ABB 2TLA010051R0100 Safety Relay Module Unit

ABB 2TLA010051R0100 Safety Relay Module Unit is the SENTRY SSR20M safety relay, delivering three normally open and one normally closed relay outputs for robust safety control in industrial automation. It accepts a wide supply range of 85–265 VAC or 120–375 VDC and operates with no time delay, classifying it as a non-delayed safety relay suitable for fast interlock applications. As part of ABB's SENTRY line, SSR20M devices are designed for safety circuits such as two-hand control devices, emergency-stop interlocks, and safety gates, helping to ensure fail-safe shutdowns when a safety condition is released. The 2TLA010051R0100 variant is the VAC/VDC version of the SSR20M family, differentiating it from the 24 VDC-only models, and is used in systems requiring versatile cross-compatibility with both AC and DC safety circuits. The unit's three NO contacts provide normally open switching paths while the single NC contact provides a normally closed path for monitoring interlocks and ensuring circuit integrity in fail-safe configurations.