The Desk-Top model GTM1089 and Open-Frame GTM21096 model Switchmode Power Supplies from GlobTek accept Universal Inputs from 90-264Vac 47-63Hz and have Regulated Output ranging from 3.3V to 48V in 0.1V increment up to 0-20W of power with low Ripple. Features include: Class I Protective Ground and Class II Double-Enforced Insulation input configurations, Built-in Protection for O.C., S.C., O.V., OT. External power supplies are housed in a Impact Resistant non-vented Polycarbonate Case with dimensions of 86.5L x 47W x 32H (mm) Desk-Top or 84.6 x 30.7 x 28.9 (mm) Open-Frame/PCB Mount. All designs are Safety Agency Approved or Certified to UL2601/UL60950/UL1310, CSA 22.2 #601/950/223-M91, and TUV EN60601/EN60950 and complies with EMI/EMC Directives and FCC Class B, for Grounded and Non-Grounded, Medical and ITE Applications. All Models carry the UL, cUL, TUV, CE Logos. Stock, Modified and Custom Designs are Available. GlobTek is an ISO 9001:2000 Certified company. Made in USA option available upon request.