RXE
4.
Determine time-to-trip.
Radial Leaded
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 RXE 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 RXE device. For example, the chart indicates that the
typical time-to-trip for RXE050 at 5 A is 0.3 second.
On the chart below, find the typical time-to-trip for the RXE device you
selected. If the RXE 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
A
=
B
=
C
=
D
=
E
=
F
=
G
=
H
=
I
=
J
=
K
=
L
=
M
=
N
=
O
=
P
=
Q
=
RXE010
RXE017
RXE020
RXE025
RXE030
RXE040
RXE050
RXE065
RXE075
RXE090
RXE110
RXE135
RXE160
RXE185
RXE250
RXE300
RXE375
1000
A
B CDE F G H I J K L M N OPQ
100
10
Time-to-trip (s)
1
0.1
0.01
0.001
0.1
1
Fault current (A)
10
100
Raychem Circuit Protection Devices
RXE Devices
169
ETC [ ETC ]
