These breakers come in two versions — one with magnetic trip element for short-circuit protection and the other with thermal and magnetic trip elements for overload and short-circuit protection. They can be used by themselves as manual motor controllers, and they also work well with Series 300 contactors in group motor installations. An ON/OFF manual operator makes it easy to isolate motor circuits without disconnecting all of a control panel's circuits. They have visual trip indicators for easy spotting of tripped circuits, and a test function for verifying device performance and proper control circuit operation. They have a modular design and come with accessories such as auxiliary contacts, shunt and undervoltage release modules, and wiring accessories. They come in universal ratings and markings: A, kW and HP ratings, plus applicable third-party certification markings.
In this new Design News feature, "How it Works," we’re starting off by examining the inner workings of the electronic cigarette. While e-cigarettes seemed like a gimmick just two or three years ago, they’re catching fire -- so to speak. Sales topped $1 billion last year and are set to hit $10 billion by 2017. Cigarette companies are fighting back by buying up e-cigarette manufacturers.
Microchip recently released the 3D TouchPad, the first USB PC Peripheral device that couples 2D multi-touch input with 3D air gesture technology. The company seeks the help of developers to further enhance the capabilities of the technology.
To give engineers a better idea of the range of resins and polymers available as alternatives to other materials, this Technology Roundup presents several articles on engineering plastics that can do the job.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.