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Home | Measurement, Control and Field Automation | Pepperl+Fuchs | Process Automation | Surge Protection Solutions

Surge Protection Solutions

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Surge Protection Barriers provide protection for today’s sensitive electronic instrumentation – protection from the destructive effects of lighting and the transient surges that accompany this phenomenon. Surge Protection Barriers are used in a wide range of applications including measurement and control, instrumentation, power, and communication. The undesired consequences of surges include both equipment damage and equipment malfunction or lockup. Damage occurs when excessive surge voltage flashes over or punctures semiconductor junctions. Semiconductors are also sensitive to accumulated over-voltage stress. Successive surges chip away at the insulating layers in a process often referred to as “electronic rust”. When the equipment finally fails it is often not attributed to surges because the accumulative minor events actually caused the failure rather than a recent catastrophic event such as a localized lighting strike.

Operating Principle

The Sure Protection Barrier incorporates line-to-line (differential mode) and line-to-earth (common mode) protection. This is achieved by integrating suitable “switching” elements into the Surge Protection Barrier and guaranteeing proper connection to ground. Gas discharge tubes are used in the first switching stage of a Surge Protection Barrier. They are able to clamp high voltages and divert high currents, but their slow response time still allows dangerously high energy levels to pass through. Therefore, a second element must be implemented to control the remaining energy. This silicon avalanche Transient Voltage Suppressor (TVS) diode type responds to lower voltage and current levels extremely fast, clamps the voltages to non-damaging levels, and diverts the surge currents to ground. Both protection stages are decoupled with inductance elements.



For general enquires contact us at (+64) 9 634 1391 or by email at sales@customcontrols.co.nz

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