Manufacturer Astron Model # LSRM-18A-BB Product Description 18 Amp Power Supply w/Battery Back Up Input Voltage (VAC) 115 Volts AC Output Voltage (VDC) 28 Volts DC (Adjustable from 22.0-32.0 Volts DC) Amperage (Cont.) 12 Amperage (Intermittent) 18 Description Solid State electronically regulated. Feature fold-back current limiting to protect the power supply from excessive current or shorted output. Chassis mounted fuse. Less than 5 mv ripple peak to peak (full load and low line).Includes battery back up and trickle charger.Features include: Solid state electronically regulated Fold-back current limiting protects power supply from excessive current and continuous shorted output Crowbar over voltage protection on all models except RS-3L, RS-4L and RS-5L Maintain regulation and low ripple at low line input voltage Heavy duty heat sink Three conductor power cord All metered units feature backlit meters Ripple Voltage 5 mV Fold-Back Protection Yes Crowbar Protection No Dimensions (Width x Height x Depth) inches 19 x 5.25 x 12.5 Product Narrative Astron linear power supplies are heavy duty and solid state electronically regulated. Warranty 1 yr