3-electrode GDT

BM 420/20
Part Number: 9297018
BM 420/20
  • The smallest 3-electrode GDT
  • No radioactive
  • Used in connector blocks and adapted holders
  • SMD compatible
  • Available in version "Square SMD anti-rolling" (BMSQ)
  • Available in version for surface mounting device (BM CMS)
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CITEL BM surge arresters are 3-electrode gas discharge tubes designed in ceramic technology and created to protect telecommunication or computer equipment, The reduced size of the BM series enables the implementation in limited space applications (small connector blocks...), SMD mounting (BM CMS type) or PCB mounting (with lead termination : BMS). BM could be provide with external fail-safe mechanism (BMC type) and is available in several DC sparkover voltages.
DC sparkover voltage (100V/s)
336-504 V
DC spark voltage tolerance
 +/- 20%
Maximum impulse sparkover voltage (1kV/µs)
 <1000 V
Nominal discharge current
10 x 8/20µs impulses
 In 10 kA
Total Maximum discharge current
max. total withstand @ 8/20 µs
Imax Total 25 kA
Impulse discharge current
10/350µs - 1 time
 2 kA
Max. capacitance
 C <0.5 pF
Insulation resistance
 IR ≥10 GOhms
Glow-to-arc transition current
 0.5 A
AC discharge current (50Hz)
 10 A
DC Holdover voltage
R = 300 ohms in serie R = 150 ohms; 100nF en parrallel
 >80 V
Impulse life
300 times, interval 2 min
50 A
Technology
 Gas discharge tube
Operating and storage temperature
 -40°C / +90°C
Dimensions
 See diagram
Weight
 0.67 g
Standards compliance
 ITU-T K12 rec.
Certification
 UL Recognized / ROHS
RohS compliance
 Yes