Safety device for communication equipment

Abstract From the Canadian patent

A safety device for telecommunication equipment wherein a telecommunication circuit is promptly grounded when overvoltage is applied to the circuit or overcurrent is led to it and in which the production of excessive head and of damage to the communication equipment is prevented. The safety device includes an overvoltage protective circuit which comprises a ceramic discharge tube having a ground electrode on the middle part of the discharge tube and end electrodes on opposite sides of the discharge tube; a shorting member positioned between the ground electrode and the end electrodes; and insulating means for preventing the shorting member from electrically coupling the ground electrode and …