Allen Bradley Safety Relay 440R-EM4R2D

Main Product Series – Function & Application Comparison

Typical Applications & Industries:
✓ Emergency stop (E-stop) monitoring ✓ Safety gate and interlock switch monitoring
✓ Light curtain and safety mat control ✓ Two-hand control systems
✓ Guard locking and access control ✓ Safe speed monitoring (MSR57)
✓ Machine tool safety circuits ✓ Packaging machinery and robotics

Detailed Description – Allen-Bradley Guardmaster Safety Relay Portfolio

1. Guardmaster 440R Single-Function Safety Relays

The Guardmaster 440R series provides a broad range of safety monitoring relays for single-zone and multi-zone safety applications. These units are designed to meet global functional safety standards such as EN ISO 13849-1 and IEC/EN 62061 .

DI/DIS (Dual Input)
Features two dual-channel inputs and one Single Wire Safety (SWS) input/output. Available with electromechanical relay outputs (DI) or solid-state outputs (DIS). Rotary switch configures auto/manual or monitored manual reset. Universal inputs are compatible with interlocks, light curtains, safety mats, E-stops, and SensaGuard devices .

SI/CI (Single/Compatible Input)
Ideal for safety functions using one dual-channel or single-channel safety device. Universal input terminals accept multiple device types. Includes 2 N.O. safety outputs (SI) or 2 solid-state outputs (CI) plus one solid-state auxiliary output. Perfect for global E-stop functions in combination with other GSR relays .

Key Specifications (440R Series) :

• ✓ Safety Rating: CAT4, PL e, SIL3

• ✓ Power Supply: 24V DC

• ✓ Response Time: 15–30 ms

• ✓ Operating Temperature: -5°C to +55°C

• ✓ Mounting: 35mm DIN rail

• ✓ IP Rating: IP20 (terminals), IP40 (enclosure)

Model Examples:

• 440R-D22R2 – DI Dual Input, 2 N.O. safety outputs, relay 

• 440R-D22S2 – DIS Dual Input, 2 solid-state outputs 

• 440R-S12R2 – SI Single Input, 2 N.O. safety outputs 

• 440R-S13R2 – CI Compatible Input, 2 solid-state outputs 

2. Guardmaster CR30 Software Configurable Safety Relay (440C-CR30)

The Guardmaster 440C-CR30 offers a flexible, cost-effective solution for applications requiring multiple safety circuits. Configurable via Studio 5000 Logix Designer or Connected Components Workbench software .

Key Features:

• ✓ 22-point embedded safety I/O – handles up to 10 dual-channel safety circuits 

• ✓ Predefined function blocks – AND, OR, NAND, NOR, XOR logic functions 

• ✓ Expandable – via two Micro800 plug-in I/O modules 

• ✓ Optional Ethernet/IP – shares information with controller systems 

• ✓ Single Wire Safety (SWS) – cascading with GSR series while maintaining SIL3, PLe 

Typical Applications: Multi-zone safety control, complex safety logic, integration with standard control systems via EtherNet/IP.

3. Bulletin 700S-CF Safety Control Relays

The 700S-CF series provides high-reliability safety control relays for fail-safe circuits. These relays feature mechanically linked contacts per IEC 60947-5-1 Annex L, ensuring system integrity within safety circuits .

Key Features:

• ✓ Mechanically linked contacts – 2 to 12 poles, all mechanically linked 

• ✓ Redundant contacts – independent and redundant internal contacts support the safety function

• ✓ Red faceplate – easy identification of safety circuits 

• ✓ Double-break contacts – reduces probability of welded contacts 

• ✓ Visual indication – contact state visible on front 

• ✓ Tamper-resistant cover – prevents unauthorized changes 

Specifications (700S Series) :

• Contact Rating: 10A @ 600V AC / 5A @ 600V DC

• Mechanical Life: 12.5+ million operations

• Operating Temperature: -20°C to +65°C

• Mounting: Panel mount or 700-MP rail

• Coil Voltage: 24V DC, 110/120V AC, 230V AC

Model Examples:

• 700S-CF440DC – 4 N.O. contacts, 110/120V AC 

• 700S-CF620EJC – 6 N.O. + 2 N.C. contacts, 24V DC 

• 700S-P620A1 – 6 N.O. + 2 N.C. contacts, high-current rating 

• 700S-CF530DC – 5 N.O. + 3 N.C. contacts 

4. Guardmaster MSR Series (MSR126, MSR127, MSR131)

The Minotaur MSR series provides dependable basic fault detection for safety control systems. These 22.5mm relay devices feature independent and redundant internal contacts to help ensure the safety command .

MSR126R/T – Designed for single-channel safety gate, single-channel E-stop, or light curtain with cross fault detection .

MSR127RTP – Versatile relay with three safety contacts and one auxiliary contact. Can be connected in three input configurations: 1 N.C., 2 N.C., or 2 PNP from light curtain .

MSR131RTP – Four input configurations: 1 N.C., 2 N.C., 2 PNP from light curtain, or 4-wire safety mat .

Key Features (MSR Series) :

• ✓ Stop category 0

• ✓ Cross fault monitoring

• ✓ Monitored manual or automatic reset

• ✓ Cat. 4 per EN954-1

• ✓ 2 N.O. (MSR126) or 3 N.O. (MSR127/131) safety contacts

• ✓ Single/dual channel operation

• ✓ Removable terminals for easy wiring

MSR127RTP Specifications :

• Safety Rating: CAT4, PL e, SIL3

• Input Power: 24V AC/DC or 115/230V AC

• Power Consumption: 2W

• Response Time: 15ms

• Safety Outputs: 3 N.O. + 1 N.C. auxiliary

• Mechanical Life: 2,000,000 operations

5. Guardmaster Expansion Modules (EM/EMD)

Expansion modules add additional safety outputs to a GSR system while maintaining SIL3, PLe .

Key Features:

• ✓ Single Wire Safety input

• ✓ Rotary switch configures auto/manual or monitored manual reset 

• ✓ Single Wire Safety output connects to control other safety relays

• ✓ Maintains SIL3, PLe when cascading 

Key Technology Features Across Allen-Bradley Safety Relay Portfolio

Safety Ratings Reference

All Guardmaster safety relays are CE marked, cULus listed, and BG certified