DEHN DASD II — Next Generation Solid‑State Pipeline Decoupler

For more than a century, DEHN has set the benchmark for protecting critical infrastructure worldwide.
DASD II advances that legacy with a next‑generation decoupler engineered for pipelines in high‑voltage influence environments.
With no mechanical wear, no maintenance, and the industry’s only built‑in test socket for fast field verification, it delivers stable, proven protection—ensuring safer crews, continuous CP, and long‑term operational reliability.

Special features:
  • Crew protection
  • Continuous CP
  • Field verifiable performance
DEHN

What makes DASD II Different

01
Pipeline‑Grade Safety

Purpose‑built to reduce hazardous touch voltages at test stations, valve sites, and isolation joints — providing crew protection even under fault or surge conditions.

02
High Performance in One Compact Device

Handles significant AC fault current and 100 kA lightning surges which is ideal for high‑risk or remote pipeline locations.

03
Maintenance‑Free, Solid-State Operation

No mechanical wear, no moving parts, and no power supply needed. DASD II delivers stable performance for decades with zero scheduled maintenance.

04
Integrated Test Socket

A built‑in test interface allows fast, safe verification in the field — eliminating downtime and improving inspection workflows.

05
Robust and Versatile

Engineered for harsh conditions, remote sites, and environments influenced by overvoltage events from nearby high‑voltage systems or lightning.

06
Flexible Configuration

Customizable DC blocking voltages and AC fault ratings provide design flexibility for pipeline, industrial, and utility installations.What makes DASD II Different

Technical features at a glance

APPLICABLE ANYWHERE

DASD is independent of an external power supply. The decoupler can therefore be used anywhere – even in places where, depending on the situation, there is a particularly high risk of interference voltages, potential changes or stray currents.

Designed for all common system configurations

The DASD II supports all standard pipeline and grounding configurations, including:

- Isolation joints
- CP continuity paths
- Multi‑point grounding
- Used alongside AC mitigation
- Remote assets without power

AC Steady state current (50/60Hz)45Arms (77Apeak)
DC Blocking voltage
(3 options, customizable)		-2V/+1V
-2V/+2V
-3V/+1V
AC Fault current (0.6 sec/30 cycles)
(5 options, customizable)		3.7kA
5kA
10kA
15kA
20kA
Nominal Surge (8/20µs) current In100kA
Lightning impulse (10/350µs) current Iimp100kA
Degree of ProtectionIP 65
DC leakage current<5mA @ 20oC
Operating Temperature-30oC to +85oC

DASD II vs. Traditional CP Decouplers

  • Pipeline‑specific safety design
    Not just grounding — DASD II is built for pipeline integrity and worker protection.
  • Integrated testability
    Field checks without removal; verifies functionality instantly.
  • Higher combined performance
    Lightning + fault current capacity in one unit.
  • Flexible selection
    Customizable DC blocking thresholds, unlike fixed-model decouplers.
  • Supports AC corrosion standards
    Aligns with pipeline safety and integrity requirements.
     

Engineered for Today’s Most Demanding Applications

Pipeline & CP Systems

AC interference environments
Touch voltage protection
Isolation joint DC continuity
Fault current and lightning discharge

Industrial & Utility Environments

Grounding separation
Lightning & surge current handling
Safe AC fault path for remote sites
 

Renewable & Energy Systems

Grounding for utility-scale solar
Energy storage (BESS) grounding
Infrastructure in high-voltage infuence areas

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Why DEHN? The DEHN Difference Global Protection Engineering — Trusted for Over 100 Years

DEHN has been a leader in surge protection, lightning protection, and grounding technology since 1910. Our solutions protect pipelines, substations, renewable energy systems, and industrial facilities in more than 70 countries — including the United States, where DEHN has supported critical infrastructure for decades.

Our engineering heritage, global experience, and commitment to reliability shape every product we build. The DASD II is the latest example of that legacy: a next‑generation solid-state decoupler designed for the future of American infrastructure.

100+ Years of DEHN Protection Engineering