How to Select Terminal Blocks       Image credit: Newark/element14 | Quist Electronics | Weldmuller   Terminal blocks are modular, insulated blocks that secure two or more wires together.   Understanding Terminal Blocks Terminal blocks are used to secure and/or terminate wires and, in their simplest form, consist of several individual terminals arranged in a long strip. Terminals are useful for connecting wiring to a ground or, in the case of...
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Q & A on Terminal Blocks

We asked our users for their input on Terminal Blocks. Here are the results of 119 users familiar with Terminal Blocks.

Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice |

Who Took Our Poll?Top

Design TrendsTop

Q:
What new technologies are influencing terminal block design?
17 answers
Answers:
In the instrumentation field, Electronic marshalling is getting more attention as it reduces the larger effort on the engineering, wiring scheduling and factory build work. Compact TB's with electronic circuit which then get connected (VIA the rail) to a central CPU/Controller to electronically marshal the signal terminated to the DCS/PLC IO's using Rippon cables will bring down the engineering time and build effort tremendously.
~Engineering, Design, Chennai, India
In lighting : breakthrough of LED - smaller sections
~Ed B, Design Engineer, Antwerp, Belgium
Depend of application of IEC Standard 947-7-1
~Jozef M, General Management, Maribor, Slovenia
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Q:
From your perspective, which companies are creating the most innovative terminal blocks?
17 answers
Answers:
Honestly I feel every company puts their due effort on innovation.
~Engineering, Design, Chennai, India
Weidmuller, Rockwell Automation, Wiedland, Allen-Bradley
~Fred D, Design Engineer, Pictou, Canada
I can not determine the best company.
~Isay G, Reliability Lab supervisor, Bber Sheva, Israel
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Applications and UseTop

Q:
What are some of the applications you have used terminal blocks for?
32 answers
Answers:
Use in industrial electrical control panels for 24vdc, 120vac control circuits also in 480vac and 600vac motor circuits.
~Quality Control, KITCHENER, Canada
Domestic, Commercial, and Military Aircraft installation repair and maintenance. Modifications carried out as necessary.
~Dave G, Engineer, Falmouth Cornwall, UK
Instrumentation Marshalling cabinets (IS and NON IS), Junction box, Power terminal block for power distribution
~Engineering, Design, Chennai, India
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Q:
Please share with us any “non-standard” applications that terminal blocks have been used for.
6 answers
Answers:
Non-standard application- Support a desk at the bottom of its leg If its shaking.
~Engineering, Design, Chennai, India
Netec Industries specializes in custom requirements, low or high volume.
~Marketing/Sales, Aspen, CO
I have not used terminal blocks in a non-standard application.
~Isay G, Reliability Lab supervisor, Bber Sheva, Israel

Q:
Do you know of any disastrous mistakes that occurred due to the incorrect usage of terminal blocks?
9 answers
Answers:
A production line was brought to a stand still due to the back blowing out of a terminal, causing it to short to the terminal next to it, bringing down the 24VDC supply on the system.
~Electrical Engineer, Engineer, Geelong, Australia
Usage of terminals at low current without additional load may lead to incorrect passing of V/I
~Isay G, Reliability Lab supervisor, Bber Sheva, Israel
- Conductors coming loose because of wrong strip lengths or wrong conductor preparation
~Ed B, Design Engineer, Antwerp, Belgium
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FeaturesTop

Q:
What would your design or feature "wish list" be for this product?
14 answers
Answers:
In instrumentation field, I wish to have: Electronic marshalling Wire-less marshalling Terminal blocks for easy shield wire termination options Busbar Terminal block with insulated fan-out and Fan-in options for various different cable size.
~Engineering, Design, Chennai, India
A small Chamfer at the entry point of the block to aid insertion of the conductor and to prevent small stranded conductors from being pushed back out of the connection.
~Dave G, Engineer, Falmouth Cornwall, UK
Ease of connection. There is nothing worse than being in a tight spot, and thinking you have a wire in the terminal. Tighten it up, then find out that you missed.
~Electrical Engineer, Engineer, Geelong, Australia
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Buying AdviceTop

Q:
Do you have any advice for people relative to buying or using terminal blocks?
13 answers
Answers:
Quality of the actual terminal compression either screw or auto connection. And of course the circuit conditions in use.
~Dave G, Engineer, Falmouth Cornwall, UK
Check security of end plates and or end stops. Recommended torque if using screw type connectors.
~Geoff H, Builder/Contractor, Warkworth, New Zealand
Make sure they are using them properly and have the correct certifications.
~Quality Control, KITCHENER, Canada
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Q:
Is there any advice you want to share with users to help them avoid common errors in selection or usage of terminal blocks?
11 answers
Answers:
Use the appropriate terminals depending on the current requirement. Use of bigger terminals where the current is less increases the total cost of the product.
~Amarpal Singh Oberoi O, Research & Development, PUNE, INDIA
Ensure the purchase made is correct for all circuit conditions in use. When connecting terminations use the manufacturer's recommended torque settings.
~Dave G, Engineer, Falmouth Cornwall, UK
Use the proper size screw driver to avoid breaking the terminals and proper tightening torque.
~Fred D, Design Engineer, Pictou, Canada
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