FEATuRES - Alstom

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Type B Series Vital RelaysCoils and Name PlatesVital Relay CoilType B Relays may have one or two coils. A typical coil iswound on a phenolic spool which slips over the core of therelay. Relays with one coil may have one or two windingswhile relays with two coils may have up to three windings.Leads from the windings fasten to prongs which engage theplugboard. Slow-acting relays are made by placing copperwashers or copper/aluminum slugs on the cores. The morewashers, or the longer the slug, the slower acting the relay.All Type B Relays have a name plate displaying the catalognumber, drawing number, serial number and nominal coilresistance. The relay cover contains the tag holder for up toOrdering InformationType B Relays with Name Plates.two separate tags: a tag for relay operating and testing dataand a tag for circuit designation.For assistance in ordering or requesting further information on Type B Series Vital Relays, coils, contacts, name plates and otherparts please contact the <strong>Alstom</strong> Customer Service Center 1-800-717-4477.Vital Relays©2009 <strong>Alstom</strong> Signaling Inc. www.alstomsignalingsolutions.com 111
Type B1 and B2Biased-Neutral RelaysFeatures• Picks up only with properpolarity voltage• Fifty times normal voltagefor 2 seconds will notaffect relay operation• Will not pick up onreverse polarityType B1 BiasedNeutral RelayVital RelaysIntroduced in 1935, the Type B1 and B2 Relays are still theindustry standard. To date, over 2 million have been sold.Biased-Neutral Relays pick up only if a voltage of the properpolarity is applied to the coils - a characteristic provided by apermanent magnet and a leakage strip bridging the cores andplaced between the coils and armature. Fifty times normalrelay working voltage applied for 2-seconds at both normaland reverse polarity will not affect relay operating characteristicsmore than 2%, and will not pick up the armature onreverse polarity.112CALL 800.717.4477 • FAX 585.274.8777
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FEATuRES - Alstom

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