Profile: Time Mark Corporation offers a line of monitoring devices for sensing the condition of three-phase power lines. We are specialized in the design and manufacture of 3-phase sensing devices such as reverse phase detectors, phase loss sensors & phase unbalance sensors. We offer a full line of industry standard time delay relays. We also have single and 3-phase current monitors to sense over & under current conditions. Current transformers are also available. AC and DC voltage sensors are available to sense over voltage, under voltage & voltage band. Our submersible pump load sensors, sewage lift station controls, liquid level controls and sensors & motor load monitors are standard. We are actively engaged in the design, manufacture and production of special control devices under private label to OEM customers. Our socket mounted products are warranted unconditionally for a period of 5 years from the date of purchase. Our model 471 multi-stage alternator is designed to control the operating sequence of multi-stage pumping systems. It can also be used to maintain the desired level of pressure on air compressor systems. Four pump select dip switches located on the front panel allow the alternator to control a single, two, three and four-pump system. Only one switch needs to be set for the total number of pumps in the system. It is widely used in water supply, sewage disposal plant, storage tank filling, air compressor, irrigation and water recycling systems. The model 276B current transformer (CT) is a ring-type current transformer for currents from 50 to 1200 amps. It has an accuracy rating of plus/minus 2% for 50-100 amp CT's, and plus/minus 1% over 100 amps at 60 Hz. This CT also features a 25-400 Hz frequency range, #8-32 secondary terminals and mounting brackets. Polarity markings are stamped on the transformer. The model 276B is UL recognized and CSA certified.