JOSLYN, BALANCED TRIGARD®

2026-SERIES, 3-POLE GAS TUBE
UL RECOGNIZED


Description: Common chamber, three electrode gas discharge tube.
Principal Use: Protection of telephone and signalling equipment from lightning, induction or foreign
curcuit contact. Balanced construction and effective cross-ionization
provide symmetrical performance.
Characteristics: L-G, Test Methods per ITU-T (CCITT) K.12

Model Numbering
2026-09
2026-15
2026-20
2026-23
2026-25
2026-30
2026-35
2026-40
DC Sparkover, 100 V/s
90 V
150 V
200 V
230 V
250 V2
300 V
350 V
400 V
(72-108)
(120-180)
(160-240)
(184-276)
(210-300)
(250-350)
(280-420)
(300-500)
Impulse Sparkover
100 V/µs
500 V
450 V
475 V
500 V
550 V
600 V
700 V
800 V
1 kV/µs
700 V
600 V
625 V
650 V
700 V
800 V
900 V
1000 V

 

 

 

 

Impulse Transverse Delay 1 kV/µs 75 ns
Insulation Resistance 100 V (50 V for -09) >1010 ohm
Glow Voltage 10 mA 70 V
Arc Voltage   10 V
Glow-Arc Transition Current   <.5 A
Capacitance 1 MHz <2 pF
DC Holdover Voltage >135 V (52V for -09, 80V for -15) <150 ms
Impulse Discharge Current3 20 kA 8/20 µs4 40 kA total 1 Operation
  10 kA 8/20 µs5 20 kA total 10 Operations
  5 kA 8/20 µs 10 kA total 10 Operations
  100 A 10/700 µs 200 A total 500 Operations
  100 A 10/1000 µs 200 A total 300 Operations
Alternating Discharge Current3 65 Arms, 11cycles4 130 A total 1 Operation
  10 Arms, 1 s 20 A total 10 Operations
Failsafe Operating Time 1 Arms   20 s
2026-xx-C2F1 only 5 Arms   5 s
  10 Arms   3 s
Warranty     1 Year
1. Model number marking on tube: 26-xxxV
2. Meets lilimits for both BT 260V and ITU 250V ratings
2026-25-C2=BT Type 14A; 2026-25-C2F1=BT Type 14A/1
3. Discharges applied simultaneously each line to center
4. Tube will remain functional without shorting or venting
(failsafe removed)
5. DC Sparkover limits increase by 5%
6. Finish is nickel: not intended for soldering
7. Lead finish is solder
8. Finish is nickel; for solderable leads, order -C2S
9. UL File E153537