K-type frame 1200A circuit breaker three-phase | GE TKMA3Y1200

GE TKMA3Y1200 K-Frame Circuit Breaker

The GE TKMA3Y1200, also cataloged as the TKMA3 Molded Case Circuit Breaker, operates as a dedicated hardware component for overcurrent protection and fault isolation within high-capacity electrical distribution systems. Configured as a 3-pole electrical circuit interrupter, this hardware handles continuous current magnitudes up to 1200 A at maximum potential limits of 600 VAC or 250 VDC. The mechanical assembly utilizes an integrated thermal-magnetic trip unit to execute inverse-time overload delay behavior alongside instantaneous short-circuit protection circuits. The feed-thru structural configuration provides direct physical termination for line and load conductors via robust integrated mechanical lugs.

Hardware Specifications

Industrial Control & Drive Features

The physical integration of this K-Frame module incorporates mechanical structural parameters that align with high-capacity panelboards. This structural stiffness mitigates localized frame deformation during heavy short-circuit magnetic repulsions. To optimize performance in multi-breaker panels, the design addresses technical limits like I/O density scaling inside specialized distribution sections. The internal contact structure features high arc-quench efficiency, which directly lowers the fault clear times across Profinet / EtherNet/IP deterministic networks that monitor downstream power paths. Furthermore, the physical contact geometry minimizes contact degradation, keeping the module parameters consistent with the factory-programmed firmware flash compatibility matrices utilized by intelligent trip units in the same distribution class.

Frequently Asked Questions

Q: What are the exact interrupting capacities of the TKMA3Y1200 breaker under UL testing standards?

A: The hardware provides an interrupting rating of 42 kA at 240 VAC, 30 kA at 480 VAC, and 22 kA at 600 VAC.

Q: Can this specific circuit breaker be used in DC voltage applications?

A: Yes, the module functions securely in DC systems up to a maximum physical rating of 250 VDC.

Q: How does the thermal-magnetic trip unit handle different types of electrical faults?

A: The thermal bimetal element executes delayed tripping during sustained overloads, while the magnetic element executes immediate contact separation during high-magnitude short-circuit events.

Field Installation Guidelines

First, confirm that the main upstream electrical source is completely isolated, and lock out all isolation points according to standard industrial safety practices. Verify the dead state of the busbars using a properly rated digital multimeter prior to structural integration. Position the heavy-duty K-frame assembly onto the pre-drilled panel mounting plate, and fasten it securely using the specified industrial machine bolts. When connecting the line and load conductors, strip the insulation to the proper length to ensure no bare wire is exposed outside the lug body. Tighten the line and load mechanical lugs using a calibrated torque wrench, conforming exactly to the manufacturer's specified torque rating to prevent loose connections and subsequent thermal hotspots. Maintain a minimum physical clearance distance around the arc chute exhaust vents to permit unhindered gas dissipation during high-current fault interruptions.