3-electrode GDT

BT 90/20
Part Number: 9290001
BT 90/20
  • 3-electrode GDT
  • No radiactive
  • Use in connection blocks and holders
  • ITU-K12 compliant
  • Available in version for PCB mounting (BT S and BT R series)
  • Available version with fail-safe (BT C series)

The BT serie is a range of 3-electrode Gas Discharge Tubes designed by CITEL with ceramic and non-radioactive technology. This range is available without leads (contact on side electrodes: BT type) to fit in standard connectors blocks or holders. Versions with leads, radial leads (BTR version) or axial leads (BTS version) for PCB mounting. BT gas tubes can be supply with a fail-safe mechanism (BTC version). BT are available in a large range of DC sparkover voltages and are in compliance with international standards (ITU-T rec. K12).

DC sparkover voltage (100V/s)
72-108 V
DC spark voltage tolerance
+/- 20%
Maximum impulse sparkover voltage (1kV/µs)
<620 V
Nominal discharge current
10 x 8/20µs impulses
In 20 kA
Total Maximum discharge current
max. total withstand @ 8/20 µs
Imax Total 25 kA
Impulse discharge current
10/350µs - 1 time
4 kA
Max. capacitance
C <0.9 pF
Insulation resistance
IR ≥10 GOhms
Arc Voltage
≤ 25 V
Glow-to-arc transition current
0.5 A
Glow voltage
≤ 100 V
AC discharge current (50Hz)
20 A
DC Holdover voltage
R = 300 ohms in serie R = 150 ohms; 100nF en parrallel
>70 V
Gas discharge tube
Operating and storage temperature
-40°C / +90°C
Failsafe mode
With fail-safe: BT C 90/20 (9291001)
See diagram
2.31 g
Standards compliance
ITU-T K12 rec.
RohS compliance