High quality electrical power equipment

Product category: Circuit Protection Devices
News Release from: Smiths Interconnect - Transtector Systems | Subject: SXRR Series
Edited by the Electronicstalk Editorial Team on 14 April 2005

Protection is tailored
for railway signalling

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SXRR Series solid-state suppression devices are designed for railway signalling applications

Now available from Transtector Systems is the SXRR Series of solid-state suppression devices for railway signalling applications. SXRR Series devices operate extremely quickly, are rated for very high current levels and can be installed as line-to-line or line-to-earth devices. They provide continuous protection in the event that railway circuits become unbalanced, as a result of a surge strike.

Featuring a response time which is less than 5ns, the SXRR Series provides protection against surges of up to 20kA (8/20us).

Multiple silicon avalanche suppressor diodes (SASDs) are used in each device, suppressing induced voltages and shunting high currents away from the signalling circuits.

In the event of a catastrophic strike, the SXRR Series fails in open-circuit mode thanks to the presence of surge-rated fusing elements in series with the SASD circuit.

The device is prevented from entering a 'fail-short' condition whereby the failure occurs across the suppressor.

Should these elements fail, backup protection is still provided in the form of a gas discharge tube (GDT).

The SXRR has a breakdown voltage threshold of approximately 75V at 5mA and is tested to both the 8/20 and 10/100us waveforms.

The unit is equipped with a clear enclosure which darkens in the unlikely event of device failure.

It is intended for installation on the entrance board, as close as practicable to where the outside conductors enter the enclosure.

The SXRR suppressor weighs around 0.05kg and is mounted across 6mm-sized studs on 60mm centre-to-centre spacing.

Housed within a clear polycarbonate module rated to UL94V0, the unit operates over the temperature range -40 to +75C.

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