Back To Basics

The Magnum DS Family of low voltage power circuit breakers is not an extension of any other low voltage design (Figure 36). It is at the forefront of technology and development. For this reason, it is an excellent design to discuss when certain specific examples are required in this module. Keep in mind, however, all low voltage power circuit breakers do not necessarily offer as many features or use the same advanced technology as Magnum DS . Even though this might be the case, it does not mean that another design does not qualify as a low voltage power circuit breaker, or that there are not other capable low voltage power circuit breakers.

Figure 36. Magnum DS Family of Low Voltage Power Circuit Breakers 2 Frame Sizes
800 Through 5000 Amperes)

Magnum DS is a low voltage power circuit breaker. It is built and tested to all applicable ANSI Standards for low voltage AC power circuit breakers and Underwriter’s Laboratories Listed. Because of its flexible design, an International Electrotechnical Commission rated version of Magnum DS is also available to address international requirements. This IEC version is called Magnum. Everything that is expected of an ANSI rated low voltage power circuit breaker is delivered by Magnum DS , and then some. If you think this sounds a bit biased, it is. Cutler-Hammer is justifiably proud of Magnum DS , and as you learn more and more detailed information about low voltage power circuit breakers, you will most certainly agree.

You will recall a discussion of the areas that might set a low voltage power circuit breaker apart from other types of low voltage circuit breakers. Namely:

You were initially introduced to the primary factors that make the low voltage power circuit breaker unique. Other factors and methods that were rather common with low voltage power circuit breakers but not necessarily unique were also discussed. You will revisit a number of the areas just mentioned. Each topic discussed, however, will be presented in more detail with special emphasis placed on those factors that set the low voltage power circuit breaker apart from other types of low voltage circuit breakers, such as molded case and insulated case circuit breakers. The general topics to be discussed are:

The last section reiterates many of the facts learned with special attention given to the unique factors associated with low voltage power circuit breakers. This summary can serve as a review and a future quick reference.