DUPONT RYNITE PET SWITCH REDESIGN SAVES SPACE, CUTS PRODUCTION COSTS

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DUPONT RYNITE PET SWITCH REDESIGN SAVES SPACE, CUTS PRODUCTION COSTS
24 June 2007 - DuPont Engineering Polymers

Cooper Bussmann is delivering benefits to its customers and reducing manufacturing costs with the redesign of its Telpower fused disconnect switches to use DuPont Rynite PET thermoplastic polyester.

The Telpower TPHCS switch, installed in power distribution cabinets for telecommunications equipment, is a patent-pending design that replaces an earlier unit made with thermoset phenolic. It consists of a panel-mountable base and a pull-out fuse carrier. Withdrawing the fuse carrier from the base disconnects load current.

“Rynite helps us meet high performance goals while reducing switch size to save space in high-density, high-power distribution cabinets,” said Jaime Torrez, senior design engineer at Cooper Bussmann. “What’s more, the redesigned switch cuts manufacturing costs by more than half.”

The properties of Rynite allowed Cooper Bussman to use thinner walls than phenolic parts, and this was a key factor in reducing part size. The footprint of the Telpower TPHCS measures 5.50 by 2.62 inches (140 by 66 mm), about 47 percent smaller than the earlier phenolic unit.

Design freedom provided by Rynite allowed the integration of snap-in assembly features for the handle and fuse contacts. These and other functional features reduce assembly costs and part count. Additional cost savings are achieved with faster molding cycles than phenolic parts and by recycling sprues and runners.

Cooper Bussmann’s TPHCS switch meets demanding service requirements. It is rated for service at 70 to 800 A and 80 V, DC. It is UL-recognized (UL 1801) and meets similar Canadian standards.

The material selected by Cooper Bussmann is DuPont Rynite FR530L, a 30 percent glass-reinforced grade. It meets this application's requirements for good strength and toughness, a high RTI (relative temperature index) 155°C per UL 746B, and a V-0 flammability classification per UL94 and IEC 60695-11-10.

DuPont is a science-based products and services company. Founded in 1802, DuPont puts science to work by creating sustainable solutions essential to a better, safer, healthier life for people everywhere. Operating in more than 70 countries, DuPont offers a wide range of innovative products and services for markets including agriculture and food; building and construction; communications; and transportation.

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About: DuPont Engineering Polymers
The DuPont Engineering Polymers business manufactures and sells DuPont Crastin PBT and DuPont Rynite PET thermoplastic polyester resins, DuPont Delrin acetal resins, DuPont Hytrel thermoplastic polyester elastomers, DuPont ETPV engineering thermoplastic vulcanizates, DuPont Minlon mineral reinforced nylon resins, DuPont Thermx PCT polycyclohexylene dimethyl terephthalate, DuPont Tynex filaments, DuPont Vespel parts and shapes, DuPont Zenite LCP liquid crystal polymers and DuPont Zytel nylon resins.

These products serve global markets in the aerospace, appliance, automotive, consumer, electrical, electronic, industrial, sporting goods and many other diversified industries.

Founded in 1802 science company DuPont operates in more than 70 countries. It offers a wide range of products and services for markets including agriculture, nutrition, electronics, communications, safety and protection, home and construction, transportation and apparel.

DuPont Electronic & Communication Technologies is a leading supplier of electronic materials, fluoropolymers, fluorochemicals and imaging technologies.

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