Pulse Withstanding Fusible
Flameproof Metal Film Resistors
EMC Series
Flammability
The resistor coating is UL94-V0 rated and will not burn or emit incandescent particles under any condition of applied
temperature or power overload.
Marking
EMC resistors are colour coded with five bands. Four of the bands indicate value and tolerance in accordance with
IEC62. Parts with 20% tolerance have no fourth band. A fifth yellow band denotes constant voltage fusibility.
Performance Data
Maximum
Load at Rated Power: 1000hrs @ 70°C
Shelf life: 12 months at room temperature
Derating from rated power at 70°C
Climatic
Climatic Category
Temperature rapid change
Resistance to solder heat
Pulse Performance
Δ R%
Δ R%
Δ R%
Δ R%
Δ R%
5
2
Zero at 155°C
3
50/155/56
0.5
0.5
10000
500
400
300
200
100
0 0 0 10 20 20 30 30 40 40 50 50 60 60 70 70
10
20
30
40
50
Value (Ohms)
Value (Ohms)
1000
100 100
10 10
0.01 0.01 0.1 0.1
1 1 1
10 10 10 100 100 1000 1000 10000
1000 10000
0.01
100
Pulse Duration (ms) (ms)
Pulse Duration (ms)
IEC61000-4-5 1.2/50 s Pulse
700
600
500
400
300
200
100
0 0 0
10 60 70
Value (Ohms)
Fusing Performance
EMC resistors fuse open circuit at overload powers
exceeding 60W within the time indicated on the Fusing
Characteristic. Their fusing performance at lower
overload powers is not specified.
Single Rectangular Pulse
10000
1000 1000
100
10
1 1 1
0.1 10000
Pulse Duration
Fusing Characteristic
(Constant Voltage)
EMC resistors fuse safely in the event of a 115Vrms /
240Vrms overload (line / mains short circuit condition)
without burning or emitting incandescent particles.
After fusing, the resistance is at least 100 times greater
than the original nominal value.
20
15
10
5
0
40
50
60
70
80
(4R7-8R2)
(10R-68R)
90 100
Initial Power (W)
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
? TT electronics plc
07.13
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