TII Gas Tubes
73 & 74 SERIES 3-ELECTRODE HEAVY DUTY
73 Model 
 74 Model
MODEL NUMBER MATRIX
| 1 |
2 |
3 |
4, 5, 6, 7 |
| 7X |
XXX |
XX |
XXXX |
1. Leads
3 = With Leads
4 = No Leads
|
2. Voltage Breakdown
400 (300-500 volts)
300(240-360 volts)
200 (160-240 volts)
|
3. Failsafe
NF = No Failsafe
FS = Failsafe Only
FV = Failsafe and Ventsafe
|
4. Number of Leads
0 = No Leads
1 = Ground Lead Only
2 = Three Leads
|
5. Lead Diameter
0 = No Leads
1 = .039"
2 = .050"
3 = .062"
|
6. Lead Length
0 = No Leads
1 = .250"
2 = .500"
|
7. Service Life
A = CCITT (8/20 10 Ka Rating)
|
SPECIFICATIONS
| Model Number |
73-090 |
73-400
74-400 |
73-300
74-300 |
73-200
73-200 |
| DC Breakdown Voltage |
75-120 |
300-500 |
240-360 |
180-240 |
| Single Impulse Discharge Current |
20 kA, 10 kA/Side |
20 kA, 10 kA/Side |
20 kA, 10 kA/Side |
20 kA, 10 kA/Side |
| AC Discharge Current 11 Cycles |
N/A |
N/A |
N/A |
N/A |
| Impulse Breakdown Voltage |
0.35 kV |
0.65kV, 0.7kV |
0.65kV, 0.7kV |
0.65kV, 0.7kV |
| Impulse Breakdown Waveform v/µsec |
100 V |
100V, 1 kV |
100V, 1 kV |
100V, 1 kV |
| Holdover Voltage @200mA |
150 V |
150 V |
150 V |
150 V |
| Impulse Life 500A @10/1000 |
400 times |
400 times, 500A/Side |
400 times, 500A/Side |
400 times, 500A/Side |
| Capacitance |
2 pF |
2 pF (10pF with F/S) |
2 pF (10pF with F/S) |
2 pF (10pF with F/S) |
| DC Arc Voltage |
30 V |
30 V |
30 V |
30 V |
| Glow to Arc Transition Current |
1 A |
1 A |
1 A |
1 A |
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