Allen‑Bradley MSR127T Relay | Safety, Monitoring, 2-Hand Control, 24V DC, DIN Rail, Cat. 4

Allen‑Bradley MSR127T Relay | Safety, Monitoring, 2-Hand Control, 24V DC, DIN Rail, Cat. 4

Allen‑Bradley MSR127T specifications. Safety monitoring relay for 2-hand control stations, 24V DC, DIN rail, Cat. 4/SIL3, with reset.

Product Overview

The Allen‑Bradley MSR127T is a safety monitoring relay designed for evaluating and monitoring 2-hand control stations. It ensures that a machine cycle can only be initiated when two separate push buttons are activated simultaneously within a specific time window, requiring continuous actuation. The relay provides forced-guided contacts for safety outputs and meets high safety standards (Category 4, PL e, SIL 3), making it a key component for operator safety on presses, shears, and other hazardous machinery.

Technical Specifications (Relay)

Technical Specifications (Electrical/Mechanical)

Key Features

• 2-Hand Control Monitoring:​ Ensures safe, simultaneous two-hand operation

• High Safety Integrity:​ Meets Category 4, PL e, SIL 3 for critical safety functions

• Forced-Guided Contacts:​ Prevents contact welding and ensures safe state

• Time Window Monitoring:​ Detects non-simultaneous or early button release

• Manual Reset:​ Requires deliberate reset after activation or fault

• Diagnostic LED:​ Indicates power, fault, and output status

• Compact DIN Rail Design:​ Saves space in control panels

• Robust Construction:​ For industrial safety applications

Applications

• Safety on presses, stamping machines, and shears

• Robot teaching and maintenance stations

• Any machinery requiring a safeguarded 2-hand initiation

• Applications where operator's hands must be kept away from the danger zone during cycle start