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Circuit Breakers - Molded Case Circuit Breakers
Spectra RMS* Electronic Trip

Spectra RMS* Electronic Trip

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Break new ground with a new generation of molded case circuit breakers

As part of the continuing development of a new, leading-edge and comprehensive one-line construction package, the Spectra RMS and RMS with microEntelliGuard® technology will be retired and replaced by Tmax XT circuit breakers.  Now is the time to future-proof your investment by taking advantage of Tmax XT advanced technology. Designed to maximize ease of use, integration and connectivity while reliably delivering safety and quality, Tmax XT breakers are key elements of a system that delivers complete flexibility, extreme breaking capabilities and reliable performance under pressure. With seven different sizes and protection features of up to 1600A, there’s a solution for every purpose.  Find the right Tmax XT for your application using the new conversion resources in the Related Tools section of this page.


Spectra RMS Molded Case Circuit Breakers (SE150, SF250, SG600 and SK1200) have a digital, solid state, RMS sensing trip system with field installable, front-mounted rating plugs to establish or change the breaker ampere rating. Adjustable instantaneous with tracking short-time is standard on all frames. The trip unit uses digital sampling to determine the RMS value of sinusoidal and non-sinusoidal currents.


Spectra RMS Molded Case Circuit Breakers with microEntelliGuard* Trip Units (SG600 and SK1200) offer flexible system protection, metering and communication options required on the most advanced electrical systems. Fully adjustable time-current curves (with three long-time curve shapes; MVT I2t, CB, and Fuse I4t) and optional protective relays provide optimal system coordination and protection. In addition to standard metering, the microEntelliGuard trip units are available with ground fault alarm, Reduced Energy Let-Through (RELT), Zone Selective Interlocking (ST/GF/INST), neutral protection, waveform capture, programmable output contacts, advanced metering and direct Modbus communications for integration with EnerVista Viewpoint power system monitoring software. The microEntelliGuardTM trip unit uses the same universal rating plugs and test kit offered for the EntelliGuard TU trip unit as well as common internal accessories used across the entire Spectra RMS family of molded case circuit breakers.


The Extended Instantaneous (Selective) versions of the SK1200 with microEntelliGuard (SKS and SKT) offer all of the features of the standard microEntelliGuard circuit breakers, while adding higher Selective Instantaneous pickups (to 25.5x sensor). GE's waveform recognition Selective Instantaneous allows microEntelliGuard trip units to sense the operation of current limiting devices below, thereby allowing optimum protection settings. When coupled with GE current limiting devices downstream and other Instantaneous Zone Selective Interlock (I-ZSI) capable devices upstream, circuit breakers equipped with EntelliGuard family trip units, including Spectra with microEntelliGuard provide selective coordination without sacrificing arc flash risk.


Features and Benefits

  • Solid State Trip System
    • Accurate Sensing
    • Ambient Insensitive
    • Protective Relays available
    • Communication & Power Management capable
  • Interrupt ratings up to 100kAIC @ 480Vac
  • Reduced Energy Let-Through available for enhanced protection
  • ZSI (ST/GF/INST) available for selectivity
  • Interchangeable Rating Plugs for quick LT rating change
  • Common internal accessories across all frames
  • UL listed field installable accessories
  • HACR rated
  • 100% continuous rating available

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