Project Description



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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Type FDB2-24
SPD according to EN 61643-21 / IEC 61643-21 type 2 / class II
Nonimal voltage Un 24 V
Max. continuous operating a.c. voltage Uc 22.6 V
Max. continuous operating d.c. voltage Uc 32 V
Max. input voltage acc. to EN 60079-11 Ui 30 V
Max. input current acc. to EN 60079-11 Ii 0.55 A
Nominal current IL 0.55 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 protection IP67
For mounting on (field / device side) M20 x 1.5 male thread
Connection connecting lines (1.3 mm2)
Length of the connecting line Approx. 150 mm
Earthing via connecting line
Enclosure material stainless steel


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