Brochure/Catalogue

Installation advice for instrumentation and control engineering
Surge protection for sensors with current loop output
0 (4)...20 mA
VSPC 2CL plug-in surge protector for protecting two current
loops with 0 (4)...20 mA.
The unprotected side points in the direction where the pulse
or interference is expected. The connecting cable’s shield
is connected to terminal 3 e. g. the Weidmüller clamping
bracket (KLBÜ) can be used.
PE
PROTECTED
UNPROTECTED
8
10
12
2 4
6
1
3
5
7
9
11
VSPC 2CL
24 V DC
8924470000
U:28 V DC
C
I:0,45 A
N
C1 <1 kA 8/20
IP 20
U 650 V
P
≤
PE
PROTECTED
UNPROTECTED
8
10
12
2 4
6
1
3
5
7
9
11
VSPC 2CL
24 V DC
8924470000
U:28 V DC
C
I:0,45 A
N
C1 <1 kA 8/20
IP 20
U 650 V
P
≤
4...20 mA
4...20mA4...20mA
PLC
4...20 mA4...20 mA
4...20 mA
The earthed DIN rail can then pick up the pulse and
discharge it to the earth.
For long cables, and especially for current loops, additional
protection is set-up at the sensors. The VSPC BASE FG
oating-earth base can be used there. A built-in gas
discharge tube makes this a “high impedance” earth, which
prevents an interference current on the shield.
B
B.126 2028840000
Lightning and surge protection for control and instrumentation signals