CCR2004-16G-2S+, CRS510-8XS-2XQ-IN+ and CRS504-4XQ-IN units come with two hot-swap dual redundant power supplies. If one of them goes out of order at some point, the other one will take over. Then you can use this kit to replace the old power supply – and you don’t even have to restart the router!
Vendor Homepage: mikrotik.com/product/g1040a_60wf
Name: NET ACC PSU 12V 60W/G1040A-60WF MIKROTIK
Category Code: NCC
Product Type: Power Supply
PSU Output Power: 60
Power supply requirements: 12 V - 5 A (total DC output: 60W)