Solid State Decoupler (SSD)

Innovative Solid-State technology that controls and preserves Cathodic Protection currents, limits and mitigates overvoltages or stray currents.

Features:
  • Smaller and more economical than Polarization Cell Replacement technology
  • Wide range of options to suit specifications and design requirements
  • Sharp Turn on Feature
  • Solid State Technology
  • Short Circuit to Ground – “effective ground fault path”
  • Limited application
  • Easy installation and optional accessories

*Please use the Filter option below to narrow specifications, or browse the table list of standard SSD decoupler units we offer.

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Description

The Solid State Decoupler (SSD) functions as a DC voltage level clamping device in buried pipeline and storage tank systems.

It can, at the same time, mitigate AC voltage. This feature allows up to 15A AC induced current to pass and prevents the flow of DC current while the DC voltage remains below the predetermined design blocking threshold. When the DC voltage exceeds the threshold, the device instantly switches on forming a near short circuit across the circuit and limits the DC voltage of the device under Cathodic Protection. Immediately, the voltage falls as the surge event passes and decays to below the threshold level, the SSD switches off and reverts to its blocking mode (“Off State”).

These types of devices do not fully comply with NFP 70 guidelines when they are in conduction mode. Both cathodic protection applied DC and Induced AC present on the operating circuit (Insulated / coated Structure) is short-circuited (to Ground). Once “on”, current flowing through the device can maintain these devices in the conducting state even when the voltage fault threshold has fallen below the level set. Their application can result in surging of cathodic protection power supplies.

Typical current discharge limits are 1,2kA, 2kA, 3,7kA, and 5kA. Greater discharge limits are available but are by special request.

Solid State Decoupler (SSD) devices are typically factory set to standard thresholds ranging from +2V to –2V through –20V.

*Please use the Filter option to narrow specifications, or browse the table list of standard SSD decoupler units we offer.


Specifications:

  • Available with AC fault current rating 1.2 kA ; 3,7kA ; 5kA for 30 Cycles
  • Wide DC clamping voltage range +2V, -2V, -5.6 V, -9.2 V , -12.8 V, -16.4 V, -20 V
  • High steady state DC current drain
  • 60 Hz AC impedance of 0.04 Ω (Extra)
  • AC steady state current 45 A @ 50/60 Hz (Extra)
  • Lightning impulse current rating Class 1: 100 kA for 10/350 µs
  • Lightning DC spark over voltage -600 V
  • IP68 Submersible design up to two meters in depth
  • Exe (Hazardous Areas 1 and 2)

To order, please request a quote using the add to quote button above or get in touch with us directly using our contact form or giving us a call. 

Option AC Fault Amp DC Threshold Voltage
SSDth 1.2kA, +2,-2V
1.2kA 45 +2,-2V
SSDth 1.2kA, +2,-5.6V
1.2kA 45 +2,-5.6V
SSDth 1.2kA, +2,-9.2V
1.2kA 45 +2,-9.2V
SSDth 1.2kA, +2,-12.8V
1.2kA 45 +2,-12.8V
SSDth 1.2kA, +2,-16.4V
1.2kA 45 +2,-16.4V
SSDth 1.2kA, +2,-20V
1.2kA 45 +2,-20V
SSDth 2kA, +2,-2V
2kA 45 +2,-2V
SSDth 2kA, +2,-5.6V
2kA 45 +2,-5.6V
SSDth 2kA, +2,-9.2V
2kA 45 +2,-9.2V
SSDth 2kA, +2,-12.8V
2kA 45 +2,-12.8V
SSDth 2kA, +2,-16.4V
2kA 45 +2,-16.4V
SSDth 2kA, +2,-20V
2kA 45 +2,-20V
SSDth 3.7kA, +2,-2V
3.7kA 45 +2,-2V
SSDth 3.7kA, +2,-5.6V
3.7kA 45 +2,-5.6V
SSDth 3.7kA, +2,-9.2V
3.7kA 45 +2,-9.2V
SSDth 3.7kA, +2,-12.8V
3.7kA 45 +2,-12.8V
SSDth 3.7kA, +2,-16.4V
3.7kA 45 +2,-16.4V
SSDth 3.7kA, +2,-20V
3.7kA 45 +2,-20V
SSDth 5kA, +2,-2V
5kA 45 +2,-2V
SSDth 5kA, +2,-5.6V
5kA 45 +2,-5.6V
SSDth 5kA, +2,-9.2V
5kA 45 +2,-9.2V
SSDth 5kA, +2,-12.8V
5kA 45 +2,-12.8V
SSDth 5kA, +2,-16.4V
5kA 45 +2,-16.4V
SSDth 5kA, +2,-20V
5kA 45 +2,-20V

 

Larger 9ka & 14kA options also available by request

Additional information

AC Fault Options

1.2kA @ 500 mSec. (30 Cycles), 2kA @ 500 mSec. (30 Cycles), 3.7kA @ 500 mSec. (30 Cycles), 5kA @ 500 mSec. (30 Cycles), 9kA @ 500 mSec. (30 Cycles), 14kA @ 500 mSec. (30 Cycles)

DC Threshold Options (SSD)

+2/-2, +2/-5.6, +2/-9.2, +2/-12.8, +2/16.4, +2/-20V

Isolation Switch Required

No, Yes

Enclosure Options

Standard IP 68 Exe, Other