Innovative 15 kV vacuum relay

March 2008 Operator Interfaces, Switches & Relays

When power switching a load using a vacuum relay, even hard contacts vaporise, and the material becomes deposited and plate-out the internal walls of the ceramic envelope. Over time, these deposits reduce the isolation voltage, which causes the relay's end of useful life. GIGAVAC has solved the plate-out condition by adding an internal shield to the G18 relay. The deposits hit the shield rather than the ceramic wall, resulting in a relay life many times longer than relays without the shield.

GIGAVAC's new G18 also has tungsten contacts, and it can easily switch 10 kV at 2 A for 100 000 cycles, 330 V d.c. at 17 A for 10 000 cycles, or switch other currents at voltages up to 15 kV. The G18 is the same size as the G8 vacuum relays used for RF applications and lower current switching, as well as the G15 SF6 gas filled relay for high in-rush current applications. The G18 is available with coil voltages of 12 V d.c., 26,5 V d.c., and 115 V d.c., or customised. An exchangeable coil feature allows users to change the coil after installation. Latching and RoHs compliant versions are also available.

For more information contact Mervyn Stocks, Denver Technical Products, +27 (0)11 626 2023, [email protected], www.denvertech.co.za

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