440G-LZS21SPLA
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Overview of Allen Bradley 440G-LZS21SPLA
The Allen Bradley 440G-LZS21SPLA is part of the Guardmaster 440G-LZ series of guard locking switches. It features advanced safety interlock technology designed to ensure secure guarding of hazardous machinery by preventing operation while guard doors are open. This model operates on a 24V DC power-to-lock solenoid mechanism with two normally closed safety contacts and one normally open auxiliary contact, delivering dependable safety output signals. Its durable plastic housing and integrated actuator with a 3-meter PVC cable provide sturdy performance in industrial environments. Certified to SIL 3, PLe, and Cat 4 safety standards, the 440G-LZS21SPLA supports high safety integrity levels and compliance with ISO 14119 and IEC 62061 requirements for machinery safeguarding. This makes it suitable for critical safety applications requiring reliable guard locking and door monitoring[1][2][4].Key Features of Allen Bradley 440G-LZS21SPLA
- Power-to-lock solenoid actuator with a 3m PVC cable for flexible installation
- Two normally closed safety contacts (OSSD type) for safety feedback
- One normally open auxiliary contact for guard status indication
- Plastic housing optimized for industrial durability and ease of mounting
- Certified to ISO 14119, IEC 60947-5-3, IEC 62061 with SIL 3, PLe, and Cat 4 ratings
- Low quiescent power consumption (1.5W locked or unlocked state)
- Locking bolt alignment tolerance of ±2.5 mm allowing precise operation
- Holding force up to 1690 N, securing guards effectively against unintended opening
- Diagnostic LED indicators for easy status monitoring on-site
- Designed for safety door interlocking on partial body access guards
Technical Specs of 440G-LZS21SPLA
| Specification | Details |
|---|---|
| Operating Voltage | 24V DC ±10% |
| Safety Contacts | 2 normally closed (PNP, 0.2 A max) |
| Auxiliary Contacts | 1 normally open (PNP, 0.2 A max) |
| Holding Force | 1690 N (EN/ISO 14119) |
| Locking Bolt Alignment | ±2.5 mm |
| Power Consumption | 1.5 W (locked or unlocked) |
| Operating Temperature | -25 to +70 °C |
| Material | Plastic housing |
| Mechanical Life | 500,000 cycles |
| Safety Standards | IEC 62061 SIL 3, ISO 13849-1 PLe, IEC 60947-5-3 |
Applications / Use Case
The Allen Bradley 440G-LZS21SPLA is widely used in industrial automation for safeguarding machinery access points and protecting personnel from hazardous machine operations. It is ideal for use on safety doors, gates, or guards where controlled access is mandatory to prevent accidental start-up or exposure to dangerous machine parts. Typical applications include manufacturing lines, packaging machinery, robotic cells, and conveyor systems. The switch’s power-to-lock function ensures guards remain securely locked during machine operation and only releases with a safe unlock signal. Its robust safety certifications make it suitable for meeting stringent safety requirements in automotive, food and beverage, pharmaceutical, and heavy machinery industries. This switch aids compliance with workplace safety regulations by integrating easily into safety control circuits and providing clear status feedback for system monitoring[1][4][7].Related Resources
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