Last Updated on October 22, 2023 by Kevin Chen
Have all of the breakers in your main electrical panel stopped working? Do you plan to replace more than one circuit breaker for a long time? Don’t worry because we know what kind of breakers work with Murray.
Murray breakers are, of course, the best ones to use in a Murray breaker panel. Since this brand is going away, you should know what’s available.
In this article, you’ll learn important things, like the size of your breakers, that will help your main panel last longer.
What is a Murray Electrical Panel?
Since its founding in 1899, Murray has been recognized as a reliable brand that consistently provides superior solutions in the field of electrical work. They have provided products that are user-friendly and easy to install, such as circuit breakers, switches, , disconnects, and panel boards. Because the Murray panel is such a classic, many people have a breaker box of its kind in their homes. Electrical panels have gradually replaced fuse boxes since circuit breakers became widely available on the market. This particular brand is very forward-thinking and is currently one of the most advanced panel upgrades that can be purchased.
The hard shell of Murray’s load center is patterned for increased durability. It features a transfer mechanism switch for power interruption, trimmed tabs for direct CB mounting, and the main breaker. Additionally, this load center has a transfer mechanism switch for power interruption.
They were one of the first breakers to appear on the market that featured thermal-magnetic qualities, which enabled magnetic and heat mechanisms control surplus current anytime a fault occurred. As a result, they were one of the first to revolutionize the game of breakers.
Due to the exceptional quality of their products, homeowners considered Murray to be the best early brand for a considerable amount of time. Siemens Company has discontinued Murray circuit breakers as of 2019.
What Characteristics Does a Murray Circuit Breaker Contain?
Murray breakers are thermal-magnetic breakers with one pole. Two ways to turn these breakers on and off are a bimetal switch and an electromagnet.
The bimetal switch stops currents that are too strong. When the current exceeds the limits set, the extra heat makes the bimetal bend, which trips a bar. This turns the trip bar and lets the current go in a different direction, preventing an overload.
The electromagnetic part is an electromagnet with a metal core and a coil of wire around it. When there is an excessive amount of current flowing through the wires, an electromagnet will produce a magnetic field that is powerful enough to attract an armature that is nearby. When the armature moves closer to the electromagnet, an electrical path is made, which stabilizes the electromagnetic coil.
Limitations of Murray Circuit Breakers
The advantage of Murray breakers is their quick excess current control, which can end an arc between breaker contacts in as little as four milliseconds.
Murrays have three significant flaws that could cause breaker failure and necessitate replacing the circuit breaker:
Extremely Vulnerable to Heat
The ability of the bimetal to bend is impacted by temperature increases brought on by electrical current flowing through the breaker, which eventually causes the bimetal to wear out.
Unable to Withstand High Current Loads
Murray’s Circuit breakers can only withstand three to four times the typical full load current. In regions with consistent current flows, this is typically adequate. This can, however, be problematic in areas where current surges occur frequently.
Susceptible to Wear and Tear
Circuit breakers made by Murray use metal strips that weaken as they are exposed to an electric current. Breakers’ ability to trip is affected, and the circuit is at risk of overload.
Which CB Brand Is Best for Your Electrical Main?
Murray circuit breakers are compatible with a wide range of breakers on the market. Because of the similarities between different brands’ breakers, you can swap them out without fear of introducing an arc fault into your electrical system.
So, who do you think is the best manufacturer for the job? Siemens, of course, is the most well-known brand.
As a Siemens subsidiary, Murray’s components are similar to those of Siemens. Because of this, Murray panels manufactured after January 2002 can be used with Siemens CBs, according to their letter of substitution. For use with the Murray panels, these CBs are UL-listed.
These panels include EQ Small Circuit Load Centers, Murray Meter Combo load centers, and Rock Solid load centers, among other options. Here is a Siemens cross-reference table for Murray circuit breakers.
Only Murray products cross-listed with Siemens in 2002 and later were available. The approved breaker types for your panel can be found on the wiring diagram inside your panel door for other Murray brand load centers manufactured before that year.
Are There Other Murray Compatible Brands?
As an alternative to the Siemens products, Murray load centers have compatibles that are not cross-listed within the Murray panels. There are three brands of breakers that I can recommend. However, it’s essential to check your local regulations before using them.
The Air Circuit Breakers are the first to be discussed and differ significantly from their Murray counterparts. These devices’ safety mechanisms only work when exposed to specific pressures in arc-extinguishing media.
This breaker can control excess current, but contractors only use it for low voltage applications (not exceeding 450 Volts).
Square D Circuit Breakers are the next in line. Due to the same mechanics as Murray’s counterpart, this one resonated with me. The brand’s solid construction, simple setup, and dependable performance have made it one of my go-to choices. In addition, an indicator flag lets you know when a breaker has tripped. Indeed, Square D electrical components have a high level of safety.
As a final point, Cutler-Hammer Circuit Breakers are known for their ability to maintain current control for a long time. Before you use these in place of Murray or any other brand, you should make sure to check the legality of the installation with the local building code.
Breakers that fit into your panel may not all be legitimate and trustworthy. Three products can replace Murray. However, if you’re looking for a UL-listed legal breaker substitute, Murray’s Siemens is the best option.
What’s the Best Number of Breakers for Murray?
An electromagnet and bimetal switch are two of the mechanisms that can be used to switch the Murray circuit breakers on and off. Many owners have exceeded their breaker limits because of this structure.
Murray breakers frequently fail in their attempts to break the rules. The bimetal is exposed to extreme heat due to excessive current flow. This happens because the metal strips weaken over time as the breaker is exposed to electrical currents.
In spite of the fact that Murray products are no longer available for purchase, they made their main panel compatible with a variety of different breaker types. If you are concerned about the size of your breakers, you should follow the regulations established by the NEC as well as the maximum continuous load capacity of your main breaker panel.
In either case, please pay attention to the specifications of the Murray breakers you are using and whether they are compatible with Murray load centers. Rock Solid Load Centers can handle 100A-225A amps and 12to60 circuits. However, the same manufacturer’s Riser, Generator Ready, and 400-Amp Load Centers do not have the exact specifications.
Refer to the Murray Electrical Products catalog page for more information on load centers and circuit breakers, which have “maximum amps per stab.”
Are Murray breakers being discontinued?
It is expected that the Murray brand will be phased out and replaced by Siemens products. Changes in market conditions necessitate this, as well as a plan for the future and a stable supply chain.
Are Murray breakers safe?
Since most of the circuit breakers’ electrical connections are concealed, they also reduce the risk of electrocution and other electrical hazards. The Murray electrical panels are built to withstand the most grueling of environments.
Will Murray breakers work in a GE panel?
Neither of them can be used interchangeably. They may fit, but they are not listed for use in either of the panels. UL-listed breakers aren’t always interchangeable.
What breaker is the same as Murray?
Square D breakers are identical to Murray breakers in terms of their operation. Square D breakers are known for their durability and ease of installation. Safety and reliability are the hallmarks of Square D circuit breakers.
If you already know what device is ideal for your primary electrical panel, it shouldn’t be too difficult to find breakers suitable for use with Murray. Circuit breakers manufactured by Air, Square D, and Cutler-Hammer are suitable alternatives to Murray CBs.
However, the Siemens brand of breakers is the most suitable alternative if you want to get the most out of your original Murray Load Centers. Not only are the products manufactured by Siemens regarded as being of high quality, but the brand is also on the UL approval list for Murray.
It is a brand that is well worth the money, and it is the product with the highest level of assurance that is compatible with your electrical code.
Lastly, for the purchase or more details regarding breaker which are compatible with Murray, contact us at ICRFQ. We manufacture the best electrical components in China.
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