440R-D22R2

Overview of Allen Bradley 440R-D22R2

The Allen Bradley 440R-D22R2 is a dual input Guardmaster Safety Relay designed for high-integrity safety applications. This safety relay uses a single-wire safety connection for straightforward installation and expandability, reducing wiring complexity while maintaining compliance with international safety standards. The 440R-D22R2 features universal inputs that are compatible with a wide range of safety devices, including emergency-stop buttons and proximity switches, making it a flexible choice for diverse industrial systems. Its robust design and 24V DC power supply suit demanding factory environments, and the device is certified to Safety Performance Level PL e, SIL 3, and Category 4, confirming its use in critical safety circuits.

Key Features of Allen Bradley 440R-D22R2

• Dual Channel Universal Inputs for flexible device compatibility
• Two normally open safety outputs for reliable circuit control
• Single-wire safety connection for easy wiring and expansion
• Optional Ethernet/IP connectivity for integration with standard control systems
• Compact 22mm rail mounting for space-efficient cabinet installation
• Removable screw terminals for convenient maintenance
• Automatic or manual monitored reset options
• High mechanical durability with up to 10,000,000 switching cycles

Technical Specs of 440R-D22R2

• Inputs: 2 dual channel universal inputs (Single Wire Safety or OSSD, 50mA)
• Safety Outputs: 2 normally open (NO) relay outputs, rated 6A 24V DC
• Auxiliary Output: 1 normally closed (NC) solid state
• Power Supply: 24V DC (20.4V min, 26.4V max)
• Safety Performance: PLe, SIL 3, Category 4 (ISO 13849-1, EN/IEC 61508, EN 954-1)
• Operating Temperature: -5°C to 55°C
• Mounting: DIN rail, 22mm width
• Wire Size: 24 AWG (0.205 mm²) min, 12 AWG (3.31 mm²) max
• IP Rating: IP40, IP20 (terminals)
• Certifications: CE, C-UL-US, C-Tick, CCC, S-Mark, TUV

Applications / Use Case

The Allen Bradley 440R-D22R2 is widely used across manufacturing and industrial automation for monitoring and securing safety-critical circuits. Typical applications include monitoring emergency-stop systems, safeguarding machinery exits, and integrating proximity switches into safety logic. The device is often chosen for packaging lines, material handling systems, and assembly operations where safety and uptime are priorities. Its universal inputs allow connection to various safety devices, and the high safety integrity makes it suitable for environments requiring strict compliance with international safety standards. The 440R-D22R2 is ideal for engineers looking to reduce wiring complexity and increase system flexibility without compromising on safety performance.

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