440R-S845AER-NNL
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Overview of Allen Bradley 440R-S845AER-NNL
The Allen Bradley 440R-S845AER-NNL is a specialty safety relay designed for speed monitoring applications. Also known as the Guardmaster MSR57P, this device ensures safe speed and standstill monitoring in industrial settings. It is powered by 24V DC and includes a combination of normally closed and normally open inputs and outputs tailored for safety circuit control. The relay incorporates advanced features such as solid-state safety and auxiliary outputs, offering reliable and flexible safety switching solutions. Its compact housing and removable terminals facilitate easy installation and maintenance, making it a practical choice for machine safety and industrial automation control systems.Key Features of Allen Bradley 440R-S845AER-NNL
- Speed monitoring relay with safe speed and standstill functionality.
- Powered by 24V DC supply for industrial reliability.
- Inputs: 5 x 1 Normally Closed, 2 Normally Closed LC, plus 1 Normally Open and 1 Normally Closed for flexible control.
- Safety outputs include 6 Normally Open solid-state contacts to meet high safety standards.
- 4 Normally Open solid-state auxiliary outputs for monitoring and signaling.
- Supports automatic/manual or manual monitored reset for operational flexibility.
- Compact dimensions: 67.5 mm width, 99 mm height, 114.5 mm depth.
- Designed with removable terminals for easier wiring and replacement.
- Complies with recognized safety standards including TUV PLe and SIL3 certifications.
Technical Specs of 440R-S845AER-NNL
| Specification | Details |
|---|---|
| Power Supply | 24 V DC |
| Safety Outputs | 6 x Normally Open Solid State |
| Auxiliary Outputs | 4 x Normally Open Solid State |
| Inputs | 5 x 1 Normally Closed, 2 Normally Closed LC, 1 Normally Open + 1 Normally Closed |
| Reset Type | Automatic/Manual or Manual Monitored |
| Dimensions (W x H x D) | 67.5 mm x 99 mm x 114.5 mm |
| Weight | 0.335 kg |
| Certifications | TUV PLe, SIL3, C-UL-US |
| IP Rating | IP40 body / IP20 terminals |
Applications / Use Case
The Allen Bradley 440R-S845AER-NNL safety relay is ideal for monitoring machine speed to ensure safety during operation and standstill conditions. It is extensively used in safety-critical industrial applications including conveyor systems, packaging machinery, and automated manufacturing lines where precise speed supervision is essential. The device protects personnel and equipment by interrupting processes when unsafe speed levels are detected. Its solid-state outputs and multiple input configurations make it suitable for integrating with complex safety control systems conforming to international standards. The relay's versatility allows engineers to implement reliable speed monitoring in a wide range of industrial automation environments.Related Resources
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