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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 RGE 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 25°C for each
PolySwitch RGE device. For example, the chart indicates that the typi-
cal time-to-trip for RGE500 at 10 A is 10 seconds.
On the chart below, find the typical time-to-trip for the RGE device you
selected. If the RGE 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 25°C
A = RGE300
B = RGE400
C = RGE500
D = RGE600
E = RGE700
F = RGE800
G = RGE900
H = RGE1000
I = RGE1100
J = RGE1200
K = RGE1400
132 RGE Devices
Raychem Circuit Protection Devices
RGE
Radial Leaded
1
1000
100
10
1
0
.01
.001
10
Fault current (A)
100
AB C D E F H
GJ K
I
4
RGE(7)
1/15/99 11:16 AM
Page 132
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