Siemens 6EP4437-8FB00-0CY0 SITOP SEL1600 4x10 A expansion module. Siemens 6EP4437-8FB00-0CY0 is the exact SITOP SEL1600 four-channel selectivity expansion module for 24 V DC systems. It accepts a 24 V DC / 40 A input and supplies four individually adjustable 24 V DC outputs, each configurable from 0.5 to 10 A. The listed module includes connection set 6EP4990-8KK00-0XU0 and supports coordinated protection of connected 24 V loads.