The E3RA-RP21 is an advanced, digital safety relay from Omron. It is a high-performance safety relay with a fast response time and built-in protection features. The relay features two-channel operation, allowing the user to control two circuits or two machines at the same time. It also offers two types of monitoring functions (EN60947-5-1 and EN60947-5-2) and two LED indicators to show the status of the relay. Additionally, the E3RA-RP21 has extended operating temperatures, a range of input/output voltages and an automatic start/stop feature.