4results about "Switch operated by falling voltage" patented technology

The present invention relates to a manual motor starter and, more specifically, to a trip device for a manual motor starter. A trip device for a manual motor starter according to an embodiment of the present invention comprises: a trip unit body forming the base of a trip unit; a fixed contact coupled to the lower portion of the trip unit body; a heater assembly inserted and coupled to the trip unit body and detecting the heat variation; a coil coupled to the upper portion of the trip unit body; a core unit inserted into the coil; a terminal rod coupled to the core unit and the trip unit body, and having one end portion forming a terminal unit; and an instant trip lever which is rotatably coupled to the trip unit body and is operated by the core unit, wherein a coil attachment portion in which the coil is inserted and installed protrudes from the trip unit body.

The application discloses a spring operating device with under-voltage tripping and manual locking functions and relates to the technical field of high-voltage switches.The spring operating device comprises a mechanism box, an output crank arm and a tripping pin shaft are arranged on a spring operating assembly, a main tripping electromagnet is arranged at the front end of the tripping pin shaft, an under-voltage tripping assembly is arranged side by side with the main tripping electromagnet and comprises a front-end electromagnet and a rear-end electromagnet connected in series, the striker rod of the under-voltage tripping assembly is extended to hit the tripping pin shaft when power is lost, a plug plate is movably arranged between the front-end electromagnet and the rear-end electromagnet, the plug plate is provided with a U-shaped groove for blocking the striker rod of the front-end electromagnet from being extended when the plug plate is in a locking position, a manual locking assembly is arranged on the mechanism box and is in transmission connection with the plug plate through a steel wire rope, and the manual locking assembly is used for driving the plug plate to switch between a locking position and an unlocking position.The spring operating device realizes automatic tripping protection when power is lost, can mechanically lock the under-voltage tripping function through the manual locking assembly, ensures the safety of maintenance, and has the advantages of compact structure, high modularization degree and convenient operation.

Undervoltage release (5) of a circuit breaker (1), comprising undervoltage release (5) - a capacitor storage device (7) designed to store a trigger energy (15), - a trip unit (9) which is configured to activate a trip unit (3) to switch off the circuit breaker (1) when the trip energy (15) is supplied to the trip unit (9), and - a monitoring unit (13) configured to monitor an auxiliary voltage (19) and to supply the release energy (15) stored by the capacitor storage (7) to the release unit (9) when the auxiliary voltage (19) falls below a threshold value stored by the monitoring unit (13), with a charging unit (11) configured to charge the capacitor storage (7), wherein the monitoring unit (13) is configured to control the charging unit (11).

The invention relates to an undervoltage release (5) of a circuit breaker (1). The undervoltage release (5) comprises a capacitor storage unit (7) which is designed to store a release energy (15), a release unit (9) which is designed to activate a switch-off unit (3) for switching off the circuit breaker (1) when the release energy (15) is supplied to the release unit (9), and a monitoring unit (13) which is designed to monitor an auxiliary voltage (19) and to supply the release energy (15) stored by the capacitor storage unit (7) to the release unit (9) when the auxiliary voltage (19) falls below a threshold value stored by the monitoring unit (13).