Abstract: Disclosed is a snap action circuit breaker with a compact one piece steel frame in a two part, telescoping molded circuit breaker case. The compact construction is combined with a symmetrical toggle actuator to provide a pleasing appearance suitable for mounting at readily accessible and visible locations on the front of an instrument panel. A variety of handle constructions are usable with the same basic mechanism. By providing a snap actuated contact construction with substantial overcurrent trip delay the device combines the best features of modern manual switches and circuit breakers so that it is in effect a manual switch with nuisance free over-current trip protection.

Abstract: Disclosed is a circuit for producing an alarm or shut down signal when the ratio of engine speed to engine oil pressure of a tractor engine becomes excessive. A frequency signal from a speed transducer is applied to a digital counter having a counting cycle varied in accordance with a voltage signal from a pressure transducer. The voltage signal is converted to current and used to determine the period of a one shot multivibrator.

Abstract: Disclosed is a molded case type magnetic circuit breaker having improved performance and an increased current rating. A corrosion and temperature resistant stainless steel wire screen having specific wire and mesh opening sizes overlies a novel exhaust gas baffle arrangement to cool and disperse arc chamber gases venting from the breaker. Flashover during high current switching, due to conduction through the exhaust gas plasma, is eliminated. Also disclosed is a novel arc chamber construction for the circuit breaker and a marine baffle for adapting the breaker to use in potentially explosive atmospheres.

Abstract: Disclosed is a magnetic circuit breaker having improved delay characteristics and particularly improved pulse tolerance. The trip coil of the breaker is spaced from the magnetic pole piece of a delay tube by a non-conductive, non-magnetic gap and the delay core is elongated to extend in its normal biased position through the electrical center of the coil. An inertia wheel is mechanically coupled to the trip armature to further increase pulse tolerance so as to reduce nuisance tripping in the presence of high but very short term overcurrents.

Abstract: A toggle switch housed in a body and including a generally rectangular conductive blade pivotally mounted on a central conductive terminal post provided with fulcrum support means including one or two fulcrum supports, the blade being capable of assuming two or three operative positions relative to a pair of conductive terminal posts flanking the central post, depending upon pivotal swinging of the blade about the fulcrum support means, which contacts the blade centrally of its width. A dielectric actuator tip, pivotally mounted centrally in the body, is resiliently biased toward the blade and includes a bifurcated portion terminating in a pair of spaced toes slidably contacting the blade along parallel paths spaced on opposite sides of the fulcrum support means.