CIRCUIT BREAKER WITH ADJUSTABLE THERMAL AND ELECTROMAGNETIC CURRENT DISCONNECTORS Russian patent published in 2023 - IPC H01H73/48 

FIELD: electric power and electrical engineering.

SUBSTANCE: invention relates to circuit breakers designed to protect electrical circuits from overload currents and short circuits. The invention relates to circuit breakers designed to protect electrical circuits from overload currents and short circuits. The electromagnetic disconnector regulator is configured to rotate around its axis, has a curved surface, the shape of which is determined by the dependence of the force of the return spring on its extension, and when rotated by a ledge, it unfolds the adjustment rail of the electromagnetic disconnector, thereby changing the tension of the tenfold current setpoint adjusting spring. In the position of the electromagnetic disconnector regulator for a five-fold current setpoint, the armature of the electromagnetic disconnector, when triggered, overcomes only the force of the five-fold setpoint adjustment spring, while the ten-fold setpoint adjustment spring is not deformed and does not generate force. In the ten-fold setpoint regulator position, the electromagnetic disconnector armature overcomes the calibrated force of the ten-fold setpoint adjustment spring and the five-fold setpoint adjustment spring. While being attracted to the magnetic circuit, the armature unfolds the release rail, which leads to the tripping of the automatic circuit breaker. The thermal disconnector regulator is configured to rotate around its axis, during rotation, the thermal disconnector adjusting rail moves linearly along the rotation axis of the main circuit breaker rail, thereby changing the gap between the adjusting screw and the complex-shape projections of the thermal disconnector adjusting rail.

EFFECT: providing adjustment of the setpoint of the thermal disconnector and the electromagnetic disconnector of the circuit breaker and providing, at the manufacturing stage of the circuit breaker, calibration of the specified trip current for each pole for a fivefold and tenfold current setpoint, whereas calibrating the pre-set trip current for a tenfold setpoint does not affect the specified trip current for a fivefold setpoint.

1 cl, 4 dwg