PROTECTORS


 

Protector, Electrode, No. 1B

DC striking Voltage - 600-900V

 

 
Protector, Electrode,  No. 1C

DC striking Voltage - 1100-1700V

 

 
Protector, Electrode, No. 5A

DC striking Voltage - 210-310V
Pulse current rating - 1000A
Capacitance - 5pF
Mains Failsafe feature - No

 

 
Protector No. 11A

DC striking Voltage - 195-265V
Pulse current rating - 5000A
Capacitance - 5pF
Mains Failsafe feature - No

Two lead Gas Discharge Tube used on PCB boards.  Two fly leads.

 

Protector No. 14A

DC striking Voltage - 210-310V
Pulse current rating - 5000A
Capacitance - 5pF
Mains Failsafe feature - No

Used in Mounting Protector No. 4A or 5B

 

Protector No. 14A/1

DC striking Voltage - 210-310V
Pulse current rating - 5000A
Capacitance - 5pF
Mains Failsafe feature - Yes

Used in Mounting Protector No. 5B

 

Protector No. 18B

DC striking Voltage - 210-310V
Pulse current rating - 5000A
Capacitance - 5pF
Mains Failsafe feature - No

Encapsulated with fly leads.

 

Protector No. 18C

DC striking Voltage - 210-310V
Pulse current rating - 5000A
Capacitance - 5pF
Mains Failsafe feature - Yes

Encapsulated with fly leads.

 

 
Protector No. 19A

DC striking Voltage - 270V
Pulse current rating - 1000A
Capacitance - 500-1000pF
Mains Failsafe feature - No

Similar to No. 14A/1 but very fast semiconductor construction (Thyristor based device with 3 poles).

Used in Mounting Protector No. 5B

 

Protector No. 20A

DC striking Voltage - 150-250V
Pulse current rating - 5000A
Capacitance - 5pF
Mains Failsafe feature - Yes

Used in Mounting Protector No. 5B

 

 
Protector No. 21A

DC striking Voltage - 150-250V
Pulse current rating - 5000A
Capacitance - 5pF
Mains Failsafe feature - Yes

Used in Mounting Protector No. 5B

 

Protector No. 22A

DC striking Voltage - 250V
Pulse current rating - 5000A
Capacitance - 35pF
Mains Failsafe feature - Yes

High speed over current device using semiconductors.

Used in Mounting Protector No. 5B

 

Protector No. 22C

DC striking Voltage - 145-250V
Pulse current rating - 5000A
Capacitance - 200pF
Mains Failsafe feature - No

High speed over current device using semiconductors.

Used in Mounting Protector No. 5B

 

   

 

 
BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: September 02, 2020

FM