Abstract: A UPS power distribution panel which includes means for detecting and differentiating between a symmetrical current waveform and a non-symmetrical current waveform and means for tripping and clearing a circuit breaker in the former but not the latter condition within one current waveform cycle.

Abstract: A power supply for point-of-sale (POS) devices. The power supply comprises a transformer with first through fourth windings. An AC input is connected through a backfeed relay to the first winding. An AC output is also connected to the first winding. A battery and an inverter are connected to the second winding. A charger is connected to the third winding. A rectifier, DC/DC regulator and a DC output are connected to the fourth winding. When AC power is received at the AC input, the AC output and the transformer receive the AC power through the backfeed relay. The DC output receives DC power through the DC/DC regulator and the rectifier, which receives AC power through the transformer. When AC power is not received at the AC input, the battery and the inverter provide AC power to the transformer, and the AC output and the rectifier receive AC power from the transformer. The DC output receives DC power through the DC/DC regulator and the rectifier.

Abstract: A power supply for point-of-sale (POS) devices. The power supply comprises a transformer with first through fourth windings. An AC input is connected through a backfeed relay to the first winding. An AC output is also connected to the first winding. A battery and an inverter are connected to the second winding. A charger is connected to the third winding. A rectifier, DC/DC regulator and a DC output are connected to the fourth winding. When AC power is received at the AC input, the AC output and the transformer receive the AC power through the backfeed relay. The DC output receives DC power through the DC/DC regulator and the rectifier, which receives AC power through the transformer. When AC power is not received at the AC input, the battery and the inverter provide AC power to the transformer, and the AC output and the rectifier receive AC power from the transformer. The DC output receives DC power through the DC/DC regulator and the rectifier.

Abstract: A UPS power distribution panel which includes means for detecting and differentiating between a symmetrical current waveform and a non-symmetrical current waveform and means for tripping and clearing a circuit breaker in the former but not the latter condition within one current waveform cycle.

Abstract: This invention relates to a communication line filter for use in series with communication lines. The communication line filter provides for surge protection from voltage spikes and provides frequency filtering to remove selected interference signals from other radiating sources. The communication line filter comprises: two signal conductors linked together by a fuse; a common signal ground; and two shunts for shunting a surge current between the signal conductors and the common signal ground. The shunts provide protection from short duration voltage spikes while the fuse provides protection from longer duration overvoltages. The communication line filter functions effectively, independent of the direction of current flow along the communication line with respect the line filter. The two shunts and the fuse are selected to provide the required capacitance and impedance respectively, to form a suitable frequency notch filter.

Abstract: A bag holder for holding the mouth of a bag open comprises a member defining an opening adapted to be received in the mouth of a bag and a flexible, resilient, elongate loop adapted for location around the exterior of the bag and the member to retain the bag on the member and hold the mouth of the bag open. The holder may be provided in the form of a kit of parts, the member being formed of elongate first and second parts of thin and flat edge overall, the first part being relatively rigid and the second part more flexible and longer than the first part. The free ends of the second part are adapted for engaging respective end portions of the first part to form the parts into a bow-shaped configuration defining an opening.