Power Supplies are controlled remotely.
Press Release Summary:

Original Press Release:
300 Watt, Low Cost, Zero-Up Programmable Switchers From Kepco
Kepco is pleased to announce the addition of 300 Watt modules to its RKW series of single output, low cost, low noise power supplies. The RKW series features a remote on-off, remote voltage control from zero to maximum rated output voltage and a current balance terminal for easy parallel operation. Single d-c outputs from 3.3 to 48 Volts are provided from any a-c mains (85 to 264 V a-c ) with active power factor correction (PFC). Conducted and radiated emissions are suppressed to FCC Class B, EN 55011-B and EN 55022-B limits with no external filtering required.
The RKW 300 Watt units measure 92 mm x 80 mm x 175 mm (3.62" x 3.15" x 6.89") and weigh only 1.8 Kg. (3.96 lbs. )
PRICE: $199.00 ea. in 100 piece quantities
AVAILABILITY: Stock to 6 weeks