The breaker may "fit" in the panel but be unsafe or un-listed / un-approved for that use.įirst you don't want an electrical fire or injury.Watch out: there are two separate "no-go" circuit -breaker substitution issues: In our OPINION this would be a convenience issue in that if a breaker trips off more often than wanted it's a nuisance, but it's failing in the "safe" direction" if it turns off power.Īlternatives & Replacements for Murray - Siemens Circuit Breakers Murray breakers may tolerate 3-4 x rated load current, a level significantly-less than other brands. Limited current surge tolerance: in a usage exposed to frequent high but brief current surges the Murray/Siemens breaker may fail to operate properly.Similarly, repeated exposure to over-current and thus to heating of the bi-metallic spring may cause the spring to weaken (the breaker may then fail to trip in response to over-current) Failure of bimetallic strips in the breaker due to wear and tear or due to repeated exposure to heat in addition to the Murray recall notice given below, there may be a more-widespread failure of this component in Murray/Siemens breakers thus reducing the circuit breaker's ability to respond properly to an over-current.Other sources in the electrical industry cite component design features of Murray / Siemens breakers as possible sources of the circuit breaker's poor performance Design Features May Explain poor Murray Breaker Performance Readers should note that both new and used Siemens / Murray circuit breakers performance was similar ( and poor). For those who wish, both that article and also links at the end of this page take readers to the original research. Used UBI-SIemens/Murray breakers performed equally poorly. The graph excerpt shown here, excerpted from CIRCUIT BREAKER FAILURE RATES illustrates that among the breakers tested, the "UBI-Siemens/Murray" breaker was the worst- performing in both new circuit breaker tests. Aronstein in a 2017 study of the response of circuit breakers to an over-current. The Siemens-Murray circuit breakers tested in this study joined UBI as poor performers with significant rates of failure rates among the breakers tested by Dr. Murray Electrical Panel / Circuit Breaker Safety WarningsĬertain circuit breakers that fit in Murray electrical panels may be significantly less-safe than most other brands, whether new (Siemens- Murray as tested) or used (sampled from existing electrical panels). We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We include excerpts from a Siemens - Murray breaker recall notice. Page top photo: A Murray / Bryant EP1515 type circuit breaker. This article describes safety hazards found in Murray (and Siemens) circuit breakers used in Murray or Siemens electrical panels and discusses Murray breaker failure data, causes, and breaker replacement alternatives. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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