摘要:
Cradle-assist assemblies attached to the breaker cradle housing and/or base or residing at least partially in the breaker cradle housing and/or base include at least one actuator configured to laterally translate the at least one right and the at least one left lock members from the extended lock position to the retracted unlocked position in response to input from a user. The at least one actuator and/or transverse member(s) can be held in a defined position so that the lock members of the cradle can be locked in the respective retracted or extended positions until the cradle assist (internal) lock is manually or automatically released.
摘要:
In an overload relay, a tripping actuator 12 has a first magnet 18 and a moveable contact carrier 20 has a second magnet 28 mounted opposed to the first magnet. A moveable contact 22 on the moveable contact carrier is urged by repulsion between the magnets, to make a normally closed connection with a stationary contact 24, when the tripping actuator is in an ON position 15 and the contact carrier in a first stable position 26′. The magnets pass through an over-center tripping position (T) when the tripping actuator is moved to an OFF position 23 in response to an overcurrent condition sensed by a bimetallic thermal overload sensor 16. The magnets repel each other after passing through the over-center tripping position, to thereby urge the moveable contact into a second stable position 26, away from the stationary contact, to break the normally closed connection with the stationary contact.
摘要:
A circuit breaker having a movable contact arm for opening and closing the circuit which is controlled separately by a circuit breaker mechanism for circuit protection and by a switch lever mechanism which does not require actuation of the circuit breaker mechanism to function. The switch lever may also be activated remotely by a remote actuator, for example, a solenoid. A manual reset mechanism is provided so that, actuation of which, when power has been lost to the remote actuator when the remote actuator is in the off position, moves the remote actuator to the on position, thereby resetting the circuit to the closed state.
摘要:
A switching device is provided that includes a switching mechanism unit and a switch drive control circuit. In the switching device, an operating member is maintained in an ON position by the sucking force of a permanent magnet and a yoke, despite the pushing force of a biasing unit, when the permanent magnet is in an ON position. The yoke is magnetized in such a manner as to reduce the magnetic force of the permanent magnet, when a coil wound around the yoke is energized by the switch drive control unit. The operating member and a switching member are moved from the ON position to the OFF position by virtue of the pushing force of the biasing unit, thereby shutting a feed line.
摘要:
An electromagnetic actuator (1) of the type of a relay, having an armature (2) polarized by a permanent magnet (5) and a movable drive element (6) attracted by the armature (2) against a spring means (8), incorporates an electric current sensor consisting of a toroidal transformer (16) penetrated by at least one conductor (17) from an electric power supply line. The actuator (1) of this invention has a major advantage in that it can combine in a single device the functions of sensing differential currents on the line and of tripping off the break mechanism of a protection breaker, within a highly compact volume.
摘要:
A resettable switching apparatus for selectively interrupting a circuit connecting power from a first terminal to a second terminal when a ground fault occurs. The apparatus may be manually or electrically set. However, the contacts are held by a permanent magnet in the closed position such that no current is required. When a ground fault is detected, a current is generated to force the contacts to the open position.
摘要:
A combined trip actuator and accessory module for molded case circuit breakers is accessible in the field for user selected accessory options. The trip actuator includes a U-shaped stator with a permanent magnet at the end of one leg. A spring-loaded armature member extends across both legs to form a closed-loop magnetic circuit. The over-current trip coil and shunt trip coil are arranged on one leg with the undervoltage coil arranged on the other leg. The accessory module is accessible from the top surface of the breaker cover for field installation of the undervoltage and shunt trip coils to provide the corresponding undervoltage and shunt trip functions.
摘要:
A combination motor-starter circuit breaker comprising a single set of separable contacts and providing the function of motor starting, circuit interruption, and current limiting. The combination employs three separate means for separating the contacts to provide these functions; a solenoid, an overcurrent trip mechanism, and a magnetic drive device for high overcurrent conditions. Arc rails and spaced conductive plates are provided to aid in extinguishing any arcs established. Movable contacts are mounted on a bridging contact arm which can be provided with two open positions, a first position for use during motor control wherein the contacts are separated by a relatively small distance and a second position for use during circuit interruption and current limiting.
摘要:
Disclosed is a circuit breaker which may be operated on relatively low power. It comprises a polarized relay having a spring-biased armature rotatable to trip a conventional circuit breaker toggle. The armature is released by the flux from a low power coil bucking out the polarizing flux from a permanent magnet. The breaker is disclosed in overvoltage protection and/or undervoltage protections circuits, as well as in a ground fault interruption circuit, and may be used with a conventional breaker overcurrent coil and toggle trip assembly.
摘要:
An overload switch having a core associated with a permanent magnet with two sets of limbs and armatures associated with each set connected by a lever. The sets of limbs are provided with windings which are wound so that a current in the windings increases the magnetic attraction in the case of one armature, but decreases it in the case of the other armature. At a predetermined current level, a spring pivots the lever to release a catch to open the switch.