440R-W23221 Allen Bradley Guardmaster MSR330P Safety Relay Module

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

• Manufacturer Allen Bradley

• Product Line Guardmaster Safety Relays

• Product Type Safety Relay Module

• Part Number 440R-W23221

• Relay Type MSR330P

• Weight 0.44 lbs (0.20 kg)

• Control Voltage 24 V DC

• Output Relays 3 × Normally Open (NO)

• Auxiliary Output 1 × Normally Closed (NC)

• Response Time 10 ms typical

• Power Consumption 1.5 W

• Mounting Style DIN rail

• Terminals Removable

• Operation Mode Immediate output

Application Scenarios

• Machine safety monitoring with immediate relay response

• Integration into modular safety relay systems

• 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

• 440R-W23221: MSR330P safety relay with immediate output (this model)

• 440R-W22917: MSR127 safety relay for dual-channel monitoring

• 440R-W23232: MSR300 expandable safety relay with configurable logic