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Allen-Bradley 440R-K23044 is a high-performance safety relay in Rockwell Automation's Guardmaster series, designed for safety interlock circuits of industrial machinery. It monitors the status of safety devices such as emergency stop buttons, safety door switches, and two-hand control devices. When a hazardous signal is detected, it can quickly cut off the power supply to the dangerous area to prevent personal injury. This relay meets high safety standards, supports various safety circuit configurations, and is suitable for scenarios requiring mandatory safety protection such as stamping machines, robot workstations, and packaging machinery, providing reliable safety protection for industrial production.
- Safety Rating: Complies with EN ISO 13849-1, achieving PLe/SIL 3 safety level and Cat.4 safety category, suitable for high-risk machinery protection.
- Input Configuration: 2 safety inputs (connectable to emergency stop buttons, safety door switches, etc.), supporting normally closed (NC) contact input, input voltage 24V DC±10%.
- Output Configuration: 4 safety outputs (2 sets of dual-channel normally closed contacts), rated electrical parameters 250V AC/3A (resistive load), 250V AC/1A (inductive load); supports forced-guided contacts design to ensure synchronous contact action.
- Response Time: Response time from safety input disconnection to safety output cutoff ≤10ms, quickly cutting off the hazardous circuit to reduce dangerous exposure time.
- Auxiliary Functions: Equipped with manual reset function (triggered by external button), supports automatic/manual reset mode switching; built-in diagnostic LED indicators (power, input status, output status, fault).
- Power Supply: 24V DC±10% power supply, power consumption ≤8W, with reverse connection protection to prevent module damage from reverse power polarity.
- Operating Environment: Operating temperature -25℃~70℃, storage temperature -40℃~85℃, relative humidity 5%~95% (non-condensing), protection class IP20 (suitable for control cabinet installation).
- Dimensions: Width×height×depth approximately 22.5mm×105mm×120mm, DIN rail mounted, saving control cabinet space.
- Certification Standards: UL 508, CSA C22.2 No.14, CE, TÜV certified, compliant with EN 60947-5-1 safety relay standard.
- High Safety Level Protection: PLe/SIL 3 safety rating and Cat.4 category meet safety control requirements of high-risk machinery, such as emergency stop circuits of stamping equipment, ensuring reliable power cutoff in case of danger.
- Forced-Guided Contact Design: Safety output contacts adopt forced-guided structure, ensuring circuit disconnection even if contacts are welded, avoiding safety function failure due to contact adhesion.
- Flexible Circuit Configuration: Supports single-channel and dual-channel safety input configurations, adaptable to emergency stop buttons, safety door switches, light curtains and other safety devices; builds standard-compliant safety circuits without additional components.
- Intuitive Diagnostic Functions: Multi-color LED indicators display power, input status and fault information (e.g., contact adhesion, input disconnection) in real time, facilitating quick troubleshooting of safety circuits.
- Fast Response and Reset: ≤10ms response time reduces hazardous exposure window; manual reset function ensures equipment restart requires manual confirmation after fault elimination, complying with safe operation procedures.
- Metal Processing Equipment: In punch presses and bending machines, connects emergency stop buttons and safety light curtains; immediately cuts off motor power when detecting human hands entering hazardous areas, preventing crushing injuries.
- Robot Workstations: Monitors safety door switches of protective fences; cuts off robot power circuit when the door is opened, and locks via safety relay; restart requires manual reset after door closing.
- Packaging Machinery: Used with two-hand start buttons; equipment can only start when both buttons are pressed simultaneously, preventing body entry into hazardous areas during one-hand operation.
- Logistics Conveying Systems: In maintenance areas of high-speed conveyors, connects emergency stop pull-cord switches; pulling the cord at any position triggers safety relay action to stop the conveyor.
- Food Processing Equipment: Used for safety control of choppers and mixers; safety relay cuts off equipment power when the protective cover is not closed, preventing injury from mixing components.
- Safety input circuits must adopt dual-channel design (e.g., two normally closed contacts in series) to improve circuit reliability, avoiding safety function failure due to single-point faults.
- Distinguish between safety outputs and non-safety outputs during wiring; safety outputs should directly control contactor coils, avoiding connection to non-safety components such as intermediate relays.
- Reset buttons must be installed in positions easily accessible to operators and with visibility of hazardous areas, ensuring safety confirmation before reset.
- Regularly (quarterly recommended) check conductivity of safety circuits; use a multimeter to measure input contact resistance (should be ≤1Ω) and output contact resistance when open (should be ≥1MΩ).
- Install safety relays away from strong electromagnetic interference sources (e.g., frequency converters, motors); if unavoidable, use shielded cables with one-end grounding to reduce interference.
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