Abstract:
A circuit interrupter that includes a passive integration channel structured to receive an output signal from a di/dt current sensor and generate a first signal output based on the output signal, and an active integration channel structured to receive the output signal from the di/dt current sensor and generate a second signal output based on the output signal that is proportional to the primary current received by the di/dt current sensor. Circuit protection functionality is provided based on the first signal output responsive to the primary current being determined to be greater than a threshold level, current metering and circuit protection functionality is provided based on the second signal output responsive to the primary current being determined to be less than or equal to the threshold level, and a seed current value is provided to the active integrator based on the first signal output.
Abstract:
A circuit interrupter includes a first terminal structured to electrically connect to a power source, a second terminal structured to electrically connect to a load, separable contacts electrically connected between the first terminal and the second terminal and being moveable between a closed position and an open position, an operating mechanism structured to trip open the separable contacts, an electronic trip unit structured to detect a fault condition based on power flowing between the first and second terminals and to retrieve diagnostic or setting information associated with the circuit interrupter, and a wireless unit structured to provide the setting or diagnostic information associated with the circuit interrupter to an external device via a wireless communication protocol.
Abstract:
A wire wound resistor arrangement including a plurality of wire wound resistors electrically connected in a series connection, a first terminal disposed at a first end of the series connection of wire wound resistors, and a second terminal disposed at a second end of the series connection of wire wound resistors. The wire wound resistors are arranged in a polygonal shape having at least three vertices the first terminal and the second terminal are disposed at one of the vertices.
Abstract:
A power supply circuit for a trip unit of a circuit interrupter includes a current transformer, a startup circuit receiving a regulated voltage and a DC/DC converter. The startup circuit is structured to: (i) burden the current transformer with an impedance approximating the trip unit and cause the DC/DC converter to enter the shutdown mode when the regulated voltage is below a predetermined value, (ii) remove the burden and cause the DC/DC converter to exit the shutdown mode and provide power to the trip unit responsive to the regulated voltage reaching the predetermined value, and (iii) remove the burden and cause the DC/DC converter to exit the shutdown mode and provide power to the trip unit responsive to a rate of change of the regulated voltage being at least a predetermined level.
Abstract:
A circuit interrupter that includes a passive integration channel structured to receive an output signal from a di/dt current sensor and generate a first signal output based on the output signal, and an active integration channel structured to receive the output signal from the di/dt current sensor and generate a second signal output based on the output signal that is proportional to the primary current received by the di/dt current sensor. Circuit protection functionality is provided based on the first signal output responsive to the primary current being determined to be greater than a threshold level, current metering and circuit protection functionality is provided based on the second signal output responsive to the primary current being determined to be less than or equal to the threshold level, and a seed current value is provided to the active integrator based on the first signal output.
Abstract:
An electrical switching apparatus includes a housing, a line terminal, a load terminal, separable contacts disposed on a conductive path between the line terminal and the load terminal, an operating mechanism structured to open and close said separable contacts, said operating mechanism including a trip bar, and an electronic trip unit. The electrical switching apparatus also includes a trip actuator assembly including an actuator housing coupled to said housing, an actuator coupled to said actuator housing, and a connector structured to electrically connect the actuator to an electronic trip unit. The electrical switching apparatus further includes a current transformer assembly including a rod-shaped conductor electrically coupled to the load terminal and a current transformer disposed around the rod-shaped conductor, wherein the electronic trip unit is structured to electrically control actuation of the actuator.
Abstract:
A power supply circuit for a trip unit of a circuit interrupter includes a current transformer, a startup circuit receiving a regulated voltage and a DC/DC converter. The startup circuit is structured to: (i) burden the current transformer with an impedance approximating the trip unit and cause the DC/DC converter to enter the shutdown mode when the regulated voltage is below a predetermined value, (ii) remove the burden and cause the DC/DC converter to exit the shutdown mode and provide power to the trip unit responsive to the regulated voltage reaching the predetermined value, and (iii) remove the burden and cause the DC/DC converter to exit the shutdown mode and provide power to the trip unit responsive to a rate of change of the regulated voltage being at least a predetermined level.