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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...


The combination of "iQ Technology" and innovative design results in the next generation electrical terminal block for high reliability applications.

Concentric Devices introduces the 30TB series to solve the existing problems found with using traditional terminal blocks. Panel design time and design flexibility are greatly improved through use of the DIN rail mounting adapters. Cable termination time is cut by 60% by the captive hardware and dead front design. Delays due to lost hardware are a thing of the past. Circuit identification is permanently and significantly enhanced by laser etched ID strips.

Control panel design, manufacturing, installation and operation are improved by the new approach from Concentric Devices. The result is increased productivity, safety and reliability. Simply better!

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