Brief introduction:
FA906/FA9-68Protectors are inserted into the FT203/FA8-68 Protection Terminal Blockrespectively, forming the protection circuits, which can provide the followingprotection against over-voltage and over-current:
1.The surge voltage caused by lightning on or around the external line.
2.The short-time AC voltage inducted on external lines, when the power line, thepower system or the electric railway system is broken down in the neighborhoodof the external line.
3.The external line directly collides against a 220 V power line.
Eachprotector has test eyelet, which can coordinate with the special test plug totest the external line as well as the components inside the protector.
 
Structure:
PTC+GDT+LED
PTC+SA+LED
IC+LED
Note:GDT – Gas Discharge Tube; SA – Semiconductor Arrester;
   IC – Integrated Circuit
                                                                                                 
TechnicalSpecification:
Insulationresistance ≥1000MΩ
Contactresistance difference between a line and b line: ≤1Ω
LowerVoltage Limit:  GDT protector (100V/s escalating  rate) ≥190V
SAprotector  (100KV/s escalating rate)≥190V
UpperVoltage Limit:  GDT protector (100V/s escalating rate) ≤260V
(1KV/usescalating rate) ≤800V
SAprotectors  (100KV/s escalating rate) ≤260V
(1KV/usescalating rate) ≤400V
Alarmingcurrent ≥2.5 A (virtual value), with responding time ﹤15 second