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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...


With the increasing complexity and density within today's control panels, the need for durable and highly readable circuit identification is critical. This applies to the production phase, as well as the operation and maintenance phases.

Options for ID marking today are limited. Concentric Devices solves that problem with either standard or customized ID strips. Circuit identification is important not only on standard terminal blocks, but also on CT and iL (interruptable link) terminal blocks.

All of the ID strips provided by Concentric Devices become integral to the terminal blocks. On the CT and iL versions, we continue with the color coding to make the identification of the terminal block and its function as quick as possible.

Customized ID strips are possible with the wiring legend from your files. Standard ID strips are laser etched from given numbers, such as 1-12 , 1-6 or 1-4.

Laser ID's are available on all series
30TB Series schematic