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- - Allen‑Bradley 1489-A1C040 Miniature Circuit Breaker
    
    Product Overview
    
    This is a single-pole miniature circuit breaker from the Bulletin 1489-A series, C-curve trip characteristic with 4A rated current, designed for branch circuit overload and short-circuit protection inside industrial control cabinets. It serves as overcurrent protection for PLC power supplies, relays, sensors, small control loops and low-power auxiliary loads.
    
    Core Specifications
    
    Pole quantity: 1-pole
    
    Rated current: 4 A
    
    Trip curve: C curve (suitable for inductive loads with high inrush current)
    
    Rated operational voltage: 240 VAC / 48 VDC
    
    Breaking capacity: 10 kA at 240 VAC
    
    Terminal type: Screw terminals, wire range 24–12 AWG
    
    Mounting: Standard 35 mm DIN rail
    
    Operating temperature: -20 ℃ ~ +60 ℃
    
    Protection functions: Thermal overload trip, electromagnetic short-circuit instant trip
    
    Status indicator: Built-in mechanical position flag to display ON/OFF/tripped state
    
    Certifications: UL, cUL, CE certified, IP20 cabinet installation
    
    Main Functions
    
    Provide overload protection: Automatically cut off power when continuous load current exceeds rated value to prevent cable insulation burnout
    
    Deliver fast short-circuit protection: Instantly trip under short-circuit fault to avoid equipment burnout and fire hazards
    
    Act as a manual load disconnect switch for safe maintenance power cut-off
    
    Protect sensitive low-power control components including power supplies, transmitters and small servo auxiliary circuits
    
    Key Advantages
    
    Compact narrow body saves cabinet space; C curve tolerates startup inrush of coils and power supplies without nuisance tripping. Visible trip status flag for quick fault judgment. DIN rail plug-in design enables fast replacement. Complete short-circuit and dual thermal-magnetic protection improves circuit safety.
    
    Typical Applications
    
    PLC auxiliary power branch protection, sensor and transmitter power circuits, relay control loop protection, small fan, indicator light and solenoid valve load protection, automation cabinet secondary distribution circuits