Dairyland Galvanic Isolators are fail-safe, solid-state DC isolation/ AC coupling devices that will prevent galvanic corrosion from occurring on your vessel. Our proven devices feature ratings and characteristics that significantly surpass all marine industry requirements ensuring long-life and lasting performance. Proven fail-safe construction assures that the galvanic isolator never compromises the integrity of the grounding conductor, even in the unlikely case of the product failing.

Please note: Effective February 2026, Dairyland has discontinued the sale of model GI-30A. Within this document, references to GI-30 remain to provide important product information and installation guidance for customers still utilizing this model.

The ISP is the original solid-state AC conducting/DC blocking device designed for the corrosion prevention industry and features the most flexible and wide range of product ratings and applications available to the market. The ISP provides the widest range of features and ratings, including the highest levels of AC fault-handling capability – up to the highest typical transmission system faults making it the preferred product for power utility underground cable decoupling/bonding requirements.

The ISP is the original solid-state AC conducting/DC blocking device designed for the corrosion prevention industry and features the most flexible and wide range of product ratings and applications available to the market. The ISP provides the widest range of features and ratings, including the highest levels of AC fault-handling capability – up to the highest typical transmission system faults making it the preferred product for power utility underground cable decoupling/bonding requirements.

The ISP is the original solid-state AC conducting/DC blocking device designed for the corrosion prevention industry and features the most flexible and wide range of product ratings and applications available to the market. The ISP provides the widest range of features and ratings, including the highest levels of AC fault-handling capability – up to the highest typical transmission system faults making it the preferred product for power utility underground cable decoupling/bonding requirements.

Personnel working near pipelines can be subject to electrical hazards such as lightning, AC fault current/voltage, and steady-state AC induction. Dairyland offers engineered Gradient Control Mats (GCM) to address lightning and AC fault current conditions effectively. Safety risks from step and touch potentials are now limited with our grid-type mat, in a much lower cost design. Dairyland also recommends decoupling gradient control mats to improve CP on the pipeline using the SSD.

Personnel working near pipelines can be subject to electrical hazards such as lightning, AC fault current/voltage, and steady-state AC induction. Dairyland offers engineered Gradient Control Mats (GCM) to address lightning and AC fault current conditions effectively. Safety risks from step and touch potentials are now limited with our grid-type mat, in a much lower cost design. Dairyland also recommends decoupling gradient control mats to improve CP on the pipeline using the SSD.

With the growing lineup of decoupling solutions offered by Dairyland following the introduction of the PCRX, customers may now be faced with the question of which decoupler will best suit their needs.  There are general guidelines that Dairyland provides related to site conditions to help make this choice.  These guidelines can be found here.  For those that want a definitive answer to this question, the CAD-270 is here to help.  The CAD-270 is a low-cost test device that can be temporarily installed at planned decoupler sites for the purpose of assessing the capacitive effects of a given installation.

The CAD-270 will react to instant off rectifier cycling in the same manner that a standard decoupler will.  By comparing instant off waveforms with and without the CAD-270 installed, the capacitive discharge effects can be analyzed to determine if PCRX or standard SSD/PCR decouplers are best suited for the application.

WARNING:  THE CAD-270 IS FOR TEMPORARY USE ONLY.  IT DOES NOT PROVIDE OVER-VOLTAGE PROTECTION.  IT IS NOT CERTIFIED FOR USE IN HAZARDOUS LOCATIONS.

Since 1983, Dairyland has offered the Neutral Isolator as the preferred solution for addressing “stray voltage” on farms. Power utilities who wish to isolate their primary neutral from the customer’s secondary neutral can prevent undesirable primary neutral-to-earth voltage (NEV) from affecting the customer system. Where utilities have concerns about NEV effects on dairy or other livestock operations, the Neutral Isolator offers the most effective and safe solution for separating the two systems under normal conditions, yet solidly re-bonding the two ground grids under lightning or AC fault conditions.

Note: The Dairyland model VTNI is not authorized for use in solving nuisance shock to persons at swimming pools or similar human health situations where structure to ground voltage is present.