RUE(7) 1/15/99 11:28 AM Page 141
RUE
Selection Guide
and Product Data
This section has two parts:
• A Selection Guide that walks you through the process of
selecting the correct RUE device for a circuit.
• Product Data that outlines electrical characteristics,
physical characteristics, agency recognitions, environmental
specifications, component layouts, tape and reel specifications,
and ordering information for RUE devices.
RUE Selection Guide
Follow these seven steps to select a PolySwitch RUE device for
a circuit:
1. Define the operating parameters for the circuit.
These include:
• Maximum ambient operating temperature
• Normal operating current
• Maximum operating voltage (RUE is 30 V maximum)
• Maximum interrupt current
2. Select the RUE device that accommodates the circuit’s maximum
ambient operating temperature and normal operating current.
3. Compare the RUE device’s maximum operating voltage and maxi-
mum interrupt current with the circuit’s to be sure the circuit does not
exceed the device ratings.
4. Check the RUE device’s time-to-trip to be sure it will protect the
circuit.
5. Verify that the circuit’s ambient operating temperatures are within the
RUE device’s operating temperature range.
6. Verify that the RUE device’s dimensions fit the application’s space
considerations.
7. Independently evaluate and test the suitability and performance
of the RUE device in the application.
4
®
®
TUV Rheinland
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RUE Devices
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RUE
Radial Leaded
1.
Define the circuit’s operating parameters.
Fill in the following information about the circuit:
Maximum ambient operating temperature
Normal operating current
Maximum operating voltage (RUE is 30 V max.)
Maximum interrupt current
_______________
_______________
_______________
_______________
2.
Select the PolySwitch RUE device that will accommodate the
circuit’s maximum ambient operating temperature and
normal operating current.
Look across the top of the table below to find the temperature that
most closely matches the circuit’s maximum ambient operating temper-
ature. Look down that column to find the value equal to or greater than
the circuit’s normal operating current. Now look to the far left of that
row to find the part number for the RUE device that will best accommo-
date the circuit.
The thermal derating curve located on the next page is a normalized
representation of the data in the table below.
4
I
Hold
vs. temperature
Part
number
RUE090
RUE110
RUE135
RUE160
RUE185
RUE250
RUE300
RUE400
RUE500
RUE600
RUE700
RUE800
RUE900
Maximum
–40°
1.31
1.60
1.96
2.32
2.68
3.63
4.35
5.80
7.25
8.70
10.15
11.60
13.05
ambient operating temperatures (°C)
–20°
0°
20°
40°
1.17
1.04
0.90
0.75
1.43
1.27
1.10
0.91
1.76
1.55
1.35
1.12
2.08
1.84
1.60
1.33
2.41
2.13
1.85
1.54
3.25
2.88
2.50
2.08
3.90
3.45
3.00
2.49
5.20
4.60
4.00
3.32
6.50
5.75
5.00
4.15
7.80
6.90
6.00
4.98
9.10
8.05
7.00
5.81
10.40
9.20
8.00
6.64
11.70
10.35
9.00
7.47
50°
0.69
0.85
1.04
1.23
1.42
1.93
2.31
3.08
3.85
4.62
5.39
6.16
6.93
60°
0.61
0.75
0.92
1.09
1.26
1.70
2.04
2.72
3.40
4.08
4.76
5.44
6.12
70°
0.55
0.67
0.82
0.98
1.13
1.53
1.83
2.44
3.05
3.66
4.27
4.88
5.49
85°
0.47
0.57
0.70
0.83
0.96
1.30
1.56
2.08
2.60
3.12
3.64
4.16
4.68
142
RUE Devices
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RUE
Thermal derating curve
200
Radial Leaded
Percent of rated hold
and trip current
150
100
50
0
–40
–20
0
20
40
60
80
Device’s ambient temperature (°C)
3.
Compare maximum operating voltages and maximum
interrupt currents.
Look down the first column of the table below to find the part number
you selected in Step 1. Look to the right in that row to find the device’s
maximum operating voltage (V max.) and maximum interrupt
current (I max.).
Compare both ratings with the circuit’s to be sure the circuit’s ratings
do not exceed those of the RUE device.
4
Maximum device voltages and currents
Part
number
RUE090
RUE110
RUE135
RUE160
RUE185
RUE250
RUE300
RUE400
RUE500
RUE600
RUE700
RUE800
RUE900
V max.
(volts)
30
30
30
30
30
30
30
30
30
30
30
30
30
I max.
(amps)*
40
40
40
40
40
40
40
40
40
40
40
40
40
*Device may withstand higher interrupt current at lower voltages.
Each application will need to be individually qualified.
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RUE Devices
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RUE
Radial Leaded
4.
Determine time-to-trip.
Time-to-trip is the amount of time it takes for a device to switch to a
high-resistance state once a fault current has been applied across the
device.
Identifying the RUE device’s time-to-trip is important in order to provide
the desired protection capabilities. If the device you choose trips
too fast, undesired or nuisance tripping will occur. If the device trips
too slowly, the components being protected may be damaged before
the device switches to a high-resistance state.
The chart below shows the typical time-to-trip at 20°C for each
PolySwitch RUE device. For example, the chart indicates that the typi-
cal time-to-trip for RUE110 at 8 A is 1 second.
On the chart below, find the typical time-to-trip for the RUE device you
selected. If the RUE device’s time-to-trip is too fast or too slow for the
circuit, go back to Step 2 and choose an alternate device.
Typical time-to-trip at 20°C
4
Time-to-trip (s)
A
=
B
=
C
=
D
=
E
=
F
=
G
=
H
=
I
=
J
=
K
=
L
=
M
=
RUE090
RUE110
RUE135
RUE160
RUE185
RUE250
RUE300
RUE400
RUE500
RUE600
RUE700
RUE800
RUE900
1000
AB C D E FG H I J K LM
100
10
1
0.1
0.01
0.001
1
10
Fault current (A)
100
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RUE
5.
Verify ambient operating conditions.
Ensure that your application’s minimum and maximum ambient
temperatures are within the operating temperature range of –40°C
and 85°C.
Maximum device surface temperature in the tripped state is 125°C.
Radial Leaded
6.
Verify the RUE device’s dimensions.
Using dimensions from the table below, compare the dimensions of the
RUE device you selected with the application’s space considerations.
Product dimensions
(millimeters/inches)
Part
number
RUE090
RUE110
RUE135
RUE160
RUE185
RUE250
RUE300
RUE400
RUE500
RUE600
RUE700
RUE800
RUE900
A
max.
7.4
(0.29)
7.4
(0.29)
8.9
(0.35)
8.9
(0.35)
10.2
(0.40)
11.4
(0.45)
11.4
(0.45)
14.0
(0.55)
14.0
(0.55)
16.5
(0.65)
19.1
(0.75)
21.6
(0.85)
24.1
(0.95)
B
max.
12.2
(0.48)
14.2
(0.56)
13.5
(0.53)
15.2
(0.60)
15.7
(0.62)
18.3
(0.72)
17.3
(0.68)
20.1
(0.79)
24.9
(0.98)
24.9
(0.98)
26.7
(1.05)
29.2
(1.15)
29.7
(1.17)
C
typ.
5.1
(0.20)
5.1
(0.20)
5.1
(0.20)
5.1
(0.20)
5.1
(0.20)
5.1
(0.20)
5.1
(0.20)
5.1
(0.20)
10.2
(0.40)
10.2
(0.40)
10.2
(0.40)
10.2
(0.40)
10.2
(0.40)
D
min.
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
7.6
(0.30)
E
max.
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
3.0
(0.12)
F
typ.
(0.03)
(0.03)
(0.03)
(0.03)
(0.03)
(0.03)
(0.05)
(0.05)
(0.05)
(0.05)
(0.05)
(0.05)
(0.05)
0.8
0.8
0.8
0.8
0.8
0.8
1.2
1.2
1.2
1.2
1.2
1.2
1.2
4
Lead size
RUE090–RUE250
RUE090–RUE250*
Ø 0.51
(0.020)
24 AWG
Ø 0.81
(0.032)
20 AWG
A
E
RUE300–RUE900**
A
E
RUE300–RUE900
Marking
B
Marking
B
D
* Straight leads are available
** Kinked leads are available
C
L
D
C
C
L
CC
L L
F
C
C
L
C
L
CC
L L
F
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RUE Devices
145
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