All the below mentioned dual/redundant power product models are by default hot-swappable in nature.
U150EX
U250
U250V
U350
U500
U500EX
U500VX
V750
U1000
U1000X
U1000VX
U1000DX
V1250
U1500
U1500VX
V2000
U2500
U2500VX
U3500
U3500X
U5000
U5000X
U5000HX
U5000VX
U7500
U7500V