1. This is a Siemens 3TH4394-0AB0 Safety Relay. It is a modular, solid-state safety relay, designed to control safety-related circuits in equipment such as machines or control systems.
2. It is a four-channel design, with four form C contacts per relay. It has dual single-fault input, so it can quickly and reliably detect faults, and it has LED indicators to signal power and trip status.
3. It is UL-listed and CSA-approved and meets a wide range of regulations, including EN 954-1, UL 508, and CSA C22.2 No. 14. It also carries a 3-year manufacturer's warranty, so you can be sure of lasting quality and reliability.