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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...


Never has the shunting of circuits for CT testing been faster, safer or easier. With fully captive hardware there is never a problem with lost grounding screws. With the isolated ground buss the process was never safer. The visible position indication when the screw is engaged shows the circuit that is shunted, allowing for quick and easy CT test measurements.

All of the "iQ Technology" of Concentric Devices is utilized to improve the ability to address CT testing. Importantly, the interchangeability of a 30CT terminal block with a 30TB block makes the panel design easier. The durable, laser etched circuit identification and fixed hardware make the testing more efficient and safer than ever.

Increased productivity and improved functionality are the goals of Concentric Devices.

Specifications for the 30CT Series Terminal Block
30TB Series schematic
Schematics for the 30CT Series Terminal Block
30TB Series schematic