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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...


Concentric Devices encourages the use of DIN rail for mounting our family of terminal blocks into the control panel. This approach provides the fastest way to get through the panel layout function and into production.

DIN rail mounting allows you to place terminal blocks into the panel, then later change the position or function of the blocks within seconds. The foot print of our TB, CT and iL series blocks are identical with the DIN rail mounting adapters. You can replace a 12 position TB with a 6 position CT and a 6 position iL within seconds. This is all part of our "iQ Technology".

Since there is no use of additional "real estate" to screw the blocks into the panel, you have the greatest density of circuits possible.

Specifications for din rail mounting
30TB Series schematic