The 440G-MZS20SNRJ is a safety guard lock switch from the Guardmaster 440G-MZ series. This product line is specifically designed for machine safety, monitoring and protecting guard doors, enclosures, or access points in industrial environments. It integrates safety interlocking with physical locking functionality to prevent unauthorized or accidental entry into hazardous machine areas, thereby complying with global safety standards and reducing the risk of workplace injuries.
1. Core Identity and Compliance
- Brand & Series: Guardmaster brand (a leading brand in industrial safety solutions); part of the 440G-MZ safety interlock switch series.
- Lifecycle Status: Typically marked as “Active” (currently in production), ensuring long-term availability for industrial maintenance and new installations.
- Safety Certifications: Complies with core global safety standards including EN ISO 14119 (Safety Interlocking Devices) and IEC 60947-5-3 (Safety Switching Devices), meeting SIL 3 (Safety Integrity Level) and PLe (Performance Level e) requirements—suitable for high-risk machinery applications (e.g., presses, robotic work cells).
2. Key Technical Specifications
Safety and Locking Performance
- Locking Type: Non-contact electromagnetic locking (prevents guard opening during hazardous equipment operation); provides robust locking to resist tampering or vibration interference.
- Unlocking Condition: Requires a valid safety signal (e.g., machine stop) to release electromagnetic locking, ensuring safety before personnel access.
- Actuator Compatibility: Designed for compatible Guardmaster actuators (e.g., 440G-MZ series) to ensure precise alignment and switching action.
Electrical Parameters
- Operating Voltage: Standard industrial safety circuit 24V DC; low-power design prevents overheating.
- Output Configuration: 2 sets of safety contacts (Normally Closed, NC) for safety circuit integration; optional auxiliary contacts available (for status monitoring, e.g., “guard closed” or “lockout activated”).
- Response Time: <10 milliseconds (sufficient to trigger immediate equipment shutdown upon guard compromise).
Environmental & Physical Specifications
- Operating Temperature: -20°C to 60°C (-4°F to 140°F) — withstands extreme temperatures in factory workshops or outdoor enclosures (requires protective housing).
- Protection Rating: IP67 (dustproof, withstands brief immersion) and IP69K (optional, for high-pressure/steam cleaning in food, beverage, and pharmaceutical industries) — suitable for harsh, humid, or dusty environments.
- Mechanical Durability: Supports up to 1 million mechanical operations (long-term service life under high-frequency guard opening/closing cycles); shock and vibration resistance compliant with IEC 60068 standards.
3. Core Features and Advantages
- Dual Safety Functionality: Integrates “Safety Interlock” (disconnects safety circuit when guard is open) with “Physical Locking” (electromagnetic guard locking) — eliminates need for additional interlock devices and locks, simplifying installation.
- Tamper-Resistant Design: Features anti-tamper structures (e.g., encrypted actuator recognition, safety-rated terminal blocks) to prevent bypassing safety functions (a common cause of industrial accidents).
- Status Monitoring: Optional LED indicators (e.g., green for “locked/guard closed,” red for “unlocked/guard open”) and auxiliary outputs enable real-time monitoring via HMI or PLC—reducing troubleshooting time.
- Flexible Installation: Offers multiple mounting options (surface-mounted/flush-mounted), compatible with standard guarding profiles (e.g., 40x40mm extruded aluminum), adapting to diverse mechanical guarding structures.
4. Typical Application Scenarios
- Hazardous equipment protection (e.g., CNC machines, injection molding machines, conveyors with moving parts).
- Food, beverage, or pharmaceutical production lines (requiring IP69K protection rating for sterilization compliance).
- Automotive assembly plants (robotic work cells, welding stations)—frequent guard opening and high safety levels are critical.
- Packaging machinery (guards must remain locked during high-speed operation to prevent material jams or operator injury).
Models: Rockwell Guardmaster 440G-MZ Guardlock Switch 440G-MZS20SNRJ
Delivery information typically includes delivery times, shipping methods, packaging, etc., which may vary depending on the seller and the location of purchase.
Manual Downloads
📄
Rockwell Guardmaster 440G-MZ Guardlock Switch 440G-MZS20SNRJ datasheet.pdf
Download Available
Frequently Asked Questions
What is the primary function of the Guardmaster 440G-MZS20SNRJ switch?
The 440G-MZS20SNRJ is an electromagnetic guard lock switch designed to monitor and physically lock safety doors or access points on hazardous machinery, preventing access until equipment is completely stopped.
What safety certifications does the 440G-MZS20SNRJ comply with?
It complies with EN ISO 14119 and IEC 60947-5-3 standards, and meets SIL 3 (Safety Integrity Level) and Performance Level e (PLe) safety requirements.
Can this safety switch be used in wet or washdown environments?
Yes, it features an IP67 protection rating for water submersion resistance, and supports optional IP69K rating, making it suitable for high-pressure and steam washdowns standard in food, beverage, and pharmaceutical facilities.
What is the operating voltage and response time of this switch?
It operates on a standard industrial safety voltage of 24V DC, and has a rapid response time of less than 10 milliseconds to immediately stop equipment in case of safety breaches.
What is the holding force capacity of the electromagnetic lock?
The switch provides a robust physical holding force (Fzh) of 2500 Newtons (equivalent to 562 lbs) to firmly secure safety guards and prevent tampering or accidental opening.
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