Four Clamps

Can a surge in a telephone line reach 400V?
Our country uses RJ-11 telephone plugs so I have a few RJ-11 surge protectors but all of them have the MOV 14D241K which clamps at 395V.
I have around five RJ-11 protectors in series (protector 1 -> protector 2) but once there was a lightning storm and when the surge came through the telephone line only the last protector reacted with blowing its fuses, all the other four surge protectors before it didn't react. Why didn't the other protectors react? why didn't the other fuses on the protectors before the last protector didn't blow?
I know they are all grounding well (I checked).
Connecting a surge protector to another surge protector can actually give you less protection than one. As you found out. Lighting can be hundreds of thousands of volts. But the MOV will usually open before your equipment is fried.
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