Technical Specifications Frame Current Rating: 1200A Pole Number: 3 Pole Rated Operating Voltage: 600V AC Trip Unit Style: Interchangeable thermal‑magnetic trip unit Mounting Method: Bolt‑on cabinet mounting Interrupting Rating: 35kA @480V AC Operating Temperature: ‑40℃ ~ +70℃ Storage Temperature: ‑50℃ ~ +85℃ Relative Humidity: 5%‑95%, non‑condensing Certifications: UL, CE industrial power distribution compliance
Functional Features Interchangeable thermal‑magnetic trip unit supports trip‑current specification replacement on‑site. Thermal overload delay protection and magnetic instantaneous short‑circuit protection. Front‑panel manual operation handle for local switching‑on and switching‑off. Mechanical trip indicator for fault‑action status visual identification. Handle pad‑lock structure for lock‑out‑tag‑out maintenance safety isolation. Heavy‑duty contact structure adapts to long‑time large‑current working condition.
Application Scenarios Heavy‑industry plant low‑voltage main incoming power loop protection. Power plant auxiliary power cabinet large‑capacity branch circuit protection. Large‑scale manufacturing factory heavy‑load motor group power supply protection. Legacy GE TKM series power distribution cabinet spare‑part replacement. Process industrial plant main distribution cabinet fault isolation.
Structural Characteristics Large‑size reinforced molded insulation housing with built‑in large‑capacity arc‑quenching chamber. Front‑side manual operation handle and mechanical trip‑status indication window. Detachable and interchangeable trip‑unit installation cavity. Top‑and‑bottom heavy‑duty copper bolt‑on terminals for large‑gauge power cable connection. Handle pad‑lock mechanical device for maintenance lock‑out‑tag‑out requirement. Internal arc‑shield baffle structure prevents arc‑flash damage to adjacent cabinet components.
Working Principle Persistent overload current heats internal bimetallic thermal element, generates mechanical deformation to trigger delayed tripping. When severe short‑circuit fault occurs, huge fault current excites magnetic trip coil to drive instantaneous trip mechanism.
Installation Requirements Securely fasten breaker inside standard power distribution cabinet by bolt‑on installation. Implement reliable protective grounding strictly complying with local electrical safety codes. Torque cable terminal bolts to manufacturer‑recommended torque value to avoid overheating caused by loose contact.
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