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SPDs for Field Devices

FDB2-24

Surge arrester with a low-capacitance protective circuit for protecting intrinsically safe measuring circuits and bus systems. Application: Flow sensors, temperature sensors.

  • Easy to mount on the spare cable gland of field devices
  • Self-capacitance and self-inductance negligibly small
  • Stainless steel housing with pressure-resistant encapsulation
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dimensions-fdb2-24
Dimensions
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Basic circuit diagram

Technical data

TypeFDB2-24
SPD according to EN 61643-21 / IEC 61643-21type 2 / class II
Nonimal voltage Un24 V
Max. continuous operating a.c. voltage Uc22.6 V
Max. continuous operating d.c. voltage Uc32 V
Max. input voltage acc. to EN 60079-11 Ui30 V
Max. input current acc. to EN 60079-11 Ii0.55 A
Nominal current IL0.55 A
D1 Lightning impulse current (10/350 μs) line-PG (Iimp)1 kA
C2 Total nominal discharge current (8/20 μs) (In)10 kA
C2 Nominal discharge current (8/20 μs) line-line (In)150 A
C2 Nominal discharge current (8/20 μs) line-PG (In)10 kA
Voltage protection level line-line for In C2 (Up)≤ 58 V
Voltage protection level line-PG for In C2 (Up)≤ 1700 V
Voltage protection level line-line at 1 kV/μs C3 (Up)≤ 50 V
Voltage protection level line-PG at 1 kV/μs C3 (Up)≤ 1200 V
Cut-off frequency line-line (fG)67 MHz
Capacitance line-line (C)≤ 25 pF
Capacitance line-PG (C)≤ 15 pF
Range of operating temperatures (TU)-40/+80°C
Degree of protectionIP67
For mounting on (field / device side)M20 x 1.5 male thread
Connectionconnecting lines (1.3 mm2)
Length of the connecting lineApprox. 150 mm
Earthing viaconnecting line
Enclosure materialstainless steel

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