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GE SGLA36AT0600

Product Name:​ GE Spectra RMS™ Electronic Trip Molded-Case Circuit Breaker (SG600 Frame)
Introduction:​ A digitally controlled, solid-state RMS-sensing molded-case circuit breaker from GE’s Spectra RMS series. The electronic trip unit uses digital sampling to determine the true RMS value of sinusoidal and non-sinusoidal load currents, providing precise, adjustable protection. A field-installable, front-mounted rating plug establishes or changes the breaker’s ampere rating.
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Detailed content

Technical Specifications:
  • Frame Type:​ SG600
  • Poles:​ 3
  • System Voltage:​ Up to 600 V AC (120 V, 120/240 V, 240 V, 277 V, 480 V, 600 V)
  • Ampere Ratings (via rating plug):​ 250 A, 300 A, 350 A, 400 A, 450 A, 500 A, 600 A
  • Interrupting Ratings:
    • 100 kA IC at 120 V AC, 120/240 V AC, 240 V AC
    • 65 kA IC at 277 V AC, 480 V AC, 600 V AC
  • Trip Functions:​ LSI (Long-time, Short-time, Instantaneous) with adjustable instantaneous + tracking short-time
  • Continuous Current Rated:​ Standard
  • Reverse Feed:​ Suitable for reverse feed
  • Lugs:​ TCLK365
  • Current Metering / Protective Relays:​ Not included
  • Special Markings:​ HACR
  • Standards:​ UL File #E11592, CSA File #LR40350
Key Features:
  • True RMS digital sensing—accurately evaluates both sinusoidal and non-sinusoidal (distorted) current waveforms
  • Adjustable instantaneous with tracking short-time as standard on all frames
  • Field-adjustable ampere rating via interchangeable rating plug
  • Current-limiting behavior (I²t limiting) protects downstream equipment
Materials & Construction:​ Molded-case housing; electronic trip unit with digital sampling; interchangeable front-mounted rating plug; TCLK365 terminal lugs.
Structural Features:​ 3-pole construction; front-mounted rating plug for on-site ampere rating changes; mechanical durability rated for a minimum of 10,000 no-load operations; electrical durability of 1,000–5,000 operations at rated current (depending on rating); short-circuit withstand of 5× rated interrupting capacity.
Working Principle:​ The digital, solid-state trip system continuously samples phase currents, computes the true RMS value, and compares it against the long-time, short-time, and instantaneous thresholds defined by the rating plug and trip-unit settings. When a threshold is exceeded for the corresponding time delay, the trip actuator opens the contacts, interrupting the fault current.
Application Scenarios:
  • Main incoming breakers for 600 V ac distribution systems
  • Feeder protection in industrial plants, commercial buildings, and utilities
  • Transformer primary protection (note: transformer inrush currents containing high 2nd-harmonic content can cause nuisance trips; coordination with the trip curve is essential)
Installation & Usage Notes:
  • Install per GE’s Spectra RMS MCCB documentation (e.g., GEA12171). Confirm the breaker ampere rating matches the application by selecting the proper rating plug.
  • For transformer protection, verify the breaker setting against NEC/IEC overcurrent coordination limits (e.g., 125 % of FLA without secondary protection, 250 % with).
  • Because the SGLA36AT0600 is a true-RMS electronic trip device, it responds to the heating effect of the current rather than the instantaneous peak—this mitigates nuisance trips on non-sinusoidal inrush but still requires proper coordination for high-magnitude symmetrical inrush (6–10× FLA).
  • Ensure proper torque on TCLK365 lugs (wire range per GE documentation).

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