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Spotlight on Circuit Protection - Power Electronics

Spotlight on Circuit Protection - Power Electronics

Spotlight on Circuit Protection - Power

ong>Spotlightong> on Circuit Protection Surge-Protection Device Modules Raycap’s Strikesorb 40-mm and 80-mm surge-protection device (SPD) modules are now certified by Underwriters Laboratories (UL) for meeting the UL 1449 3rd Edition Safety Standard. Featuring a flat-slope resistance characteristic, the Strikesorb SPD modules received a nominal discharge current test rating of 20 kA, the highest possible, without the use of internal fuses. The Strikesorb SPD modules have been designated as Type-4 devices deemed suitable by UL for use in Type-2 applications. The 40-mm Strikesorb module is rated at 140 kA, and the 80-mm Strikesorb module is rated at 200 kA. The modules have an operating voltage range of 120 V to 600 V. The Strikesorb module is comprised of a single distributiongrade metal oxide varistor (MOV) disc that provides uniform distribution of the surge current over the total area of the MOV protection element. The Strikesorb’s monolithic design provides ® a straight electrical path to its large single disc of distribution-grade varistor material, unlike other SPD systems that employ arrays of commercial-grade MOV components with 90-degree-angled lead wires to each varistor. The absence of lead wires and internal disconnect mechanisms give the Strikesorb extremely low let-through voltage. The Strikesorb module also can be directly connected on the power bus bars inside the cabinet of the equipment after the main circuit breaker. Raycap Liberty Lake, Wash. www.raycapinc.com CHECK OUR INVENTORY AT: www.fusesunlimited.com CALL: (800) 255-1919 The Circuit Protection Specialist ISO 9001:2000 Registered ESD TVS Diodes OnChip Devices’ ESD2200 is a family of miniature transient voltage suppressor (TVS) diodes with very high protection levels from electrostatic discharge (ESD). The ESD2200 safely dissipates ESD strikes of ±30-kV contact discharge. It is offered in two, three, four and five channels and has superior electrical performance. The input capacitance of the ESD2200 is under 20 pF. This diode capacitance also provides some EMI filtering when used in combination with a pc-board trace or series resistor. Packaged in miniature SOT23, SOT143 and SC70 (SMD), the OnChip ESD2200 is available immediately. Pricing ranges from $0.06 each to $0.15 each. OnChip Devices Santa Clara, Calif. www.onchip.com SMD Fuse Schurter has added several current ratings to its UMT 250 series, for a total of 22 ratings from 80 mA to 10 A. The series is designed to provide overcurrent and short-circuit protection in both primary and secondary circuits. The UMT 250 can be mounted on both sides of the pc board. Its low profile increases production rates when mounted with pick-and-place assembly machines. An ideal substitute for axial and radial leaded through-hole fuses where bending leads can cause assembly delays, the UMT 250 is packaged in plastic bags of 100 pieces or in 2000-piece taped reels for automated assembly. Pricing starts at $0.60 each in quantities of 100. Schurter Santa Rosa, Calif. www.schurterinc.com/new_fuses Fuse Selective Coordination Panel The Ferraz Shawmut Fused Selective Coordination Panel is a UL 67-listed panel board that uses class CC ultrasafe fuse holders with easy-to-see blownfuse indicators. The compact size and removable backpan allow for easier installation. Features of the panel include a bonded ground bar and a neutral bar with set-screw terminations. Main-lugs-only terminations include an optional molded case switch. Branch circuit breakers provide circuit isolation, and the panel Power Electronics Technology August 2008 42 www.powerelectronics.com

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