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GE TKMA3Y1200XL
Product Name: GE TKMA3Y1200 1200A 600V 3-Pole Thermal-Magnetic Molded Case Circuit Breaker (K1200 Frame)
Product Introduction: The TKMA3Y1200 is a heavy-duty K-frame molded case circuit breaker from GE’s Spectra / TKMA series, rated for 1200 amperes in three-phase 600 V AC power distribution networks. It delivers robust thermal-magnetic protection for large commercial and industrial main incoming feeds, busway risers, and heavy motor loads. The “XL” configuration features a non-adjustable interchangeable trip unit.
Detailed content
Technical Specifications:
- Rated Current: 1200 A
- Rated Voltage: 600 V AC (240/480/600 V AC, 250 V DC)
- Poles: 3
- Frame Type: Series K1200, TKMA
- Trip Unit: Non-adjustable interchangeable thermal-magnetic trip
- Interrupting Capacity (UL): 42 kA @ 240 V AC, 30 kA @ 480 V AC, 22 kA @ 600 V AC
- Terminals: Line and load side lugs (feed-thru)
- Dimensions: 15.5 in (H) × 8.25 in (W) × 5.5 in (D)
- Approximate Weight: 51.87 lb (≈ 23.5 kg)
Functional Features: High breaking capacity for service entrance and sub-main protection; interchangeable trip allows field replacement of the trip unit; feed-thru line/load lugs accommodate large copper or aluminum bus connections; rugged K-frame construction for extended mechanical and electrical endurance.
Application Scenarios: Service entrance protection for large commercial buildings, industrial plant main distribution, transformer secondary protection, large HVAC and process motor feeders, data center power distribution.
Material & Structure: Thermoset molded case; silver-alloy contacts; copper alloy primary conductors; stack-type arc chute; bolt-on or bracket mounted; line/load lug terminals support cable-in/cable-out configurations.
Installation Requirements: Mount vertically on a sturdy switchboard frame or dedicated breaker bracket; tighten main terminal lugs to specified torque (typically 40–60 N·m for Al/Cu); ensure adequate ventilation; connect protective earthing; if ordered with internal options, factory-installed dummy trip unit is required.
Usage Precautions: Do not re-close after a fault without identifying and clearing the fault cause; monitor connection point temperature rise (infrared inspection recommended ≤ 65 K rise); verify trip unit calibration periodically; adhere to HACR requirements for HVAC applications.
