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
Redundant Automation Systems: Ensuring Continuous Uptime in Critical Control Infrastructure
System reliability directly determines operational profitability across high stakes process industries. Modern industrial automation platforms must eliminate single points of failure to prevent catastrophic shutdowns. Deploying fault tolerant architecture safeguards complex facilities against unexpected hardware glitches, network disruptions, and maintenance outages.
Understanding Types of Noise in Electronic Circuits and Control Systems
Signal integrity directly determines measurement accuracy and loop stability across industrial automation environments. Electronic noise introduces unwanted stochastic interference into analog loops, sensor feedback lines, and digital fieldbus networks. Understanding how intrinsic electronic noise and external electromagnetic interference manifest allows control engineers to optimize signal conditioning and shield sensitive instrumentation effectively.
Why 24V DC Power Supplies Standardize Modern Industrial Automation
Industrial control cabinets worldwide rely on 24V DC as the universal power standard for field instrumentation, sensors, and controllers. Walk into any manufacturing plant, and you will find PLCs, human-machine interfaces (HMIs), and smart actuators running on extra-low voltage DC. Standardizing on 24V DC enhances operational safety, lowers cabinet footprint, and maintains steady control performance across factory networks.