Technical Specifications 3‑pole main circuit, rated current 630A. PR221DS‑LSI electronic trip unit, includes overload, short‑time delay and instantaneous protection function. Rated working voltage conforms to low‑voltage distribution standard. Operating temperature ‑25 ℃ to +70 ℃, storage temperature ‑40 ℃ to +85 ℃. S type breaking capacity.
Functional Features Electronic trip unit realizes adjustable overload, short‑time delay and instantaneous short‑circuit protection. Manual closing and opening operation. Front‑panel status indicator displays breaker closing or opening state. Supports fixed mounting connection. Provides reliable short‑circuit and overload protection for power distribution circuit.
Application Scenarios Main circuit protection component for industrial low‑voltage power distribution cabinet. Used for motor center, power supply inlet and large‑capacity load loop protection.
Performance Parameters Stable overload long‑time protection action characteristic. Accurate short‑time delay protection response. High short‑circuit breaking performance.
Material Composition Flame‑retardant thermoplastic molded case housing. Metal contact assembly, arc‑extinguishing chamber, electronic trip unit assembly. Mechanical operating mechanism and wiring terminals.
Structural Characteristics Standard molded case three‑pole breaker structure. Upper and lower sides equipped with main circuit wiring terminals. Front side has manual operating handle and status indication window. Rear side reserved installation holes for cabinet fixed mounting.
Working Principle When short‑circuit fault appears, instantaneous or short‑time delay protection acts rapidly, drives mechanical mechanism to separate main contact, cuts off fault loop. Arc‑extinguishing chamber eliminates electric arc generated during breaking process.
Installation Requirements Confirm circuit power is cut off before installation. Fix circuit breaker on cabinet mounting rail or mounting plate. Connect incoming and outgoing main circuit cables to upper and lower terminals, tighten terminals according to specified torque. Complete setting of overload and short‑circuit parameters according to load requirement. Switch on power, test closing and opening operation.
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