The Comepi MT2A22-024 is a safety relay with integrated time delay functionality, specifically engineered to address a critical safety challenge in industrial machinery: the presence of hazardous motion that persists for a defined period after a stop command has been issued. In applications such as high-speed saws, centrifuges, or injection molding machines, simply cutting power does not immediately eliminate danger—rotating blades may coast, pressure may need to bleed off, or temperature may require time to dissipate. The MT2A22-024 solves this by providing both instantaneous safety outputs to cut power immediately, and delayed safety outputs that remain open for an adjustable 0-30 second period, ensuring that protective guards or access doors remain locked until the hazard has truly subsided.

From a functional safety perspective, the MT2A22-024 is certified to the highest industry standards. It achieves Safety Integrity Level 3 (SIL 3) according to IEC 61508 and EN 62061, and Performance Level e (PL e) according to ISO 13849-1. Notably, the instantaneous outputs are rated for Category 4 architecture, while the delayed outputs meet Category 3 requirements. These certifications are backed by exceptional reliability metrics, including a Mean Time to Dangerous Failure (MTTFd) of 2403 years, an extremely low Probability of Dangerous Failure per Hour (PFHD) of 1.89×10⁻⁹, and a Diagnostic Coverage (DCavg) of 99%. The device utilizes dual-channel input architecture with cross-monitoring and cyclic self-checking to ensure that any internal fault or wiring discrepancy results in an immediate safe state.

Unlike traditional electromechanical safety relays, the MT2A22-024 employs semiconductor OSSD (Output Signal Switching Device) technology for its safety outputs. This provides several distinct advantages: there are no mechanical contacts to wear or weld, switching speeds are faster, and the outputs are inherently potential-free. The device provides two normally open (NO) instantaneous OSSD outputs and two normally open (NO) delayed OSSD outputs, each rated for 24V DC at up to 400mA. The delay time is conveniently adjusted via a front-panel trimmer, eliminating the need for software configuration. The relay can be configured for either manual or automatic start modes, and a dedicated feedback loop allows for monitoring of external contactors or expansion modules. Front-panel LED indicators provide clear visual status of power, input state, and output state, simplifying commissioning and diagnostics.

Installation is straightforward on a standard 35mm DIN rail. The device operates on a 24V DC supply and consumes just 19.1 mA of current, making it highly efficient for control panel integration. Housed in a lightweight (0.065 kg) reinforced thermoplastic enclosure, the MT2A22-024 carries an IP20 protection rating and is designed for operation in ambient temperatures from 0°C to 55°C. It holds CE, cULus, and TÜV certifications. With its combination of adjustable time delay, solid-state OSSD reliability, and high-level safety certification, the Comepi MT2A22-024 is an ideal solution for safeguarding machinery with inherent inertia, including woodworking saws, textile spinning machines, industrial centrifuges, and injection molding equipment.

Technical Specifications