Abstract: An electric motor includes a stator and a rotor. The stator has a plurality of low speed windings and a plurality of separate high speed windings. A first type of thermal overload protector is coupled with at least one of the low speed windings and a second type of thermal overload protector is coupled with at least one of the high speed windings.

Abstract: A thermal overload relay includes a main bimetal for detection of an overload current, a shifter associated with the main bimetal, a release lever working according to a displacement of the shifter, a contact reversing mechanism for changing-over contacts by reversing action caused by rotation of the release lever, and a manipulation structure for manipulating the release lever and the contact reversing mechanism. The manipulation structure includes a reset bar for returning the contact reversing mechanism to an initial state. The reset bar is arranged to change-over between a manual reset state in which the reset bar can be pushed-in and an automatic reset state in which the reset bar is pushed-in and turned from the manual reset state and held in that state.

Abstract: A thermal overload relay is provided with an external case, and an adjustment dial with a cam inserted into an adjustment dial insertion hole provided in the external case for adjusting a settling current. A press-fitting section is provided at one of the adjustment dial and the adjustment dial insertion hole, and a locking section is provided at the other of the adjustment dial and the adjustment dial insertion hole. The press-fitting section is press-fit and retained in the locking section.

Abstract: The electrical motor protector includes a housing being constructed of an electrical conductive material and having a first electrical contact disposed therein. Within the housing, a movable cantilever assembly is disposed and carries a second electrical contact thereon. Upon malfunction or overheating of the motor, the motor protector will break electrical connection between the first and second contacts to thereby interrupt electrical current to the motor, to render the motor inoperative.The cantilever assembly will be responsive to temperature wherein overheating of the motor will act to break the electrical connection between the first and second contacts, after which the motor will have a chance to cool before electrical connection is remade. The cantilever assembly includes first and second cantilevers which act in conjunction with one another to increase the cycle time of the device as well as providing a variety of other benefits and advantages.

Abstract: A control device is shown for a fuel supply system for an automotive engine having a heater which is energized, deenergized and then reenergized in sequence to heat a thermostat metal coil spring over a selected temperature range to regulate opening of a carburetor choke during engine warm up. Contacts are connected between a power source and the heater and a pair of dished bimetal elements having central apertures therein are arranged in facing relation to each other between the contacts, the bimetal elements being adapted to move to inverted dished configuration as they are heated to respective different temperatures within the noted temperature range. The contacts are engaged with each other through the element apertures when engine operation is initiated, are separated when one of the elements moves to its inverted configuration in response to heating of the element, and are then reengaged as the second element moves to its inverted configuration in response to further heating.

Abstract: An electric switch that is temperature responsive is provided for operation in a temperature range that is substantially above normal ambient temperature. A pair of contacts are mounted on respective first and second spring members. The second spring member includes a bimetal compensating portion at the distal end thereof. The second contact is mounted on the compensating portion so that upon increasing the temperature of the switch structure, the second contact moves toward engagement with the first contact to eliminate initial overshoot and to compensate for variable contact weld size between the contacts. An operating bimetal assembly in direct contact with the heated surface being monitored is used to break the contacts. The bimetal assembly includes a bimetal base element and a metal element butt-welded to the distal end thereof. The metal element carries a ceramic button to engage the first or upper spring member to move the first contact.

Abstract: A thermal relay is disclosed which provides a bi-metal snap disc actuator system. The actuator system includes a central divider of material having relatively low thermal conductivity and a metallic disc cup mounted on each side of the central divider. A bi-metal snap disc is located in each disc cup and a separate heater is provided to respectively heat the discs. The discs are mounted so that they tend to move toward each other at normal environmental temperatures and a bumper is interposed between the discs to cause them to move in with snap action in the unison. The actuator operates two switches. In one embodiment, one switch is normally closed and the other switch is normally open. In another embodiment, both switches are normally open.

Abstract: A tripping device for a thermal protection relay, particularly a bimetal relay, has a pivoted U-shaped support bracket for a tripping lever, can be adjusted by means of an adjusting dog, and acts on a set of contacts. The U-shaped support bracket has a crosspiece which carries one end of U-shaped temperature compensation strip. The other end of the strip rests against the adjusting dog. The support bracket has support points for the support bracket and the tripping lever lying one behind another in the longitudinal direction of the bracket legs, starting at the crosspiece.This relay design results in reduced cost of assembly and in reduced overall relay size. Also, a heretofore required contact pressure spring for the temperature compensation strip is dispensed with.

Abstract: One reed of a pair of parallel reeds has a rod extending to opposite sides of the pair. A bimetallic snap disc can be heated to snap against one end of the rod and thus flex the reed to engage a contact on that reed with a contact on the other reed and thus close a circuit to be controlled. A resilient latch holds that reed in its flexed position, even after the disc cools and snaps back to its normal configuration, until a second snap disc is heated and pushes the rod and reed back to its open-contact position. A selectively operable switch serves to provide electric current to a selected one of a pair of resistance heaters, one heater being near each of the snap discs.

Abstract: A housing is disclosed in which a positive temperature coefficient (PTC) of resistivity element is mounted a selected distance from but in thermal communication with a thermostatic switch also mounted within the housing.

Abstract: A bimetallic thermo-release, especially for protective motor switches, comprising at least one bimetallic release element connected with connections for the connection of electrical lines or conductors. The bimetallic thermo-release having a bimetallic compensation element for temperature compensation and a release or trigger element which can be activated as a function of the bending or deflection of the bimetallic release element and the bimetallic compensation element. A heat-conducting connection is provided between the bimetallic compensation element and at least one connection at which there is connected one of the electrical lines.

Abstract: A dual temperature thermostat is disclosed in which two bimetal snap discs are connected to separately operate two switch mechanisms. The snap discs are retained in separate, generally concentric disc seats formed in a retainer cup. The body is provided with first abutment surfaces to maintain the inner disc in its seat and a plurality of symmetrically positioned projections which extend through openings in the inner disc and provide abutments which engage the outer disc and maintain it in its seat. The abutments and the seats are proportioned so that the two discs cannot contact each other during their operation.