摘要:
The present invention relates to a family of resettable circuit interrupting devices that avoid reverse wiring conditions by sensing which pair of two pairs of terminals on the circuit interrupting device is connected to a source of electricity and connecting the pair of terminals sensed as line terminals to the circuit interrupting device as the line terminals and the other pair of terminals as the load terminals.
摘要:
Resettable circuit interrupting devices, such as GFCI devices, that include reverse wiring protection, and optionally an independent trip portions and/or a reset lockout portion are provided. The reverse wiring protection operates at both the line and load sides of the device so that in the event line side wiring to the device is improperly connected to the load side, fault protection for the device remains. The trip portion operates independently of a circuit interrupting portion used to break the electrical continuity in one or more conductive paths in the device. The reset lockout portion prevents the reestablishing of electrical continuity in open conductive paths if the circuit interrupting portion is non-operational, if an open neutral condition exists or if the device is reverse wired. Methods for ensuring a reset lock out state before shipment are provided.
摘要:
A layer of thermal fusible material is placed on one surface of a metal oxide varistor (MOV) to monitor the heating of the MOV due to applied voltage spikes. The thermal fusible material is part of the electrical circuit which includes the MOV and melts at a predetermined temperature. In the presence of a severe or a number of voltage spikes the MOV heats up and the heat transferred to the thermal fusible material causes it to open the electrical circuit to the MOV to prevent overheating and thermal runaway. In another form, the MOV is separated into two halves and the thermal fusible material layer is placed between the ends of the MOV halves.
摘要:
To prevent the contacts of an electrical switch bouncing when the switch is operated, with the attendant arcing and contact erosion, spring mass mechanisms are added adjacent the spring arms and contacts to engage such spring arms and contacts and transfer the vibrational energy to such spring mass mechanisms and permit the spring arms and contacts to operate without any contact bounce. An energy absorber can be used alternatively to absorb the vibrational energy. A combination of spring mass mechanism for one spring arm/contact assembly and an absorber for the second spring arm/contact assembly can be employed.
摘要:
A stair relief device is positioned around connecting plugs, splice or the like to relieve the contained plugs, splice or the like from any tension which is in the cord. It consists of a rigid hollow cylinder having two rigid circular flanges, extending outwardly at opposite ends of the cylinder. Each of these flanges has positioned therein two slots of appropriate size and shape to permit an electrical cord to pass through the slot. On each flange the two slots are positioned one hundred and eighty degrees (180.degree.) around the flange from each other. The slots in each flange are aligned directly opposite the slots in the other flange. The section of the cord to be protected is positioned within the cylindrical portion of the device. The cord at either end of the device is then positioned back through the slots in the flanges and turned at least one hundred and eighty degrees (180.degree.) around the outer portion of the cylinder and through the corresponding slots in the other side of the flange, thereby transmitting the tension on the cords through the cylindrical body rather than through the section to be protected.
摘要:
A leakage current monitor device suitable for use in or with a Relocatable Power Tap. The device includes a leakage current detector circuit and an alarm circuit coupled thereto. The leakage current detector circuit is configured to detect leakage current from one or more loads connected to the RPT. The alarm circuit activates an alarm device when a detected leakage current exceeds a defined threshold.
摘要:
A resettable circuit interrupting device having a switch and timer circuit connected to the line side of the interrupting device to cause a leakage current to flow for a defined interval of time when power is applied. The timer and switch circuit comprises a timer powered by current from the phase leg of the device which is designed to operate for a defined interval of time. The timer starts operating when power is applied to the circuit interrupting device and normally continues to operate for the defined interval to time. Upon completion of the timed interval, the timer turns itself off and stays off until power is again applied to the device after an interruption. When power is first applied to the interrupting device, the timer is energized from the phase leg and causes the switch to close which connects the neutral leg on the line side of the interrupting device to a ground terminal. If the device is not reverse wired, the timer continues to operate and the switch remains closed until the timer completes its cycle, at which time the switch opens and the neutral leg of the device is no longer connected to the ground terminal. If the device is reverse wired, then at some instant after the switch is closed the device will sense a reverse wired fault, the switches SW1 and SW2 will open, and line power will be disconnected from the interrupting device.
摘要:
In the present invention the basic detection and interruption components of a Leakage Current Detector Interrupter (LCDI) in combination with a sensor module are coupled to a conductor such as a shield conductor of an extension or appliance cord having line, neutral, possibly ground and shield conductors to provide a new improved type of detector which interrupts current to a load when an abnormal non-electrical condition such as smoke, high heat, high or low pressure, etc. is detected by the sensor module. The sensor module in combination with the LCDI provides, either singularly or in combination, the following advantages: A sensor module that need not be rated to carry the full electrical load required by the appliance because the LCDI can operate with a nominal low current signal; Prevents the LCDI from being reset should the device become inoperative (reset lockout); Tests the integrity of the conductor from the sensor module within the extension or appliance cord, in addition to testing the functionality of the LCDI; and, Can interrupt current to the load if an electrical connection is detected between the sensor module conductor and neutral, or the sensor module conductor and ground.
摘要:
A layer of thermal fusible material is placed on one surface of a metal oxide varistor (MOV) to monitor the heating of the MOV due to applied voltage spikes. The thermal fusible material is part of the electrical circuit which includes the MOV and melts at a predetermined temperature. In the presence of a severe or a number of voltage spikes the MOV heats up and the heat transferred to the thermal fusible material causes it to open the electrical circuit to the MOV to prevent overheating and thermal runaway. In another form, the MOV is separated into two halves and the thermal fusible material layer is placed between the ends of the MOV halves.
摘要:
A heat flow detector for protecting against overheating of a lamp fixture energized from a voltage source, even when a dimmer is used for operating the lamp fixture. The detector includes a temperature sensitive switch electrically coupled to the lamp fixture. The switch disconnects the lamp fixture from the voltage source in response to a predetermined temperature. A biasing heater is thermally coupled to the temperature sensitive switch for raising the temperature of the switch sufficiently to operate the switch upon overheating of the lamp. A regulating circuit maintains the required voltage across the heater even upon reduction of the voltage from the source through use of the dimmer. The heat flow detector is placed in the vicinity of the lamp fixture so as to be subject to the same heat flow environmental conditions as the lamp fixture whereby as the lamp fixture gets overheated, the resistor heated up will be sufficient to operate the switch.