Allen‑Bradley 440N-G02077 Ferrogard Non-Contact Magnetic Safety Interlock Switch

Product Overview

Core Specifications

• Series: Ferrogard FRS21, Reed magnetic sensing principle
• Supply voltage: 24 VDC
• Contact configuration: 2 Normally Closed (NC) safety contacts + 1 Normally Open (NO) auxiliary contact
• Switching capacity: 1 A @ 24 VDC; 2 A @ 250 VAC
• Sensing distance: Make distance 12 mm, break distance 23 mm, high tolerance for installation misalignment
• Housing: Red molded ABS plastic, rectangular shape; dimensions 76 mm L × 30 mm W × 15 mm D
• Protection rating: IP67 / NEMA 6P, dustproof and resistant to temporary water immersion
• Cable: Integrated 4 m pre-wired black PVC cable, 20 AWG conductors
• Operating temperature: -10 ℃ ~ +55 ℃
• Safety rating: Safety Category 1, compliant with EN 1088, ISO 13849-1
• Certifications: UL, cUL, CE, IEC certified
• Weight: ~0.48 kg
• Included accessories: Standard magnetic actuator, mounting screws, mounting brackets

Main Functions

1. Safety guard position monitoring
    
   Magnetic sensor detects separation between switch and actuator; when safety door/gate opens, dual redundant NC safety contacts open to immediately cut the machine safety circuit and stop dangerous motion.
2. Dual redundant safety contact design
    
   Two independent NC safety contacts form fault-detectable safety loops, preventing single contact failure from losing safety protection.
3. Auxiliary status feedback
    
   The NO auxiliary contact transmits real-time door open/closed signals to PLC HMI for remote status monitoring and fault alarm.
4. Wear-free non-contact operation
    
   No mechanical contact between sensor and actuator, eliminating mechanical abrasion and extending service life under high-cycle frequent switching.
5. Wide installation tolerance
    
   Large sensing gap allows minor positional offset during door assembly, reducing strict precision mounting requirements on-site.

Key Advantages

• Contact-free magnetic reed design with zero mechanical wear, suitable for high-frequency guard door opening cycles
• IP67 waterproof/dustproof plastic housing adapts to washdown, oily, dusty workshop environments
• Dual NC safety contacts meet basic machine safety redundancy requirements
• Pre-installed 4-meter long cable simplifies wiring layout without additional connector assembly
• High misalignment tolerance lowers installation difficulty and avoids false tripping from door vibration
• Compact slim rectangular body fits narrow mounting spaces on machine frames and guard frames
• Standard magnetic actuator matched set, ready-to-use out of packaging

Typical Applications