Packaging & Interconnects: Screw-Termination Blocks Augment General-Purpose Relay Designs

Sept. 20, 2004

Relay designs looking for a shot in the arm may want to consider the two-pole 30-A T92 power relays. Flange-mount screw terminal, pc-board, and flange-mount quick-termination versions are available. M4 screws with capacitive pressure plates are provided for coil and load connections. Contacts are rated for 30-A resistive loads at 120/277 V ac or 20 A at 28 V dc. Ratings include 1 HP at 120 V ac, 3 HP at 240 V ac, and 1.5 HP at 480 or 600 V ac. Breakdown between contacts and coil is 4000 V rms 50/60 Hz; 1500 V rms 50/60 Hz between open contacts; and 2000 V rms 50/60 Hz between poles. A screw terminal T92 with a 24-V dc coil costs $3.64 in 10,000-unit lots. Lead time is 10 to 12 weeks.

Tyco Electronicswww.tycoelectronics.com(800) 522-6752

About the Author

Roger Allan

Roger Allan is an electronics journalism veteran, and served as Electronic Design's Executive Editor for 15 of those years. He has covered just about every technology beat from semiconductors, components, packaging and power devices, to communications, test and measurement, automotive electronics, robotics, medical electronics, military electronics, robotics, and industrial electronics. His specialties include MEMS and nanoelectronics technologies. He is a contributor to the McGraw Hill Annual Encyclopedia of Science and Technology. He is also a Life Senior Member of the IEEE and holds a BSEE from New York University's School of Engineering and Science. Roger has worked for major electronics magazines besides Electronic Design, including the IEEE Spectrum, Electronics, EDN, Electronic Products, and the British New Scientist. He also has working experience in the electronics industry as a design engineer in filters, power supplies and control systems.

After his retirement from Electronic Design Magazine, He has been extensively contributing articles for Penton’s Electronic Design, Power Electronics Technology, Energy Efficiency and Technology (EE&T) and Microwaves RF Magazine, covering all of the aforementioned electronics segments as well as energy efficiency, harvesting and related technologies. He has also contributed articles to other electronics technology magazines worldwide.

He is a “jack of all trades and a master in leading-edge technologies” like MEMS, nanolectronics, autonomous vehicles, artificial intelligence, military electronics, biometrics, implantable medical devices, and energy harvesting and related technologies.