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Allen Bradley Guardmaster Safety Relays MSR121RT

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MSR121RT

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The MSR121RT is a safety control relay from Allen Bradley's Guardmaster Safety Relays series, designed specifically for safety monitoring applications. Operating on a rated voltage of 24 V in both AC and DC configurations, it effectively manages safety mechanisms in industrial environments.

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2 Year DO Supply Warranty
Not an Authorized Distributor: DO Supply is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All of our products come with DO Supply's 2-year warranty.
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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for MSR121RT

ManufacturerAllen Bradley
Product TypeSafety Control Relay
Product LineGuardmaster Safety Relays
Part NumberMSR121RT
Weight0.81 lbs (0.37 kg)
FunctionSafety Monitoring Relay
Rated Voltage (AC)24 V AC
Rated Voltage (DC)24 V DC
Output Configuration3 × normally-open (NO)
Rated Current (AC)6.0 A
Rated Current (DC)6.0 A
Max. Operating Humidity80% (Non-Condensing)
Max. Storage Humidity80% (Non-Condensing)
Max. Operating Altitude1000 MSL
Min. Operating Temperature0 °C
Max. Operating Temperature40 °C
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The Allen Bradley MSR121RT functions as a highly capable safety control relay tailored for monitoring crucial safety operations. This device operates efficiently at 24 V AC or DC, delivering steady performance in various industrial contexts.

With three normally-open (NO) outputs, the MSR121RT is engineered to support safety mechanisms effectively. Its rated current stands at 6.0 A for both AC and DC applications, facilitating dependable circuit operation. This relay’s design allows it to be utilized in demanding environments, where operational parameters must be closely monitored.

The operational environment for the MSR121RT is defined by temperature restrictions, functioning within a range from 0 °C to 40 °C. In terms of humidity, it can withstand conditions of up to 80% without condensation, both during operation and while being stored. Additionally, the relay can be installed at altitudes reaching 1000 meters above sea level, ensuring versatility across different geographical installations. The MSR121RT is an integral component within any safety control system, providing peace of mind through rigorous monitoring and control.