Westinghouse and Cutler-Hammer WLI Load Break Switches:
Westinghouse has been making load break switches since 1950, with 5KV-15KV the most popular sizes. The earliest switches actually were non-load break types, and were called Westinghouse LBF switches, while the next generation of switches were dubbed WLI load interrupters. Also made by Cutler-Hammer, WLI type load break switches were manufactured through 1980. Cutler Hammer currently makes the MVS load break switch, available in 5KV-15KV and 38KV.
ITE HPLC and ABB Load Break Switches:
ITE started making load break switches right after WWII, again with the most popular sizes being 5KV and 15kV. The ITE models were called the HPLC Load break Switch, and they came in both fused and non–fused varieties and were produced for over 30 years. ITE was sold to Gould and then Brown Boveri before ultimately resting under the ABB moniker, and continued to market the HPLC load break switch throughout. ABB produced their own load break switch called the ABB Versa Switch, that came in the standard 5KV, 15KV and 38KV ratings and were available for a very limited time from 1970-1980.
General Electric Load Break Switches:
As General Electric by far built the most switchgear in the United States from 1945 – 2000, GE load break switches were the most popular models. And the best-selling model was called the SE-100S Load Break Switch. The switch had a stored energy (SE) design and came in many different configurations including NEMA 1 Indoor and NEMA 3R outdoor and fused or non-fused. As a cost-efficient way to get complete plant distribution, General Electric often made large switchgear lineups with their load break switches as they generally cost less than their smarter brother the circuit breaker.
Where and Why to Buy Load Break Switches and Parts:
Both Electric Control Equipment Company and Circuit Breakers Sales Northeast offer a huge inventory of every generation of medium voltage switches. More important, we stock thousands of standard and hard-to-find parts for load break switches, the most common of which are the right 5KV and 15KV fuses needed both for replacement and spares, often found sitting in a “pocket” in the front door of the switch.
Interestingly, load break switches from different manufacturers always need different parts, as diverse designs produced diverse weak points. For example, on the GE SE-100S load break switch, the “whipper blades” will fail as a small contact on the blade often breaks off as the blades whips into the arc chute. Westinghouse and Cutler-Hammer WLI switches seem to always require mechanism parts, as the torque put on the mech during closing tends to break key parts. ITE HPLC load break switches constantly require handle assemblies or porcelain push rods that frequently break, just as the ABB Versa Switch also had problems with their glastic push rods.
Electric Control and Circuit Breaker Sales Northeast are a consortium of switchgear and circuit breaker experts with decades of knowledge and experience gained from working closely with the manufacturers themselves, We are well-versed in dealing with Westinghouse, Allis Chalmers, Siemens Allis, Federal Pacific/Federal Pioneer, General Electric, ITE/ABB and Cutler Hammer and others. We understand functions, types, components, voltage ratings, ampere ratings, ampere interrupting capacity, testing, electrical arc, effects of current flow, thermal energy, magnetic trip elements and every other detail behind the proper functioning of all your circuit breakers and associated electrical equipment. Combine that expertise with nearly 200,000 square feet of inventory, shop and test space, and we are the one-stop source for all your load break switch needs.