Abstract: Disclosed in a differential operational amplifier for use with a proximity type pick up. It has a common mode rejection input circuit comprising a diode and transistor connected to each input as well as diodes connected across the amplifier differential inputs. Common mode signals are clamped at the input to both protect the amplifier and prevent false transitions at the output.

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. 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. The circuit breaker provides a significantly improved motor protection characteristic.