The SSR-40DA Solid State Relay Module is a reliable switching solution designed for industrial and automation applications. This 4-pack set features advanced solid-state technology with no moving parts, ensuring exceptional durability and an extended service life compared to traditional electromechanical relays. Each module accepts a wide DC control voltage range of 3-32V DC on the input side, making it compatible with various control systems including PLCs, microcontrollers, and logic circuits. The output side handles loads from 5-60V DC with an impressive current capacity of up to 40A, suitable for controlling motors, heaters, lighting systems, and other high-power DC devices. The optical isolation design provides crucial protection between control and load circuits, enhancing safety and preventing electrical interference. The compact, space-saving design features clearly labeled terminals for straightforward wiring and installation. With CE certification, these modules meet international quality standards for professional use in temperature control systems, industrial automation, and power management applications.