Product Details
Product Description
The Allen Bradley 440R-W23221 Guardmaster MSR330P is a modular monitoring safety relay designed for machine safeguarding applications. Operating at 24 V DC, it provides immediate output response with three normally open safety contacts and one auxiliary normally closed contact. With DIN rail mounting and removable terminals, the unit ensures ease of installation and reliable performance in industrial environments.
Technical Specifications
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Manufacturer Allen Bradley
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Product Line Guardmaster Safety Relays
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Product Type Safety Relay Module
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Part Number 440R-W23221
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Relay Type MSR330P
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Weight 0.44 lbs (0.20 kg)
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Control Voltage 24 V DC
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Output Relays 3 × Normally Open (NO)
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Auxiliary Output 1 × Normally Closed (NC)
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Response Time 10 ms typical
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Power Consumption 1.5 W
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Mounting Style DIN rail
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Terminals Removable
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Operation Mode Immediate output
Application Scenarios
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Machine safety monitoring with immediate relay response
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Integration into modular safety relay systems
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Industrial environments requiring certified safety relay modules
FAQ
Q: How many safety outputs does the 440R-W23221 provide? A: It includes three normally open safety outputs and one auxiliary normally closed output.
Q: What is the typical response time? A: Approximately 10 ms.
Q: How is the module mounted? A: It is DIN rail mountable with removable terminals for easy wiring.
Comparable Models
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440R-W23221: MSR330P safety relay with immediate output (this model)
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440R-W22917: MSR127 safety relay for dual-channel monitoring
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440R-W23232: MSR300 expandable safety relay with configurable logic
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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Industrial automation systems rely heavily on Programmable Logic Controllers (PLCs) to maintain uninterrupted production. When a PLC unexpectedly shifts from Run to Stop mode, whole manufacturing lines stall.
As control systems evolve across modern factory automation, understanding the root causes of these interruptions helps engineers minimize costly downtime. This technical guide breaks down why PLCs trip into Stop mode and provides practical strategies to mitigate system faults.
Understanding Root Causes of Unplanned PLC Stop Mode in Industrial Automation
Modern Programmable Logic Controllers manage execution through distinct operational states: Run, Stop, Start-Up, and Hold. During power-up, a controller initializes memory registers within Stop mode before briefly transitioning to Start-Up mode. During this phase, internal self-diagnostics evaluate system integrity across hardware and user programs. If the controller detects no critical faults, it enters Run mode to execute the control program continuously. However, any severe system anomaly forces the CPU back into Stop mode immediately to prevent erratic machine behavior across the plant floor.