Dairyland Polarization Devices

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Isolator / Surge Protector

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

Features and Characteristics

• Solid-state Design Replaces Polarization Cell Technology
• No Maintenance Needed
• Fail-safe Design
• Self-protection Features Built-in
• Simple Field Testing Procedures with Standard Equipment
• Comprehensive Testing Available with the optional In-situ Tester (IST)
• Flashing LED Indicates Device Operation
• No Energy/Power Requirements
• Unlimited Number of Operations
• Submersible Enclosure

Basic Ratings

Threshold Voltage
12.5 or 20V
Other voltages optional

AC Steady-State Current(Amperes – RMS) 60HZ
30, 60, 90 or 120A
* 120A rating available only with 118 fault current catalog code

AC Steady-State Current(Amperes – RMS) 50HZ
25, 50, 75 or 100A
* 100A rating available only with 118 fault current catalog code

Lightning Surge Current
75kA crest (8 x 20 µs waveform)
100kA (optional)

Environmental Rating
NEMA 4X or 6P

Hazardous (Classified) Areas
Not listed, but uses same general construction as our listed Division 2 (or Zone 2) products

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P.O. Box 476
So. Bound Brook, NJ 08880
Email: info@stuartsteel.com
Phone: 732-469-5544
Fax: 732-469-9270

Warehouse Address:
New Jersey
411 Elizabeth Ave.
Somerset, NJ 08873

Tennessee
1005 Main Street
Humboldt, TN 38343