Technical Specifications Frame rated current 225 A. Rated operational voltage 400 V AC. Short‑circuit breaking capacity N‑class 36 kA. Available for 3‑pole or 4‑pole version. Operating temperature ‑25 ℃ to +70 ℃, storage temperature ‑40 ℃ to +85 ℃. Module surface IP20 for cabinet inner installation. Complies with IEC 60947‑2 standard.
Functional Features Provides thermal‑magnetic overload and short‑circuit protection. Manual switching on‑off operation. Supports optional auxiliary contact and shunt trip accessories. Clear mechanical position indicator for breaker status. Built‑in arc‑extinguishing chamber structure.
Application Scenarios Applied for low‑voltage power distribution protection of industrial workshop, power plant auxiliary cabinet and commercial building. Used for cable protection and motor load distribution loop protection. 
Performance Parameters Thermal overload protection follows inverse‑time characteristic. Magnetic short‑circuit protection acts instantaneously. Arc‑extinguishing chamber reliably cuts off fault current. Mechanical service life reaches specified cycle requirement.
Material Composition Flame‑retardant thermoplastic molded housing. Bimetallic thermal‑overload component, magnetic trip unit. Silver‑alloy contact points. Arc‑extinguishing metal grid group.
Structural Characteristics Compact molded case structure. Front‑panel fitted with manual operating handle. Terminals arranged on upper and lower sides for cable connection. Supports fixed mounting and DIN‑rail installation. Weight approximately 1.45 kilogram.
Working Principle Under overload condition, bimetallic strip heats and deforms, triggers tripping mechanism. Under short‑circuit fault, magnetic component generates instantaneous magnetic force to drive trip action. Arc generated during breaking is eliminated by arc‑extinguishing grid. Mechanical handle reflects breaker closing, opening and tripped status.
Installation Requirements Fix breaker inside distribution cabinet by screw fixing or DIN‑rail buckle. Complete incoming and outgoing cable wiring, tighten terminals to specified torque.
Usage Notes Do not exceed frame rated current and breaking capacity. Tighten cable terminals to avoid over‑heating. Keep breaker surface free of dust accumulation. Do not modify internal trip components. Perform trip function inspection during maintenance cycle.
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