Technical Specifications Frame size:SFLA. Rated operating voltage:600 VAC. Rated continuous current:250 A. Pole configuration:3‑pole. Interrupting rating:35 kA at 480 VAC. Trip unit type: thermal‑magnetic trip. Line‑side and load‑side main‑circuit terminal connections. Operating Temperature:‑20 °C to +60 °C Storage Temperature:‑40 °C to +85 °C Relative Humidity:5%‑95%, non‑condensing Certifications: UL‑489, CE
Functional Features Thermal‑magnetic overload and short‑circuit fault protection. Manual ON/OFF mechanical operating handle. Built‑in visual trip‑status indicator window. Supports optional auxiliary‑contact attachment installation. Over‑temperature tripping protection response for long‑time overload conditions.
Application Scenarios Industrial‑plant low‑voltage power‑distribution cabinet main‑feeders. Commercial‑building main‑distribution panel branch protection. Motor‑feeder circuit overload and short‑circuit protection. Factory‑floor branch‑circuit protection application points. Low‑voltage switchgear assembly internal protection components.
Performance Parameters Magnetic instantaneous trip threshold: 10 × In. Thermal element provides inverse‑time overload trip curve characteristic. Mechanical operation life: 10 000 cycles.
Structural Characteristics Standard molded‑case compact 3‑pole housing structure. Front‑panel manual operating handle with trip‑status visual indicator. Screw‑type main‑circuit power terminals on both line‑side and load‑side. Side‑mount accessory installation slots for auxiliary‑contact attachments. Flame‑retardant thermoplastic molded outer housing.
Working Principle Over‑load current heats internal bimetallic thermal‑trip strip; thermal deformation of bimetallic strip mechanically triggers trip mechanism. When severe short‑circuit fault occurs, magnetic solenoid component acts instantaneously, pulling trip mechanism and separating main contact points to cut‑off large fault current. Visual trip‑status indicator shows breaker fault‑trip state.
Installation Requirements Install inside qualified low‑voltage switchgear cabinet. Tighten main‑circuit connecting terminals to manufacturer‑specified torque value. Maintain sufficient surrounding clearance for heat dissipation inside cabinet. Installation work must comply with local national electrical‑installation safety standards.
Usage Notes Do not exceed rated continuous current and short‑circuit interrupting capacity. Avoid frequent breaking of large‑magnitude short‑circuit fault current. Inspect internal contact condition after heavy‑fault tripping events. Regularly check main‑circuit terminal tightening torque to prevent poor contact heating risk.
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