Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1979-04-30
1981-01-27
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200144R, H01N 3310
Patent
active
042477468
ABSTRACT:
In the or each pole of an electric circuit breaker, the or each moving contact arm is mounted. by a pivot pin, upon a carrier, in such a manner as to permit lost motion between the arm and the carrier, the arm being spring-loaded towards an operative position wherein a moving contact carried by the arm engages with a fixed contact. A tripping mechanism serves, upon passage of an overload slightly in excess of the rated current, or upon short circuit, to rotate the carrier so as to lift the movable contact away from the fixed contact. Arc-quenching plates are so slotted, each with a respective key-hole shaped slot, and are so positioned that electromagnetic forces, set up upon short-circuit, tend to blow back the moving contact arm, to separate the contact from the fixed contact, thereby initiating circuit interruption even before the actual tripping mechanism has started to initiate contact opening. To ensure optimum blow-back effect, the arms of the quenching plates extend towards the pivot pin by a distance which is from 30% to 70% of the entire distance between the movable contact and the pivot pin.
REFERENCES:
patent: 2372045 (1945-03-01), Armstrong
patent: 2626331 (1953-01-01), Basnett
patent: 3071666 (1963-01-01), Ellsworth et al.
Dorman Smith Switchgear Limited
Macon Robert S.
LandOfFree
Electric circuit breaker does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electric circuit breaker, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric circuit breaker will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1183208