The 3RT1916-4KA1 is an electronic interface module manufactured by Siemens. It is a three-phase contactor interface module that features an emergency stop relay, a fault relay, and a positive opening safe outputs. It is suitable for DIN-rail mounting and is designed for starting, stopping, and reversing of single and three-phase motors. The 3RT1916-4KA1 has a three-pole structure with two normally open and two normally closed contact elements, and a low power switching voltage of 50 V/AC. It also has a high operational reliability due to its two galvanically isolated channels, and its triple contact system guarantees a reliable switching operation. The 3RT1916-4KA1 is suitable for both direct and backward-feeding applications.