Electronic Decoupling Devices

An Electronic Decoupling Device (EDD) designed as a polarisation cell replacement (PCR). The EDD is a solid state device which prevents the flow of Direct Current (DC) volts while simultaneously providing a grounding (coupling) path for steady state Alternating Current (AC).

An Electronic Decoupling Device (EDD) has been designed as a polarisation cell replacement (PCR). The EDD is a solid state device used in the cathodicprotection industry which prevents the flow of Direct Current (DC) volts across the terminals between +2/-2V (symmetrical) or +1/-3V (asymmetrical) DC, while simultaneously providing a grounding (coupling) path for steady state alternating current (AC), should AC be present.

The device can be configured for symmetrical or asymmetrical by moving a linking bar (factory set to asymmetrical). The product has the added features of being rated to carry lightning and AC fault currents.

It has been designed to be an ideal replacement for electrochemical polarisation cells as the solid state design eliminates the need for maintenance with potentially hazardous chemicals.

Common Applications
- DC Isolation of Cathodically Protected structures from power utility grounding systems.
- Blocking Stray DC Voltages.
- Over Voltage protection of equipment form AC faults, lightning and switching transients.
- Over voltage protection of insulating joints.
- Mitigation of AC induced voltages on structures.
- AC Fault Current Rating
- There are four different current sizes available at 50Hz and 60Hz with the following replacements.