The IDEC RU42S-D12 is a 4PDT 12V DC plug-in relay designed for versatility and environmental consideration. It features a non-polarized LED indicator, mechanical flag indicator, and snap-on yellow marking plate with additional options available. The relay boasts lead-free construction and cadmium-free contacts, ensuring compliance with current environmental standards. It is UL Recognized, CSA Certified, and EN Compliant, making it suitable for a wide range of applications.