TWO-STAGE SUPER-CONDUCTING CURRENT LIMITER-CIRCUIT BREAKER AND METHOD OF ITS PRODUCTION Russian patent published in 2009 - IPC H01H81/02 

FIELD: electrical engineering .

SUBSTANCE: invention relates to two-stage superconducting (SC) current-limiter circuit breaker and method of its production, and can be used in cryoelectronics for automatic overcurrent protection. Current limiter represents parallel CS thick films separated by insulating film. Structure parameters are defined by relationship

where h_C1, b₁, (h_C2, b₂) are thickness and width of additional (primary) SC current limiter, h_d is the thickness of insulating film, j_kp1(j_kp2) is critical current density of additional (primary) current limiter, B_kp2 is induction of the main current limiter critical field, k is the factor of first operation (k=0.6-0.9). Positive effect of proposed invention is ensured by applying current limiter thick film on substrate, the current limiter featuring higher firing temperature, firing aforesaid thick film in and, then insulating layer is applied. Now the film of second current limiter is applied to be fired in.

EFFECT: higher speed and reliability of breaking operating circuit, cutting in warning signal via connection of additional relay and current limier.

3 cl, 3 dwg