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- - Allen‑Bradley 440E-A13501 Contact Block (Lifeline 3 Rope Pull Switch Replacement Accessory)
    
    Product Overview
    
    440E-A13501 is a replacement contact block spare part for Rockwell Guardmaster 440E Lifeline 3 series safety rope pull emergency stop switches, not a complete rope pull switch body. It serves as the internal switching core for cable pull emergency stop devices, with a contact configuration of 2 NC safety contacts + 2 NO auxiliary contacts, used to replace aged, burnt or failed contact assemblies during equipment maintenance without replacing the entire switch housing.
    
    440E Lifeline 3 Rope Pull Switch Complete Unit
    
    Core Contact Specifications
    
    Contact Layout
    
    Safety contacts: 2 × Normally Closed (2NC) redundant safety circuits (core emergency stop signal)
    
    Auxiliary contacts: 2 × Normally Open (2NO) fault feedback signal output to PLC
    
    Electrical Ratings
    
    AC-15: 250V / 5A
    
    DC-13: 24V / 3A
    
    Insulation voltage: 600V
    
    Mechanical service life: ≥1 million actuation cycles
    
    Safety Design
    
    Dual-channel NC safety contacts realize redundant monitoring, support matching safety relays to reach Cat.3 / PL d safety level conforming to ISO 13850 machinery emergency stop standards.
    
    Compatible Host Switch Series
    
    Only fits 440E Lifeline 3 cable pull rope switches (max cable span 30m):
    
    440E-D13 series straight-body rope pull switches
    
    440E-D2 series angle-mounted rope pull switches
    
    Cannot be used for Lifeline 4 / Lifeline 4 stainless steel / Lifeline 5 series pull switches.
    
    Key Functions
    
    Spare replacement core component
    
    Directly replace the internal contact assembly of Lifeline 3 rope pull switches; only the contact block needs replacement when contact ablation or poor contact occurs, saving maintenance cost.
    
    Redundant safety emergency stop signal output
    
    Dual NC safety contacts form hard-wired safety circuit, connect to 440R-N23126 safety relay; pulling the safety rope disconnects both NC channels simultaneously to cut machine power contactor coil.
    
    Independent fault feedback signal
    
    2NO auxiliary contacts output trip status to PLC digital input module, upload emergency stop alarm to HMI for fault recording and display.
    
    Integrated cable slack fault detection linkage
    
    Matches the mechanical locking structure of the pull switch body; triggers contact trip when the safety rope is over-pulled or loose, realizing dual protection of pull trip / slack trip.
    
    Quick disassembly design
    
    Modular plug-in structure, no need to remove the entire switch housing from the machine frame during replacement, greatly shortening on-site downtime.
    
    Matching Supporting Automation Equipment
    
    Safety control components
    
    440R-N23126 dual-channel safety relay, AC contactors, 24VDC control power supply
    
    PLC & HMI systems
    
    SLC 500 (1747-L532 CPU + 1746 digital input modules)
    
    MicroLogix 1200 series (1762-L40BWA + 1762-RPLRTB40 terminal block)
    
    PanelView / GE IC755CSW07CDA industrial touch screen
    
    Network & distribution devices
    
    1783-MMX14T2S Stratix managed Ethernet switch, 140M-I8P-C50S motor protection circuit breaker