Abstract: A start-up switch 50 for an electric motor 1 comprises a resistive element (54) which is so constituted as to be connectable to an electric current path (15) and which has such a characteristic that its resistance value increases by the heat generated by electric current that flows through the electric current path (15) and a thermostatic switch (60) which is connected in series with the resistive element (54). The thermostatic switch (60) has an actuation member (60) which is responsive to temperature so that upon reaching a preselected temperature, said member moves from a closed current path position to an open current path position. The thermostatic switch (60) is positioned to be in direct heat transfer relationship with the resistive element (54) so that the member will (66) rise in temperature as the resistive element (54) rises in temperature.

Abstract: A start-up switch 50 for an electric motor 1 comprises a resistive element (54) which is so constituted as to be connectable to an electric current path (15) and which has such a characteristic that its resistance value increases by the heat generated by electric current that flows through the electric current path (15) and a thermostatic switch (60) which is connected in series with the resistive element (54). The thermostatic switch (60) has an actuation member (60) which is responsive to temperature so that upon reaching a preselected temperature, said member moves from a closed current path position to an open current path position. The thermostatic switch (60) is positioned to be in direct heat transfer relationship with the resistive element (54) so that the member will (66) rise in temperature as the resistive element (54) rises in temperature.

Abstract: A motor protector (1, 1A) for connection in a circuit for supplying electrical power to a motor (36) to be protected includes first (S1), second (S2) and third (S3) switches in a housing member (2, 3). Each switch (S1, S2, S3) uses a snap-acting bimetallic member (8, 11, 13) for opening and closing electrical contacts (4a and 5a, 8a and 8b; 17 and 27; 18 and 30) of the respective switch. The switches (S1, S2, S3) in the housing member (2, 3) are connected as part of the circuit supplying electrical power to the motor (36) being electrically connected in series with one another so that the opening of any one of them will stop the flow of power to the motor (36) to be protected.

Abstract: A motor protector (1) for use in an electrical circuit for supplying current to a motor (10) to be protected having two separate bimetallic disk actuated switches (4, 5) contained within the protector (1) electrically connected in series with each other and the current source (13) and motor (10). In one embodiment, one of the two switches (6) uses a two bimetallic disk design in which the disks have different temperature actuations and reset values for providing a fail-safe feature.

Abstract: The phase relation of clock signals to be applied to an interleave type analog-to-digital conversion apparatus having N analog-to-digital converters is calibrated by applying a repetitive reference signal to the N analog-to-digital converters. The digital values from the N analog-to-digital converters are selected at corresponding sampling points of successive cycles of the reference signal. The clock phase relation is adjusted such that the selected digital values are made substantially equal to each other.