摘要:
A heat sink is for an integrally fused low-voltage power air circuit breaker including a line terminal and electrical bus work coupled to a current limiter. The line terminal, electrical bus work, and current limiter contribute to the formation of a thermal dam. The heat sink includes a heat exchanger structured to be coupled to the line terminal at or about the current limiter in order to expel heat from the thermal dam. The heat exchanger comprises at least one conductive member having a first end, a second end, and a plurality of bends therebetween. The heat exchanger includes heat reduction features, such as, for example, two conductive members having a number of air gaps therebetween to facilitate heat convection, a dark coating to expel heat, materials having a high thermal conductivity, and surface-enlarging mechanisms such as fins, flanges and apertures.
摘要:
A heat sink is for an integrally fused low-voltage power air circuit breaker including a line terminal and electrical bus work coupled to a current limiter. The line terminal, electrical bus work, and current limiter contribute to the formation of a thermal dam. The heat sink includes a heat exchanger structured to be coupled to the line terminal at or about the current limiter in order to expel heat from the thermal dam. The heat exchanger comprises at least one conductive member having a first end, a second end, and a plurality of bends therebetween. The heat exchanger includes heat reduction features, such as, for example, two conductive members having a number of air gaps therebetween to facilitate heat convection, a dark coating to expel heat, materials having a high thermal conductivity, and surface-enlarging mechanisms such as fins, flanges and apertures.
摘要:
A levering assembly for an electrical switching apparatus, such as a circuit breaker, which is removably disposed in a cassette, includes a mounting member coupled to the housing of the circuit breaker. A drive assembly is coupled to the mounting member and cooperates with the cassette. A powered actuator, such as an electric motor, is disposed on the mounting member and actuates the drive assembly to move the circuit breaker with respect to the cassette. The powered actuator is disposed within the housing of the circuit breaker. The mounting member, drive assembly and powered actuator form a self-contained sub-assembly, which is substantially disposed behind the circuit breaker cover. The levering assembly is operable from a remote location to automatically move the circuit breaker with respect to the cassette, to provide enhanced safety among other benefits.
摘要:
The closing protection mechanism provided herein includes a control unit, a sensing switch and a sensing switch actuator. The control unit is coupled to, and in electronic communication with, the trip device. The control unit is structured to receive a sensing switch signal and to provide a control signal to the trip device. The sensing switch coupled to, and in electronic communication with, the control unit. The sensing switch is disposed adjacent to the toggle assembly. The sensing switch is structured to provide a sensing switch signal to the control unit. The sensing switch actuator is disposed on the toggle assembly. The sensing switch actuator is structured to actuate the sensing switch. The sensing switch is structured to be actuated by the sensing switch actuator when the toggle assembly is in the second, over-toggle configuration.
摘要:
A latch engagement control mechanism is provided for a latch assembly of a circuit breaker including a housing, separable contacts, and an operating mechanism having a pole shaft, and at least one link coupled to the pole shaft. The latch assembly includes a pivot member cooperable with such link. The latch engagement control mechanism includes a latch pin having a cut-out portion and pivoting among a first position in which the latch pin prevents the pivot member from pivoting, and a second position in which the cut-out portion provides a clearance for the pivot member to pivot. A latch member coupled to the latch pin at or about the cut-out portion, includes at least a first protrusion engageable by the pivot member to establish the first position of the latch pin.
摘要:
A spring assembly is provided for a yoke assembly of an electrical switching apparatus including a housing, separable contacts enclosed by the housing, and an operating mechanism structured to open and close the separable contacts. The operating mechanism includes a pole shaft. The yoke assembly is coupled to the pole shaft and is movable among first and second positions corresponding to the separable contacts being closed and open, respectively. The spring assembly includes a number of first springs having a first spring rate and being coupled to the yoke assembly, and a number of second springs having a second spring rate and being coupled to the yoke assembly. The second spring rate is different than the first spring rate. The number of first springs and the number of second springs bias the yoke assembly toward the second position.
摘要:
A pole shaft assembly for a circuit breaker includes a receiving portion disposed on the exterior side of the housing, a pole shaft pivotably disposed within the receiving portion and including at least one protrusion, a number of cover members overlaying the pole shaft and the receiving portion, at least one first seal disposed between the receiving portion and a corresponding protrusion, and at least one second seal disposed between such protrusion and a corresponding one of the cover members. The seals resist undesired entry of debris between the receiving portion and the pole shaft, and control the discharge of arc gases from the circuit breaker. The first seal is formed by the interaction between the receiving portion and the corresponding protrusion. The second seal is formed by the interaction between the protrusion and the corresponding one of the cover members.
摘要:
A door interlock assembly is for a draw-out circuit breaker assembly. A draw-out circuit breaker is housed within an enclosure including a door and includes a poleshaft operable between first and second positions corresponding to separable contacts being opened and closed, respectively. The door interlock assembly includes a pivot member coupled to the poleshaft and a door latch interconnected to the pivot member by a linkage, such as a threaded drive rod. The door latch pivots such that a first end thereof engages and locks the door of the enclosure when the poleshaft moves to the second position. An optional mechanical sensor assembly adapted to trip the circuit breaker when the door is positioned in any position other than closed, is also disclosed.
摘要:
A charging handle is provided for an electrical switching apparatus including a housing having an exterior, an interior and a recess extending from the exterior toward the interior, separable contacts enclosed by the housing, an operating mechanism for opening and closing the separable contacts, and a charging assembly. A first end of the charging handle is coupled to the charging assembly within the interior of the housing. The second end includes a finger pull. An elongated body extends between the first and second ends and includes first and second sides, and inner and outer surfaces. The charging handle is movable among first and second positions. The finger pull is disposed on the outer surface of the elongated body at or about the second end of the charging handle, and is readily accessible from all of the second end and the first and second sides of the charging handle.
摘要:
A levering assembly is provided for an electrical switching apparatus, such as a circuit breaker, which is removably disposed in a cassette. The levering assembly includes a mounting member coupled to the housing of the circuit breaker. A drive assembly is coupled to the mounting member and cooperates with the cassette. A powered actuator, such as an electric motor, is disposed on the mounting member and actuates the drive assembly to move the circuit breaker with respect to the cassette. The powered actuator is disposed within the housing of the circuit breaker. The mounting member, drive assembly and powered actuator form a self-contained sub-assembly, which is substantially disposed behind the circuit breaker cover. The levering assembly is operable from a remote location to automatically move the circuit breaker with respect to the cassette, to provide enhanced safety among other benefits.