
Product Spotlight: Marathon 1500 Series Heavy Duty Terminal Blocks
Marathon Special Products’ line of 1500 series heavy duty terminal blocks offer reliable electrical terminations for harsh environments. In fact, these heavy duty terminal blocks are UL listed and CSA certified.

Manufacturer Profile: Marathon Special Products
Marathon Special Products is a premier manufacturer of fuse holders, terminal blocks, and power blocks. Based in Bowling Green, Ohio , Marathon’s headquarters houses an extensive electrical test lab in addition to manufacturing and warehousing facilities. Marathon Special Products is a subsidiary of Regal Beloit and the owner of the Kulka brand of terminal blocks.
Since 1955, Marathon has been developing innovative solutions including streamlined molding, stamping, and assembly. In addition to innovative design and manufacturing Marathon has also gained a reputation for quality. In fact, many of Marathon’s terminal and power blocks are NEMA and UL rated. Marathon offers a broad range of terminal blocks, fuse holders, and power blocks with various styles, electrical ratings, and sizes to meet diverse application requirements.
Marathon electrical distribution products include:
Marathon Fuse Holder Styles
- Photovoltaic Fuse Holders
- T Class Fuse Holders
- CC Class Fuse Holders
Marathon/Kulka Terminal Block Styles
- Double Row Barrier Terminal Blocks
- Feed Thru Stud Terminal Blocks
- Military Class A-A-59125 Terminal Blocks
Marathon Power Block Styles
- NEMA Power Blocks
- High Voltage (HVPB) Power Blocks
- Enclosed Power Blocks (EPB)
bisco – Authorized Marathon Distributor
bisco industries is your local authorized supplier for Marathon products and Kulka brand terminal blocks. bisco stocks a wide variety of Marathon terminal blocks and accessories including the military class 37TB, 38TB, and 39TB series terminal blocks. For technical specifications view the complete Marathon Catalog. For quotes and orders simply visit biscoind.com and search the Marathon part number.

Manufacturer Profile: Altech Corp
New Jersey based Altech Corp has a long history of manufacturing industrial control products, power distribution components, and much more. In fact, Altech offers nearly all the common products found in enclosures in addition to enclosures themselves. Altech prides itself on quality and is an ISO 9001 certified company with many products that meet UL and international standards. While Altech products meet top tier quality standards, they are also competitively priced and readily available.
Altech Corp Products Include:
- Terminal Blocks
- Ferrules
- Circuit Breakers
- Switches
- Timers
- Sensors
- Relays
- Enclosures
For a complete listing of Altech products view Altech’s digital catalogs.
bisco – Authorized Altech Distributor
bisco industries is proud to be an authorized Altech distributor. We have recently updated our Altech landing pages to include product data on hundreds of Altech items. Looking for pricing and stock information? Visit biscoind.com and simply search the Altech item. If pricing is not readily available our e-commerce customer service team will be happy to assist you.

What is a Terminal Block?
Terminal blocks function as convenient connection points for electrical wires while avoiding the need for wires to be spliced together. At the most basic level a terminal block is a strip of molded plastic fitted with metal plates and screws. Each connection point (terminal) features a metal plate and two parallel screws which conduct electricity and secure the wires in place. Connections are formed when the wires (typically outfitted with terminal lugs) are clamped between the screws and the conductor plate. Terminal blocks are also available in more complex configurations which provide features like spring clamp terminals and din rail mounting. Related products include euroblocks (European style terminal blocks) and power blocks.
Common Terminal Block Configurations
- Din Rail Mounted Terminal Blocks
- Double Row Terminal Blocks
- Single Row Terminal Blocks
- Feed Thru Stud Terminal Blocks
- Barrier Terminal Blocks
Leading Terminal Block Manufacturers
- Marathon Special Products (Kulka)
- Molex
- TE Connectivity
- Altech
- ABB
- WAGO
For more information about terminal blocks check out resources from manufacturers like ABB and Marathon. Have a question? Contact bisco’s customer support team anytime.
Molex: One Company – A World of Innovation
Molex is a global manufacturer of electronic components providing innovative solutions to end users in the consumer electronics, military/aerospace, telecommunications, and industrial automation industries. Molex boasts 45 manufacturing facilities around the world with capabilities to produce everything from miniature connectors to large cable assemblies. Molex offers a wide variety of standard electronic components as well as the ability to manufacturer custom solutions to meet the most challenging applications.
Molex Catalog Products Include:
- Board-to-board Connectors
- Wireless Antennas
- Terminal Blocks
- Edge Card Connectors
- Optical Connectors
bisco industries is a premier distributor of Molex products. bisco provides personal service to our clients through our 48 local offices and 6 strategic distribution centers. We also offer complete product data, pricing, and availability info at biscoind.com. To find the Molex product you need simply search the Molex part number or browse the Molex catalog at biscoind.com.
Molex: Helping Technology Companies Push Boundaries
Molex’s History of Innovation
For decades Molex has been providing innovative solutions to the electronics industry. In fact, Molex products were essential to the first car radio, the first cellular phone and the first HDTV. Molex began in 1938 with the invention of a moldable thermoplastic that founders, Frederick and Edwin Krehbiel, named Molex. In the years following the company expanded into the burgeoning consumer appliance industry.
Molex Today
Today, Molex has 45 manufacturing facilities across the world and an ever growing catalog of standard and custom products. Among Molex’s many products are terminals, terminal blocks, edge card connectors, board-to-board connectors, backplane connectors, cable assemblies, and antennas. Not only is Molex’s selection of electronic components unparalleled but they continue to invest in research and development to improve manufacturing efficiency while maintaining superior quality.
Your Source for Molex
bisco industries is a premier stocking distributor for Molex. We offer online pricing on hundreds of Molex items as well as a complete browseable listing of Molex products. Visit biscoind.com today to find the right Molex item(s) for your applicaiton.