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- - Allen‑Bradley 440R-N23126 (MSR127T) Dual‑Channel Safety Relay
    
    440R-N23126 Safety Relay
    
    Overview
    
    440R-N23126 is a Guardmaster Minotaur series dual-channel safety monitoring relay, model MSR127T, designed for machine safety circuits. It monitors emergency stop buttons, safety interlock switches, light curtains and safety mats, achieving Category 4 / PL e safety level to cut dangerous machine motion reliably when safety signals trigger fault conditions. It adopts red industrial safety housing, standard DIN rail mounting, widely matched with SLC 500, Micro800, ControlLogix PLC systems.
    
    Core Specifications
    
    Power Supply
    
    Rated voltage: 24V AC/DC (50/60Hz)
    
    Operating range: 18–30V AC/DC
    
    Housing width: 22.5mm slim body
    
    Input Circuit (Dual Channel)
    
    Dual-channel NC safety input (S11, S12 / S21, S22)
    
    Supports dual-channel emergency stop, safety door interlock, light curtain
    
    Built-in cross-channel short-circuit fault detection
    
    Contact Configuration
    
    Safety outputs (instantaneous): 3 × NO safety contacts (13-14, 23-24, 33-34)
    
    AC15 rating: 250V / 5A
    
    DC13 rating: 24V / 3A
    
    Auxiliary feedback contact: 1 × NC monitoring contact (41-42)
    
    Used for PLC fault signal feedback, alarm indication
    
    Reset Mode
    
    Dual-mode selectable: Automatic reset / Manual reset
    
    Manual reset: Requires external reset button to reset after safety trip
    
    Auto reset: Automatically closes outputs once safety hazard is removed
    
    Mechanical & Environmental
    
    Mounting: 35mm standard DIN rail
    
    Terminal type: Fixed screw terminals (non-detachable)
    
    Protection class: Housing IP40, terminals IP20
    
    Operating temperature: -5℃ ~ +55℃
    
    Impulse withstand voltage: 2500V
    
    Weight: ~214g
    
    Safety Certification & Standards
    
    Safety performance: Cat.4, PL e, SIL3
    
    Compliant standards: ISO 13849-1, EN 954-1, IEC 60204-1, cULus, CE, BG approved
    
    Key Functions
    
    Dual-channel fault self-monitoring
    
    Detects short/open circuit between two safety input lines; if single-channel fault occurs, the safety relay locks trip status to prevent dangerous hidden failures.
    
    Category 0 safe stop
    
    3 groups of independent safety NO contacts cut main contactor coil power simultaneously to realize hard-wired safety stop of machine motors.
    
    Dual reset logic
    
    Switch between auto/manual reset via internal jumper, adapting to different machine safety regulations (manual reset required for most fixed machinery).
    
    Fault signal feedback
    
    1NC auxiliary contact outputs trip status to PLC digital input module for HMI alarm display and fault logging.
    
    Series expansion capability
    
    Multiple MSR127T safety relays can be cascaded to monitor multiple safety zones of large production lines.
    
    Real-time status LED indication
    
    PWR: Power supply status
    
    CH1 / CH2: Dual safety channel signal status
    
    Quick on-site troubleshooting without measuring instruments.
    
    Compatible Equipment
    
    Safety field devices
    
    Emergency stop pushbuttons, safety door interlock switches, safety light curtains, safety mats (dual NC contact type)
    
    Rockwell PLC systems
    
    SLC 500 (1747-L532 CPU + 1746 series DI modules)
    
    Micro800, ControlLogix 1756 series
    
    Auxiliary components
    
    AC contactors, PanelView HMI touch panels, circuit breakers, 24V power supply