What you need is a 24VDC power supply. Selecting the proper power supply requires that you know the following:
-- the current required by the device to be powered
-- the available supply (mains) voltage
Environmental and mounting/installation considerations are also important. You will generally find that switcher-type power supplies are less expensive than linear supplies with comparable current ratings.
Post back with your current requirements and the local supply voltage and we can steer you towards a suitable PSU.