Technical Specifications Rated Voltage: 600V AC Trip Current Rating: 400A Pole Configuration: 3 Pole Short‑Circuit Interrupt Capacity: 200kA AIC @480V AC Trip Unit Type: LI Thermal‑magnetic trip Mounting Form: Bolt‑on cabinet mounting Operating Temperature: ‑40℃ to +70℃ Storage Temperature: ‑50℃ to +85℃ Relative Humidity: 5%‑95%, non‑condensing Certifications: UL, CE industrial electrical compliance
Functional Features High‑capacity built‑in current‑limiting fuse assembly for high‑magnitude short‑circuit current suppression. Thermal‑magnetic combined trip realizes overload delay and short‑circuit instant protection. Front manual operation handle with pad‑lock function for maintenance safety isolation. Mechanical visual trip indicator displays fault tripping status. Ultra‑high short‑circuit breaking performance for heavy‑fault industrial power grid environment. Mechanical dimension compatible with TBC series power distribution cabinet installation structure.
Application Scenarios Heavy‑industry enterprise low‑voltage main incoming feeder protection. Power plant auxiliary power cabinet heavy‑load branch circuit protection. Large‑capacity industrial motor group power supply loop protection. Old‑generation GE Tri‑Break power distribution system spare‑part replacement. Process manufacturing plant main distribution cabinet fault isolation.
Structural Characteristics Heavy‑duty reinforced molded insulation housing with large‑volume arc‑quenching chamber. Front‑side manual operation handle and fault‑trip status observation window. Built‑in large‑specification current‑limiting fuse modules. Top‑and‑bottom heavy‑duty copper bolt‑on terminals for thick‑gauge power cable connection.
Working Principle Continuous overload current heats bimetallic thermal element, generates bending deformation to trigger delayed mechanical tripping. Short‑circuit huge current excites magnetic coil to complete instantaneous trip action. Matched internal current‑limiting fuses cut off and limit fault‑current peak synchronously. Electric arc generated at contact separation is cooled and extinguished inside multi‑plate arc‑quenching chamber. Mechanical trip indicator maintains fault state until manual reset operation.
Installation Requirements Fix breaker inside NEMA‑1 standard power distribution cabinet through bolt‑on installation. Complete reliable protective grounding complying with local electrical safety specification. Fasten cable terminal bolts strictly follow manufacturer‑recommended torque value.
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