ABB's redundancy units are used to create an operational redundancy scheme that significantly increases the availability of electrical systems. Three different versions are available depending on the output current and power supply: - CP-D RU in MDRC housing - CP-A RUD for effective redundancy setup of two 24 VDC power supplies. current with a maximum output current of 2.5 A per channel - CP-A RU for effective configuration of redundancy of two 24 V DC power supplies. current with a maximum output current of 20 A per channel