{"product_id":"440r-em4r2-allen-bradley-guardmaster-safety-relay-expansion-module","title":"440R-EM4R2 | Allen-Bradley | Guardmaster Safety Relay Expansion Module","description":"\u003cp\u003eThe \u003cstrong\u003eAllen-Bradley 440R-EM4R2\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e440R-EM4R2\u003c\/strong\u003e Expansion Module, operates as a dedicated hardware component for safety relay signal augmentation within Guardmaster safety-rated control systems.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e440R-EM4R2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eAllen-Bradley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eSubject to manufacturing batch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.36 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard DIN-rail mount housing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-5 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e3.5 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e24 VDC PELV\/SELV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower-On Delay\u003c\/td\u003e\n\u003ctd\u003e5.5 s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure\u003c\/td\u003e\n\u003ctd\u003eIP40 (IP20 terminals)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFail-Safe State Execution and Safety Architecture\u003c\/h3\u003e\n\u003cp\u003eThe 440R-EM4R2 serves as an expansion unit designed to increase the number of available safety contacts within a safety chain. It utilizes a dedicated architecture to ensure fail-safe state execution, where any detected fault or loss of input signal triggers an immediate de-energization of the safety relay outputs. The module maintains strict electrical isolation between the control circuit and the safety-rated load contacts to prevent unintended activation of machinery in the event of an internal component failure. The logic adheres to defined safety integrity requirements, ensuring that the time-to-output is managed during a transition to the safe state.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: Can the 440R-EM4R2 be configured for hot-swapping?\u003c\/p\u003e\n\u003cp\u003eA: No. The safety relay expansion module must be isolated from the power supply and safety circuit before removal. Hot-swapping is not permitted as it may result in an improper safety state transition or electrical damage to the module interface.\u003c\/p\u003e\n\u003cp\u003eQ: How is the 5.5 second power-on delay managed during a system reset?\u003c\/p\u003e\n\u003cp\u003eA: The internal logic enforces a fixed 5.5 second startup delay to ensure that all internal monitoring diagnostics and self-test routines are completed before the relay outputs can be energized. This interval is non-adjustable and is a programmed constraint for safe power-up sequencing.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Secure the module onto a 35 mm DIN rail within a control cabinet rated for at least IP54. Ensure the unit is mounted in a vertical orientation to allow for convective cooling and to satisfy the specified operating temperature range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring:\u003c\/strong\u003e Use copper conductors sized between 24 and 14 AWG. Tighten terminal screws to the specified torque to prevent high-resistance connections that could lead to voltage drops or thermal degradation of the terminal housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e While the unit is powered via PELV\/SELV circuits, ensure that the common rail is properly referenced to the cabinet's protective earth ground to avoid common-mode noise interference on the safety signals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShielding:\u003c\/strong\u003e Route safety input and output wiring separately from high-voltage AC lines or inductive motor leads to prevent electromagnetic interference (EMI) from triggering nuisance trips.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Allen Bradley","offers":[{"title":"Default Title","offer_id":53548987941048,"sku":"440R-EM4R2","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/440R-EM4R21.jpg?v=1780624969","url":"https:\/\/www.globalpetroparts.com\/products\/440r-em4r2-allen-bradley-guardmaster-safety-relay-expansion-module","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}