The Dossert limiter is designed with a fusible element which is held to close tolerances to insure a close consistency of operation on all production made elements of any given size. The fusible section provides a time lag on intermittent overloads and does not open the circuit as does a common fuse. The fusible. section is designed to sustain moderate overloads but to burn clear and open the circuit under such heavy overloads or faults which would be of a magnitude sufficient to cause damage to the cable insulation.

    The time-current characteristics are in consequence derived from the insulation damage characteristics of the cable. Since the insulation damage characteristics of rubber covered and oil-impregnated, paper cable are practically identical, the curves on the chart Constitute the damage characteristics for both types of cable. The curves resolving the time-current characteristics of Limiters and the insulation damage characteristics of cables found on the chart represent those sizes commonly used in underground network systems.

    The limiter fusing characterteristics shown on the chart apply to all types of limiter designs-whether they be straight Limiters, Limiter lugs or any Limiter modification designed for the particular conductor size shown.