Abstract: A battery reverse polarity protection circuit is disclosed. The battery reverse polarity protection circuit includes a field effect transistor (FET) coupled to a control circuit. The FET is configured to transmit an input voltage from a normal-polarity-connected battery to an output terminal, and block the input voltage from a reverses polarity-connected battery to the output terminal. The control circuit is coupled to the input terminal, the output terminal, and a common terminal and is configured to detect, during transmission of the input voltage from the normal-polarity-connected battery to the output terminal, that the input voltage is less than an output voltage, indicating onset of an abnormal operating mode, and turn off the FET to prevent the output voltage from being affected by the input voltage during the abnormal operating mode.

Abstract: A filtering device includes a filtering circuit that connects a voltage source to a sensor and a switching circuit connected in parallel with the filtering circuit that allows current from the voltage source to bypass the filtering circuit and flow through the switching circuit. The switching circuit receives a mode signal from the sensor that indicates whether the sensor is in a high current or a low current mode, the switching circuit closes when the sensor is in the high current mode, and the switching circuit is opens when the sensor is in the low current mode.

Abstract: A filtering device includes a filtering circuit that connects a voltage source to a sensor and a switching circuit connected in parallel with the filtering circuit that allows current from the voltage source to bypass the filtering circuit and flow through the switching circuit. The switching circuit receives a mode signal from the sensor that indicates whether the sensor is in a high current or a low current mode, the switching circuit closes when the sensor is in the high current mode, and the switching circuit is opens when the sensor is in the low current mode.

Abstract: A battery reverse polarity protection circuit is disclosed. The battery reverse polarity protection circuit includes a field effect transistor (FET) coupled to a control circuit. The FET is configured to transmit an input voltage from a normal-polarity-connected battery to an output terminal, and block the input voltage from a reverses polarity-connected battery to the output terminal. The control circuit is coupled to the input terminal, the output terminal, and a common terminal and is configured to detect, during transmission of the input voltage from the normal-polarity-connected battery to the output terminal, that the input voltage is less than an output voltage, indicating onset of an abnormal operating mode, and turn off the FET to prevent the output voltage from being affected by the input voltage during the abnormal operating mode.

Abstract: At least one live conductor and one neutral strap are provided for an electricity meter, the respective inlets and outlets of the live conductor and of the neutral strap being disposed inside the meter housing parallel to one another and being coplanar. A metal bar connected to neutral is disposed inside the meter housing in the vicinity of and at a short distance from the inlet and/or the outlet of the live conductor to define a gap in which a controlled arc between the live conductor and the metal bar can propagate in the event of a surge.