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Relays protect utility equipment

Posted: 11 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:lock-out relay? lor? electroswitch?

Accommodating virtually any lock-out switching application in the electric power industry, a new series of lock-out relays (LORs) from Electroswitch provide reliable protection of critical utility equipment. These new relays are available in a variety of models featuring manual-, electric- or self-reset capability. Standard nameplates include mechanical targets (black for normal operation, orange for trip), and some models are available with "smart nameplates" that incorporate up to three field-selectable target LEDs.

Manual-reset LORs, which are reset by the operator moving the handle back to normal, have nominal trip speeds of less than 8ms at rated voltage, as tested on 10-deck units. Electric-reset models can be reset either manually or through a command from supervisory control. Self-reset LORs will reset automatically once the trip has been cleared, either instantly or according to a factory-set time delay. Standard trip speeds for electric- and self-reset models range from 12ms to 15ms. However, these relays are also available in a high-speed, 8ms or less, configuration.

Replacing many General Electric models, Series 24 LORs provide up to 10 decks in a single relay and up to 40 independent contacts (2 normally-open and 2 normally-closed contacts per deck). Contacts are rated at 60A for 1 minute and 30A for continuous current in a range of 125Vdc to 250Vdc or 120Vac to 600Vac. These models comply with UL, CSA, and Nuclear Class 1E safety standards and are available with built-in coil monitoring and fault signal detection/indication.

Type WL and Type WL-2 LORs were originally designed and manufactured by Westinghouse. Electroswitch acquired these product lines and now exclusively offers these relays. They are available with or without handle-trip capability.

Prices start at $300. Delivery is two weeks.

- Gina Roos


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