What is a Disconnect Switch?
Disconnect switches (also known as isolator switches, safety switches, and load break switches) are used to isolate electrical circuits by interrupting the flow of electrical current. By quickly stopping the flow of power, disconnect switches allow for emergency shutdowns, switching to alternate power sources, and maintenance.

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.