Technical Specifications Rated Operating Voltage: 600V AC Trip Rating: 300A Number of Poles: 3 Pole Short‑Circuit Interrupt Rating: 200kA AIC @480V AC Trip Type: LI Thermal‑magnetic trip unit Mounting Type: Bolt‑on cabinet mounting Operating Temperature: ‑40℃ ~ +70℃ Storage Temperature: ‑50℃ ~ +85℃ Relative Humidity: 5%‑95%, non‑condensing Certifications: UL listed, CE compliance
Functional Features Integrated high‑performance current‑limiting fuses for sharp short‑circuit current suppression. Thermal‑magnetic dual protection for overload and short‑circuit fault response. Front‑panel manual switching handle with pad‑lock safety function. Visual mechanical trip indicator for quick fault status judgment. Superior high‑fault‑level breaking capacity for heavy‑industry power distribution scenario. Standard mechanical structure compatible with TB4 series cabinet mounting cut‑out.
Application Scenarios Heavy‑industry factory low‑voltage main feeder circuit protection. Large‑capacity motor power supply branch protection. Legacy GE Tri‑Break distribution system spare‑part replacement. Process plant workshop power distribution cabinet main‑loop protection. Commercial complex heavy‑load power supply loop fault isolation.
Performance Parameters Overload trip characteristic: Follows standard thermal‑magnetic time‑current curve Maximum symmetrical interrupting current: 200kA @480V AC Current‑limiting efficiency: Significantly reduces short‑circuit energy released to downstream equipment Shock and Vibration Resistance.
Structural Characteristics Reinforced molded case insulation housing with built‑in multi‑plate arc‑quenching chamber. Front‑mount manual operation handle and transparent trip‑status observation window. Replaceable internal current‑limiting fuse cartridge assembly. Top and bottom heavy‑duty copper bolt‑on terminals for large‑gauge cable connection.
Working Principle Persistent overload current heats internal bimetallic strip to produce mechanical deformation, triggers delayed trip action. Severe short‑circuit current drives magnetic trip coil to instantaneously release contact mechanism.
Installation Requirements Securely fasten breaker inside standard power distribution cabinet via bolt‑on terminals. Carry out protective grounding strictly complying with local electrical code requirements.
Usage Notes Never exceed 600V AC maximum working voltage of this device. Implement lock‑out‑tag‑out procedure by pad‑locking handle to OFF position during maintenance work.
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