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Darrah Electric
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LEM solutions for electrical measurements

LEM is the market leader in providing innovative and high quality solutions for measuring electrical parameters. Its core products - current and voltage transducers - are used in a broad range of applications including drives & welding, renewable energies & power supplies, traction, high precision, conventional and green vehicle businesses. With higher accuracy and speed, the feedback signal from LEM transducers enables smoother control and energy consumption reduction of many electrical systems.

Published on 03/15/19 Read Article
Heat Pipes

Heat pipes are used to carry heat over a distance with very low thermal resistance. This is very helpful when small or distant heat sources need to be dissipated over a larger area or moved to a remote heat exchanger. Heat pipes are a Fluid Phase Change application, often referred to as “re-circulating,” because they use a closed loop to transfer heat quickly through evaporation and condensation within the heat pipe.

Published on 03/08/19 Read Article
ABB IGBT Modules

Insulated gate bipolar transistor (IGBT) and diode modules with SPT and SPT+ chips. ABB’s IGBT power modules are available from 1700 to 6500 volt as single IGBT, dual/phase-leg IGBT, chopper and dual diode modules. The high-power HiPak IGBT modules feature low losses combined with soft-switching performance and record-breaking Safe Operating Area (SOA).

Published on 02/28/19 Read Article
POW-R-BLOK / POW-R-BRIK

Thyristor and Diode modules from Powerex ranging from 600V to 11,000V.

Published on 02/21/19 Read Article
Rectifier Diodes

Dynex Semiconductor’s Rectifier Diodes are rugged converters of AC to DC finding use in industrial, chemical rectifiers and aluminum pot lines.

Published on 02/14/19 Read Article
IXYS NEW 600V, 1A Power SIP Relay

The all new CPC1984Y 600V, 1A Power SIP Relay Provides Up to 4000V Input-to-Output Isolation for High-Performance Switching

Published on 02/06/19 Read Article
Liquid Cold Plate Heat Sink

A Liquid Cold Plate Heat Sink is for very high power (high heat dissipation) applications where conventional cooling is just not enough.

Published on 01/25/19 Read Article
LEM’s Current Transducer LXS series

LEMs transducer families are called; LXS, LXSR, LES, LESR, LKSR, LPSR. Each transducer can be mounted on printed circuit boards for non-intrusive and isolated measurements of DC, AC and pulsed nominal currents from 1.5A to 50A thanks to a multi-range configuration. These closed-loop current transducers are based on a LEM custom proprietary patented Hall Effect ASIC, allowing them to perform at the level of fluxgate transducers.

Published on 01/22/19 Read Article
Mitsubishi’s all new mechanism for Semiconductors

Mitsubishi Electric and the University of Tokyo Reveal New Mechanism for Enhancing Dependability of SiC Power Semiconductor Devices

Published on 01/16/19 Read Article
Darlington Transistors

The Darlington Transistor named after its inventor, Sidney Darlington is a special arrangement of two standard NPN or PNP bipolar junction transistors (BJT) joined together. The Emitter of one transistor is connected to the Base of the other to generate a more sensitive transistor with a much larger current gain being useful in applications where current amplification or switching is required.

Published on 01/11/19 Read Article
Darrah Electric is now on Octopart.com

Octopart.com is a search engine for electronic and industrial products headquartered in New York, NY. It aggregates parts from distributors and manufacturers online, making them easy to search for and purchase.

Published on 12/27/18 Read Article
Now stocking LEM's ITZ

Rack mounted (fix gain or programmable) current transducers. Made for ultra-high accuracy. 14 models. DC, AC pulse currents' measurements from 40 to 24000 ADC nominal with galvanic isolation. Outstanding linearity, from 1 to 10 ppm. Extraordinary resolution. Initial offset: < 2 ppm. Very low offset drift: from 0.1 to 0.6 ppm/K. Overall accuracy @ Ipn @ +25°C: between < +/- 3 ppm and < 12 ppm. Wide frequency bandwidth from DC up to 500 kHz (+/- 3 dB). Closed-Loop Fluxgate technology. Electrostatic shield between primary and secondary in the heads. Power supply 100-240 VAC, 50-60 Hz. Products made up of one measuring head in a side and one separated electronic in the other side connected together via a cable. Operating temperature range from +10 to +40°C for the electronics and from 0 to +55°C for the measuring heads. D-Sub 15 female connector used for the analogue output. D-Sub 9 male connector used for the status output. Really quick response time (from <1 µs to <2 µs). 600 A and 2000 A models are programmable in the needed range thanks to some programming plugs to add on the measuring heads. 5 measuring heads are available according to the current to measure and to the aperture needed for the primary conductor (from 25.4 mm up to 150.3 mm diameter).

Published on 12/26/18 Read Article