Surge protection block

October 2008 Electrical Power & Protection

DEHNrapid from DEHN is a combined lightning current and surge arrester that is directly pluggable into disconnection blocks based on the standard LSA insulation displacement connection system, allowing easy integration within enclosures. The integrated LSA disconnection function in the unit's 10-pair plug-in protection block allow for protected testing, disconnecting or patching within the system or the additional attachment of single-pair surge arresters.

The 10-pair plug-in surge-protection block incorporates gas discharge tubes and optional visual fault indications as well as the disconnection block contacts. The surge arresters snap into the earthing frame and can be removed as a block, whenever required.

A fail-safe function short-circuits the lines to earth in order to protect the gas discharge tube from a possible burn-off due to over-currents. In the event of an over-current, the disconnecting solder between the spring and the surge-protection device melts, the leads are short-circuited and the temperature-sensitive colour on the spring changes from light pink to dark purple and requests the user to replace the surge protection device.

A measuring or disconnection adaptor can be plugged into the device in the same way as a disconnection block to ensure protection during maintenance.

For more information contact Paul van As, Surgetek, +27 (0)11 792 1303, info@surgetek.co.za, www.surgetek.co.za

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