Does your uninterruptible power supply (UPS) system allow you to transfer load to a bypass source so you can perform maintenance on system components, totally isolate a UPS from external power sources for maintenance, replace a failed inverter without interruption of power to the load, and functionally test the static transfer switch? If you answered no to any of the above, you'd better keep reading. More...

Taehwatrans manufactures a broad assortment of current transformers, from highly accurate models to zero phase versions. Supreme accuracy CTs come in Class 0.1, with a ratio error within +/-0.05%, and Class 0.2, with a ratio error within +/-0.1%. DC Immune CTs are another option; these RoHS-compliant units feature a high potentional voltage of 4KV/min and a 2,500:1 current ratio. Split-core, clamp-on, outdoor CTs offer better than 1.0 class metering accuracy, with nominal linearity within +/-1% and a frequency range from 20Hz to 400Hz. Finally, zero phase CTs provide minimum output voltage tolerance and almost no load shift, which makes them ideal for use as residual current or earth leakage circuit breakers, or application leakage circuit or ground fault interrupters.

DENT Instruments offers three types of current transformers: split core, clamp-on, and flexible, all of which produce 333 mV when at full scale. The split core series is available in several window sizes, for loads from 5A to 1,200A. Other characteristics include an epoxy-encapsulated housing, shrouded core blades for protection during installation, a snap closing/opening feature, accuracy +/-1%, and phase shift <2 degrees. Mini hinged and high accuracy models are also available in split core designs. Next, clamp-on CTs are designed for current ranges from 2A to 150A, 10A to 600A, or 10A to 1,200A AC, with a working voltage of 600Vrms. Lastly, the company's Rogowski rope-style CTs are designed to take measurements where standard current sensors cannot; models include the RoCoil mV, RoCoil (for use with PowerScout), and FLN 3000A CT.

Flex-Core carries an array of split core, flexible, clamp-on, and other current transformer types.  Models 606 and 608 are the company's basic split core CTs; they offer 1% accuracy, current ratios from 200:5 to 3,000:5, and VA burdens from 2.5 to 50. Special split core models are also available, such as low ratio, flexible, and removable leg designs. AC clamp-on CTs include the 600V class NS, H32, and P32 models for a variety of current ranges (up to 3,000AAC) and max currents (up to 4,500A). Several solid core, metering class, multi-ratio relay class, and 5KV primary current transformers are also in stock.

Since 1955, Pearson Electronics has been manufacturing current transformers that provide accurate measurement of complex current wave shapes, from microamperes to kiloamperes, as well as wideband frequency responses. These shielded and ohmically-isolated units are available in many sizes and configurations, including clamp-on.

T.I. Chen associates stocks several types of current transformers for electric power monitoring, power quality analysis, and metering applications. TA Series auxiliary CTs are printed circuit board-mounted units designed for integration into products that perform the functions already listed, as well as supervisory control and data acquisition. Wide operating range auxiliary CTs are categorized under the ECT Series; with a wide over-current operating range, they offer excellent transient event response characteristics. Next, split core CTs are available in three families: the low primary current mini CTSA Series, the mid-range primary current CTS Series, and the high primary current CTSB Series. Meanwhile, the clamp-on CT is a spring-actuated unit that permits temporary installation without disconnecting the primary current loop; it is available in the low cost LCTC Series, and the CTC Series for robust application requirements. Finally, the CTT Series is a toroidal CT meant for use in permanent installations.

Snap-on Tools is a manufacturer of a variety of electronic service pliers such wire looper jaws, long and short serrated jaws, 45 degree angled serrated jaws, short non-serrated jaws,  extra slim serrated jaws, 70 degree curved serrated jaws, extra slim non-serrated jaws, needle thin serrated and flat nose non-serrated jaws.  Cushion grip handle resists shop oil and solvents while providing maximum comfort. The spring loaded joints help with smoother operation. Snap ring retaining ring and channel lock pliers are also available. All Snap-on pliers are made in the USA. Adjustable pliers are available.

On-Q manufactures a variety of wall plates in many different colors. Models include studio wall plates in 1, 2, 3 and 4 gang configurations.

Katy Instrument Sales manufactures and distributes precision AC current sensors that feature loop-powered, two-wire transmitters and voltage rating of 5,000 volts. The company claims the current sensors never require calibration and have an extended temperature range from -25C to 85C.

AYA Instruments manufactures clamp-on current sensors for use with portable power analyzers and monitors. The current sensors can measure AC currents up to 30 amps and Dc currents up to 15,000 amps. The company's flexible current probes are single or three-phase, and feature sensing loops of 18," 24", 30", 36", and 48". The company also produces AC microclamps, mid-size AC current clamps, large Ac current clamps, AC/DC microclamps, mid-size AC/DC current clamps, and large AC/DC current clamps.

Pearson Electronics Inc. produces a number of current monitor products including current sensors, current transformers, current probes, pulse current monitors, and high frequency current transformer. The various current sensing products are available as standard, clamp-on and custom types.

Hill Supplies in Ontario sells electrical, data & communications, industrial, HVAC, and industrial equipment from manufacturers such as Gould, Siemens, Hubbell, Federal Pioneer, Hammond, Chromalox, Qmark, Repco, Honeywell, Potter & Brumfield, and Broan. Some of the products they carry include timers & photocells, wire and cable such as copper building wire, service entrance cable, cabtire, and welding cable, wiring devices, conduits, lamps, and transformers.

Guillevin International sells a wide line of electrical supplies including boxes & enclosures; conduits & raceways including cable trays, channel struts, and underground; electrical distribution products such as breakers, bus ducts, meter boxes, and transformers; and lighting including a variety of fixture types as well as ballasts, lamps, and lenses. Some of the manufacturers they carry include GE, Peerless Electric, Thomas & Betts, and Fantech.

Newark is a distributor of electrical products with a very extensive online catalog, including connectors for A/V, circular connectors, fiber optics, I/O connectors, and industrial connectors as well as electrical and circuit protection products like breakers, interrupters, conduits, fuses, and switches. They also carry test equipment, semiconductors, passives, and assorted cables and wires.

Daltco Electric is an electrical supply distributor, featuring Rittal Comfort Panels , Hammond din-rail control transformers, Philips extreme temperature system, and Rittal Climate control products. They also carry cable ties, wiring ducts, raceways, conduit fittings, and terminals from Thomas & Betts.

Rayman Electrical Sales in Ontario that carries a wide line of electrical supplies including 125 amp and 200 amp combination panel packages from Cutler-Hammer, as well as incandescent and fluorescent lamps and ballasts, wiring devices including switches and receptacles, and metal and PVC boxes.

Robertson Electric Wholesale is an electrical products distributor in Ontario, Canada featuring Cementex safety solutions including double insulated 1000V safety tools and arc flash clothing including screwdrivers, pliers, and cable cutters as well as arc flash hoods, face shields, and cooling vests. They also sell a wide line of electrical products including conduits, circuit breakers, controls, connectors, raceways, relays, and reels.

The Wiring Mart is an electrical products distributor for industrial, commercial, and residential applications, featuring the Panasonic Whisper Green Exhaust fan with motion sensor. They also carry items including lamps, ballasts, fans, hoods, heaters, meters & test equipment, and outlet boxes.

Aztec Electrical Supply is a distributor of automation, control, electrical, safety, sensing and vision products in Canada, for automation and industrial electrical needs. Manufacturers that they carry include Omron, Eaton-Cutler Hammer, Phoenix Contact and Hubbell, plus many other industrial automation and electrical manufacturers.