iQ means "Interoperability Quotient", and is our proprietary, patented technology which allows the use of identical components on all of the Concentric Devices' product lines. This allows all our products to act effectively and efficiently together. Learn more...

Just some of the benefits to terminal block design and implementation through iQ Technology are captive hardware, faster termination, greater design flexibility, increased safety, laser strip ID, and higher circuit density. Read more...


Concentric Devices terminal blocks are manufactured in the United States to the most demanding specifications. See the entire physical specifications list.

iQ technology produces the terminal block with the fastest installation and termination, safest operation and best circuit identification available. View the product.

Fully captive hardware and isolated electrical paths provide the safest and fastest way to shunt circuits for CT testing. A simple turn of a screw does it. No lost hardware, ever. View the product.

Interruptible Link provides circuit opening with captive hardware and isolated electrical paths. No loose hardware or potential contact with live buss bars. A simple turn of a screw does it. View the product.

For maximum design flexibility and circuit density, use din rail mounting.

For those customers who want to stick with traditional panel mounting, our panel-mount hardware fits all major patterns for screwmounting, making switching to our terminal blocks simple. Read more...

Never loose track of circuits again. Customize, laser etched ID strips identify your specific circuit. Find out more...

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Cross-section of a Concentric Devices terminal block.

Concentric Devices is the manufacturer of the next generation of value-added electrical terminal blocks. We utilize our "iQ Technology" to provide a completely integrated connectivity solution for electrical control applications. Concentric Devices provides distribution terminal blocks, CT shunting or grounding terminal blocks and circuit interrupting terminal blocks. Each has a specific function, and yet is fully integrated with the others.

This interoperability quotient is the"iQ" in our "iQ Technology". This technology provides totally captive hardware, dead front and finger safe isolation, maximum design flexibility, highest circuit density, fastest termination, positive circuit identification, easiest installation and quickest circuit testing after installation. The combination of these features provides the user with dramatic increases in productivity, safety and reliability.

Optimizing the functionality of our terminal block products is the goal of Concentric Devices. The totally integrated solution offers the ability to address the range of functions that high reliability users require. We will continually offer new value-added products to provide the users with the finest technology to improve their own products.