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VOLUME -24 NUMBER 12
Publication Date: 12/1/2009
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Special Features: Test and Measurement
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December 2009 Issue
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Electroswitch: Time Delay Control Switch
Time-delay control switch.
Weymouth, MA — A new time delay control switch relay (TD-CSR) has been introduced by Electroswitch. The new TD-CSR provides a safe and effective means for local control to mitigate the arc flash danger in circuit breaker operation. It provides for a manually initiated time-delay trip or close operation that incorporates a flashing LED to notify the operator of a pending trip or close operation and to evacuate the "Arc Flash" area. SCADA operation is not required.
Local trip or close capability is initiated and delayed for 10 seconds with an option to easily cancel the pending trip or close operation. To avoid any chance of an inadvertent operation, the control pushbuttons have a time-delay feature requirement — they be depressed for 4 continuous seconds to activate the 10-second delay, and other time delay options are also available. The unit's intuitive pushbutton design simplifies personnel training and no special wiring is required for installation.
The TD-CSR is available with the same reliable features and options as the company's field-proven control switch relay, which includes a standard mechanical target ("flag") to show the last operating position and a lighted nameplate option. The nameplate includes local LED indication, a remote SCADA contact alarm, and a single or dual trip-coil monitoring option.
Reliable, self-cleaning, double-wiping contacts with silver or silver alloy surfaces provide very low contact resistance for low-level control applications. Terminals are rugged standard screw-type terminals that allow for handling a 30A/600V continuous current rating. The TD-CSR meets all the same IEEE C37.90 series standards for the company's relay products, confirmed by established periodic in-house testing.
Contact: Electroswitch, 180 King Ave. Weymouth, MA 02188,
781-335-5200, fax: 781-335-4253, E-mail: email@example.com, Web:
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