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GE SKHB36BC1200

Product Name:​ GE Spectra RMS™ SK1200 Frame Molded-Case Circuit Breaker with MicroVersaTrip® Plus Trip Unit
Introduction:​ A high-capacity molded-case circuit breaker from GE’s Spectra RMS SK series. The SKHB36BC1200 features a 1200 A frame, 3 poles, 600 V AC maximum, a MicroVersaTrip® Plus electronic trip unit, and provides adjustable overload and short-circuit protection for large electrical distribution systems.
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Detailed content

Order-Code Breakdown:
  • SK​ – SK1200 frame (1200 A frame size)
  • HB​ – 50 kA interrupting rating at 480 V AC (standard UL)
  • 3​ – 3 poles
  • 6​ – 600 V AC maximum UL voltage
  • B​ – MicroVersaTrip® Plus trip unit
  • C​ – LSIT trip function (Long-time, Short-time, Instantaneous, Trip target)
  • 1200​ – 1200 A sensor rating
Technical Specifications:
  • Frame Rating:​ 1200 A (UL 489); 1250 A (IEC 947-2) at 690 V AC max (SKL/SKP only)
  • Poles:​ 3
  • Maximum Voltage:​ 600 V AC (UL/CSA)
  • Interrupting Rating at 480 V AC:​ 50 kA (standard UL)
  • Trip Unit:​ MicroVersaTrip® Plus (electronic, adjustable)
  • Trip Functions:​ LSIT (Long-time, Short-time, Instantaneous, Trip target)
  • Rating Plugs:​ Field-installable front-mounted rating plugs to establish ampere rating
  • Terminal Lugs:​ Front connection, Cu/Al rated (e.g., TCAL81: (3) 3/0–500 Cu / (3) 3/0–500 Al)
  • Reverse Feed:​ Suitable for reverse feed
  • Standards:​ UL 489, CSA 22.2 No. 5, IEC 947-2
Key Features:
  • MicroVersaTrip® Plus electronic trip unit with adjustable long-time, short-time, instantaneous, and trip-target functions
  • 50 kA interrupting capacity at 480 V AC
  • 1200 A frame with field-adjustable rating plug for flexible ampere rating establishment
  • Suitable for reverse feed applications
  • Digital, solid-state, RMS-sensing trip system
Materials & Construction:​ Molded-case housing; MicroVersaTrip® Plus electronic trip unit; front-mounted rating plug; TCAL-series terminal lugs for Cu/Al conductors.
Structural Features:​ 3-pole construction; draw-out capable design; front-mounted rating plug for on-site ampere rating changes; suitable for reverse feed.
Working Principle:​ The MicroVersaTrip® Plus electronic trip unit digitally samples the phase currents, computes the true RMS value, and applies the LSIT protection algorithm. When current exceeds the long-time, short-time, or instantaneous thresholds (as defined by the rating plug and trip-unit settings), the trip actuator opens the contacts, interrupting the fault.
Application Scenarios:​ Main incoming breakers for large 600 V AC distribution systems; feeder protection in industrial plants, commercial buildings, and utilities; applications requiring 1200 A frame size with 50 kA interrupting capacity at 480 V.
Installation & Usage Notes:
  • ⚠️ WARNING:​ Danger of electrical shock or injury. Turn OFF the power ahead of equipment before installing this device or removing any other device.
  • Unpack and inspect for shipping damage. Verify that the ampere range, sensor rating, voltage rating, and interrupting rating match the application.
  • Since SK-frame breakers are available in a wide variety of configurations, compare the catalog number of the purchased breaker with the catalog numbering key (Table 1 in GE’s SK-frame installation instructions). Installation of an incorrect breaker could result in misapplication, lack of system coordination, or reduction in system functionality.
  • Install the appropriate field-installable rating plug to establish the desired ampere rating.
  • Use TCAL-series terminal lugs rated for the conductor size (Cu/Al).
  • Ensure proper torque per GE’s installation instructions.
  • This product is NOT suitable for use in equipment not specifically designed to accept it; contact the equipment manufacturer for possible modifications.

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