Technical SpecificationsNumber of poles: 2. Rated operational current: 250A. Rated operational voltage: 750V DC. Short-circuit breaking capacity: 25kA @ 750V DC. Trip unit type: thermal-magnetic. Trip curve: C characteristic. Mounting method: panel mount or DIN rail mount. Operating temperature range: -25°C to +70°C. Protection rating: IP40. Certifications: IEC 60947-2, UL 489, CE.
Functional FeaturesThermal-magnetic trip mechanism delivers inverse-time overload protection and instantaneous short-circuit protection. DC-optimized arc chute system reliably extinguishes DC arcs without natural zero-crossing. Padlockable operating handle prevents unauthorized switching. Auxiliary contact and alarm contact options support system integration. Front panel position indicator clearly shows ON/OFF/TRIPPED status.
Performance ParametersRated current: 250A. Rated voltage: 750V DC. Breaking capacity: 25kA. Short-circuit trip time: <10ms. Overload trip time: 10s to 1000s inverse time characteristic. Operating temperature range: -25°C to +70°C. Vibration resistance: 2G @ 10Hz to 500Hz.
Material CompositionMolded case: glass-fiber reinforced flame-retardant polyester. Main contacts: silver-nickel alloy with arc-resistant coating. Arc chutes: steel plates with de-ionizing insulating grids. Terminals: tin-plated high-conductivity copper. Operating mechanism: glass-fiber reinforced nylon with metal pivot pins.
Structural CharacteristicsIt features a compact monolithic molded case, top-mounted toggle operating handle, front face position indicator window, bottom line/load terminal lugs, side auxiliary contact mounting slots, and integrated DIN rail mounting feet.
Working PrincipleUnder normal operating conditions, current flows through the closed main contacts, the bimetallic thermal element and the magnetic trip coil. Under overload conditions, the bimetallic element heats and deflects, releasing the trip mechanism to open contacts. Under short-circuit conditions, the magnetic coil generates instantaneous magnetic force to trip the mechanism. The arc chute splits, elongates and cools the DC arc to extinguish it safely.
Installation RequirementsMount on a flat equipment panel or standard 35mm DIN rail. Torque terminal bolts to manufacturer-specified values based on wire size. Observe correct polarity marking for DC circuit wiring.
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