Comparison : Item # SPR3-450NNF, 100 to 240 Volt (V) Alternating Current (AC) Voltage Power Controller
Item # SPR3-450NFF, 100 to 240 Volt (V) Alternating Current (AC) Voltage Power Controller
Item # DPU34A-040N, 440 Volt (V) Supply Voltage Power Controller
Item # DPU32B-070D, 220 Volt (V) Supply Voltage Power Controller
Item # DPU34B-200R, 440 Volt (V) Supply Voltage Power Controller