
500
500
300
250
250
500
500
350
±200 (-30°C to +150°C)
300
350
600
600
450
300
350
600
600
450
The resistive element comprises a
resistive film sputtered onto a ceramic
element. Metal end caps are force
fitted to the element prior to spiralling.
Tinned copper lead wires are welded to
the end caps and the components are
then coated with four layers of a flame-
proof cement. All resistors are tested
for value and tolerance. The technology
allows the manufacture of custom
fusible characteristics.
Dimensions
Key Features
■
Superior quality
resistors with fusing
characteristics for
overload conditions.
Flame-proof during
fusing.
Ideal for use in safety-
critical and circuit
protection applications.
These resistors fuse in
less than 60 seconds at
16 times rated power.
(See table)
Style
FRN25
FRN50S
FRN100S
FRN200S
FRN300S
L
6.3 ±0.5
6.3 ±0.5
9.0 ±0.5
11.0 ±1.0
15.0 ±1.0
D
2.3 ±0.3
2.3 ±0.3
3.2 ±0.5
4.5 ±1.0
5.5 ±1.0
d Nom
0.54
0.54
0.54
0.70
0.80
l
25.0
25.0
25.0
25.0
25.0
■
■
■
Derating Curve -
FRN25, FRN50S, FRN100S
100
Percent Rated Power
Percent Rated Power
80
60
40
20
0
40
60 70 80
100
120
140
160
Ambient Temperature (°C)
100
80
60
40
20
0
FRN200S, FRN300S
20
60 70 100
140
180
220
260
Ambient Temperature (°C)
Literature No. 1773218
Issued: 10-08
Dimensions are shown for
reference purposes only.
Dimensions are in
millimetres unless
otherwise specified.
Specifications subject to
change.
tycoelectronics.com
passives.tycoelectronics.com
Flame-Proof Fusible Resistors
Type FRN Series
Mounting
The resistors are suitable for processing on automatic insertion equipment.
Marking
The resistors are marked with a 3 colour band code indicating the value.
The fourth band indicates the multiplier.
The fifth band indicates the tolerance.
Packaging
FRN25, FRN50S and FRN100S are normally supplied taped in 'ammo' boxes of 4,000 pieces.
FRN200S and FRN300S resistors are normally supplied taped in 'ammo' boxes of 1,000 pieces.
Other package styles available on request.
All tape specifications are in accordance with IEC 286-1.
Fusing Characteristics
Overload Power
16 times rated power
20 times rated power
24 times rated power
28 times rated power
32 times rated power
Maximum Fusing Time
60 seconds
40 seconds
30 seconds
20 seconds
15 seconds
Performance Characteristics
The evaluation of the performance characteristics is carried out with reference to IECQ
specifications QC 400 000 and QC 400 100.
TEST REF
4.23
4.24
4.25.1
4.25.3
TEST REF
4.13
4.16
4.18
4.19
4.22
Long Term Tests ±(5% + 0.5 ohm)
Climatic sequence
Damp heat, steady state
Endurance at 70 °C
Endurance at 155 °C
Short Term Tests ±(1% + 0.05 ohm)
Overload
Robustness of terminations
Resistance to soldering heat
Rapid change of temperature
Vibration
How to Order
FRN
Common Part
25
Size
25 - 1/4 Watt
50S - 1/2 Watt
FRN - Fusible
Leaded Resistor
100S - 1 Watt
200S - 2 Watts
300S - 3 Watts
J - 5%
1 ohm
(1 ohm) 1R0
1K ohm
(1000 ohms) 1K0
J
Tolerance
1K0
Resistance Value
Literature No. 1773218
Issued: 10-08
Dimensions are shown for
reference purposes only.
Dimensions are in
millimetres unless
otherwise specified.
Specifications subject to
change.
tycoelectronics.com
passives.tycoelectronics.com
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