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Allen-Bradley 440N-G02023 is a high-performance magnetic safety switch in Rockwell Automation's Guardmaster series, designed for safety protection of industrial machinery. It monitors the opening/closing status of movable components such as safety gates and fences. The switch triggers safety contact action via magnetic induction: when the safety gate is opened, it immediately cuts off the power supply to hazardous areas (e.g., motors, hydraulic systems), preventing personnel from entering dangerous zones. Its non-contact design features high anti-interference capability and long service life, suitable for high-safety-level protection scenarios such as stamping equipment, robot workstations, and packaging machinery. It complies with global mainstream safety standards, providing reliable safety interlock protection for industrial production.
- Safety Rating:Complies with EN ISO 14119, achieving PLe/SIL 3 safety level and Cat.4 safety category, suitable for high-risk machinery protection.
- Induction Method:Magnetic induction (non-contact), maximum sensing distance 5mm; no physical contact between switch and magnet, avoiding wear.
- Contact Configuration:2 sets of normally closed (NC) safety contacts, 1 set of normally open (NO) auxiliary contacts; safety contact rating: 250V AC/3A (resistive load), 250V AC/1.5A (inductive load).
- Response Time:≤10ms, quickly cuts off the safety circuit when the safety gate is opened, reducing hazardous exposure time.
- Magnet Characteristics:Supplied with permanent magnet (440N-M2023), temperature range -40℃~85℃, surface-mounted installation.
- Operating Environment:Operating temperature -30℃~70℃, storage temperature -40℃~85℃, relative humidity 5%~95% (non-condensing), protection class IP67 (resistant to flushing and dust).
- Electrical Connection:M12 circular connector (5-pin) for quick plug-in, simplifying installation and maintenance; cable length customizable (1m default).
- Mechanical Specifications:Switch dimensions (L×W×H) 30mm×15mm×10mm, magnet dimensions 20mm×10mm×5mm, weight ~20g (including magnet).
- Certification Standards:UL 508, CSA C22.2 No.14, CE, TÜV certified, compliant with EN 60947-5-3 safety standard.
- High Safety Level Protection:PLe/SIL 3 rating and Cat.4 category meet safety interlock requirements of high-risk machinery, such as monitoring safety gates of stamping and bending machines, effectively reducing work-related injury risks.
- Non-Contact Durable Design:Magnetic induction without mechanical wear, service life 10x longer than mechanical lock switches (≥10⁶ operations), reducing maintenance frequency.
- Harsh Environment Adaptation:IP67 protection allows direct installation in washing areas (e.g., food processing workshops) and dusty foundries, resisting water splashes, oil contamination, and particle intrusion.
- Anti-Interference and Tamper-Proof:Built-in anti-magnetic interference circuit, unaffected by external electromagnetic environments; features magnet loss detection to prevent bypassing safety protection by removing magnets.
- Quick Installation Integration:M12 connector supports "plug-and-play"; switch and magnet can be fixed via screws or adhesives, adapting to various safety gate materials (metal, plastic, glass).
- Automotive Manufacturing Workshops:Installed on protective fences of welding robot workstations, immediately cutting off robot power when the fence gate is opened, preventing personnel from entering the welding area.
- Food Packaging Machinery:Monitors door status of filling equipment; equipment cannot start if the door is not closed, while withstanding high-pressure washing and disinfection in the workshop.
- Metal Processing Equipment:Used on protective 舱门 of CNC lathes and milling machines; the spindle cannot rotate if the door is not locked, avoiding tool injuries.
- Logistics Sorting Equipment:On maintenance access doors of high-speed sorters, cooperating with safety relays to emergency stop equipment when the door is opened, ensuring maintenance personnel safety.
- Pharmaceutical Cleanrooms:Installed on isolation doors of sterile workshops; non-contact design reduces dust accumulation, meeting GMP standards while ensuring proper door closure.
- Ensure alignment accuracy between switch and magnet during installation (deviation ≤2mm), with induction surfaces parallel to each other; otherwise, the sensing distance may shorten or false actions may occur.
- Avoid installing near strong magnetic fields (e.g., electromagnets, large motors); if unavoidable, add magnetic shielding (e.g., stainless steel partitions).
- Cable routing must be away from power cables to avoid electromagnetic coupling interference; M12 connectors must be tightened to the rated torque (0.5Nm) to prevent water ingress and contact oxidation.
- Regularly (quarterly recommended) check magnet adsorption strength and contact conductivity; use a multimeter to measure NC contact resistance (should be ≤1Ω) to ensure the safety circuit is unobstructed.
- During system commissioning, verify the "door open→equipment emergency stop" response time, cooperating with safety relays (e.g., 440R-N23013) to implement a complete safety control loop.


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