ALLEN-BRADLEY MSR117T Guard Master Safety Relay

( Brand: Allen-bradley ), ( Manufacturer Part Number: MSR117T ), ( Type: Safety Relay )

Review ALLEN BRADLEY Guard Master Safety Relay

The **Allen-Bradley MSR117T GuardMaster Safety Relay** is a high-performance, compact yet robust solution designed to enhance industrial safety systems by integrating seamlessly into machine guarding and emergency stop circuits. Engineered with precision for reliability, this safety relay operates as a critical component in safeguarding personnel and equipment in manufacturing, automation, and process control environments. Its advanced architecture combines modular flexibility with robust protection features, ensuring compliance with stringent safety standards such as ISO 13849, EN 954-1, and IEC 62061. The MSR117T is specifically tailored for applications requiring fail-safe functionality, offering a dual-channel design that guarantees fail-to-safe behavior in the event of component failure, thereby minimizing risks associated with equipment malfunctions or human error.

At the heart of the MSR117T lies a sophisticated **GuardMaster** logic platform, which allows for customizable safety logic programming through intuitive software tools. This capability enables engineers to configure complex safety functions, such as two-hand controls, light curtains, and safety mats, with ease while maintaining full traceability and documentation compliance. The relay s compact footprint, measuring just **117 mm in width**, makes it ideal for space-constrained control panels, yet its robust construction ensures durability in harsh industrial environments, withstanding temperature fluctuations, vibration, and electromagnetic interference. The device supports a wide range of input and output options, including **TTL, PNP/NPN, and relay outputs**, providing versatility for integration with various sensors, actuators, and PLCs.

One of the standout features of the MSR117T is its **diagnostic capabilities**, which include real-time monitoring of circuit integrity, fault detection, and self-diagnostic tests. These features not only enhance operational safety but also facilitate predictive maintenance by alerting operators to potential issues before they escalate. The relay s **fail-safe design** ensures that in the event of a power loss or hardware failure, it defaults to a predefined safe state, thereby preventing unintended machine activation. Additionally, the MSR111T is compatible with **Allen-Bradley s Safety Logic Manager (SLM) software**, enabling seamless configuration, testing, and validation of safety functions directly within a familiar engineering environment.

Beyond its technical specifications, the MSR117T embodies a commitment to **safety by design**, aligning with global regulatory requirements while offering peace of mind to operators and plant managers. Its integration with **Allen-Bradley s broader safety ecosystem**, including the Safety Logic Manager and GuardMaster family of products, ensures a cohesive and scalable safety solution for complex automation systems. Whether deployed in a high-speed packaging line, a CNC machining center, or a chemical processing plant, the MSR117T serves as a dependable guardian, balancing performance, flexibility, and safety to protect both human workers and critical assets.

### Pros and Cons of buying a Allen-Bradley MSR117T GuardMaster Safety Relay

The **Allen-Bradley MSR117T GuardMaster Safety Relay** is a critical component in safety-critical control systems, particularly in industrial automation where machine safety is paramount. Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros**

1. **High Reliability and Safety Certification**

The MSR117T is designed to meet stringent safety standards, including **EN ISO 13849-1 (Category 3, PL d)** and **IEC 61508 (SIL 2)**. This ensures it can be integrated into safety-rated systems without compromising compliance, reducing the risk of catastrophic failures or worker injuries.

2. **Modular and Flexible Design**

The relay supports multiple safety functions, including **emergency stop (ES), door monitoring, and safety light curtains**, making it adaptable to various machine safety applications. It can be configured for different safety channels, allowing for scalable solutions as requirements evolve.

3. **Diagnostic Capabilities**

The MSR117T provides **diagnostic outputs and fault reporting**, such as **Safety Output (SO) and Diagnostic Output (DO)**, which help in troubleshooting and maintaining system integrity. This reduces downtime by alerting operators to potential issues before they escalate.

4. **Compatibility with Allen-Bradley and Third-Party Systems**

It integrates seamlessly with **Rockwell Automation s ControlLogix, CompactLogix, and Studio 5000** platforms, as well as other PLCs and safety controllers via **PROFIsafe, DeviceNet, or Ethernet/IP**. This flexibility ensures it can be retrofitted into existing systems or used in new installations.

5. **Long-Term Availability and Support**

As part of Allen-Bradley s legacy product line, the MSR117T benefits from **extended support, spare parts availability, and documentation**. This is particularly valuable for older or legacy systems where newer alternatives may not be as widely supported.

6. **Reduced Wiring Complexity**

The relay simplifies wiring by consolidating multiple safety functions into a single unit, reducing cable clutter and potential points of failure. This also lowers installation time and costs.

7. **Compliance with Global Standards**

Beyond EN ISO and IEC standards, it adheres to **UL, CSA, and other regional certifications**, making it suitable for international applications without additional modifications.

8. **Cost-Effective for High-Safety Applications**

While not the cheapest option, its **reliability and safety certifications justify its cost** in applications where human safety is directly at risk. It can prevent costly downtime or legal liabilities associated with safety failures.

---

### **Cons**

1. **Limited Modern Connectivity Options**

The MSR117T lacks **built-in Ethernet or advanced digital communication protocols** beyond traditional fieldbus options (e.g., DeviceNet, PROFIBUS). This can be a drawback in modern **Industry 4.0 or smart factory** setups where wireless or high-speed digital diagnostics are preferred.

2. **Deprecated Technology**

As a **legacy product**, it may not support the latest **software tools or firmware updates** from Rockwell Automation. Newer Allen-Bradley safety relays (e.g., **Kinetix or GuardLogix**) offer more advanced features, which could limit future-proofing.

3. **Higher Initial Cost Compared to Simpler Relays**

For applications requiring only basic safety functions (e.g., simple emergency stop), a **non-certified relay or a lower-tier safety device** might suffice at a fraction of the cost. The MSR117T s premium is justified only for **high-safety applications**.

4. **Physical Size and Installation Constraints**

The relay is **larger than some modern safety relays**, which may pose challenges in **space-constrained control panels**. This could require additional panel modifications or custom mounting solutions.

5. **Learning Curve for Configuration**

Due to its **complexity and multiple safety channels**, configuring the MSR117T correctly requires **experience with safety standards and Allen-Bradley software (e.g., RSLogix or Studio 5000)**. Misconfigurations could lead to **false safety failures or non-compliance**.

6. **Dependence on Allen-Bradley Ecosystem**

If the system relies heavily on **Rockwell Automation products**, switching to a third-party safety relay (e.g., **Siemens, Phoenix Contact, or Omron**) could introduce compatibility issues. This lock-in effect may limit flexibility in mixed-vendor environments.

7. **Limited Support for Advanced Safety Features**

- **Wireless safety communication (e.g., WLAN-based safety signals)**

- **Built-in HMI integration for real-time monitoring**

- **Machine learning-based predictive diagnostics**

- **Cloud connectivity for remote safety management**

These features are increasingly important in modern industrial safety systems.

8. **Potential for Obsolescence**

While still supported, the **lack of active development** means it may eventually be **discontinued or replaced by newer models**. This could lead to **supply chain risks** in the long term, especially if spare parts become harder to obtain.

---

### **Conclusion**

The **Allen-Bradley MSR117T GuardMaster Safety Relay** is a **highly reliable and certified safety device** ideal for **legacy or high-safety industrial applications** where compliance with **EN ISO 13849 and IEC 61508** is non-negotiable. Its **modularity, diagnostic capabilities, and compatibility with Allen-Bradley systems** make it a strong choice for **machine safety in manufacturing, packaging, or material handling**.

However, its **legacy status, limited modern connectivity, and higher cost** may not justify its use in **simpler safety applications or cutting-edge Industry 4.0 setups**. For **new installations or applications requiring advanced safety features**, newer alternatives (e.g., **GuardLogix, Kinetix, or third-party safety relays**) may offer better long-term value.

---

### **Recommendation**

- You are maintaining or upgrading a **legacy Allen-Bradley safety system**.

- Your application requires **high-safety certification (SIL 2, PL d)** and cannot be met by simpler relays.

- You need a **reliable, field-proven solution** with strong diagnostic support.

- Your system is **already integrated with Rockwell Automation PLCs** (ControlLogix, CompactLogix).

- You are starting a **new project** and can afford a **more modern safety relay** (e.g., **GuardLogix, Siemens S7-1500T, or Phoenix Contact safety relays**).

- Your application requires **wireless safety, cloud connectivity, or advanced diagnostics**.

- You are working in a **mixed-vendor environment** where third-party compatibility is critical.

- Cost is a major concern, and a **simpler, non-certified relay** (with proper safeguarding) could suffice.

For **most new installations**, evaluating **newer Allen-Bradley safety controllers or third-party options** may provide better **scalability, future-proofing, and cost efficiency**. However, for **existing systems where the MSR117T is already in use or required for compliance**, it remains a **sound and dependable choice**.

Details:

part #: msr117t prices

• $99.99-$506.25

specifications automationjack:

• brand: Allen-bradley
• mpn: Msr117t
• type: Safety Relay

seller automationjack:

• city: Bensenville, Illinois
• rating: 98.7%
• # reviews: 2555

payments automationjack:

• credit card: Diners-club
• other
• wallet: Google-pay

general automationjack:

• condition: Used
• Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment

offer automationjack:

• options: Ship-to-home
• started: April 25, 2026
• availability: In Stock
• quantity: 1
• sold: 0

returns automationjack:

• policy: Returns Accepted
• time: 14 Days
• method: Money back
• paid by: Buyer

shipping automationjack:

• class: Economy
• type: Fixed
• transit: 3-6 Days
• service: Economy
• cost: $0.00

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