The heating element must be 12V and consume an average of 2.5 amps. The extruder has a heating element (heater cartridge) in the heating block that connects to the screw terminal labeled D10. When shopping for a heatbed consider a 120W/12V option that is well within the parameters or a traditional RAMPS 1.4 board. The FET (fuses) on the boards together with the mosfets are the first candidates to burn out if your heatbed draws more power that the supported rating. The heatbed should be inside the operating parameters of these two.
Second is the actually amperage that your PSU can deliver. Many RAMPS clones use MOSFET that are not rated for 11A or even the average 8A you will see on a 12V heatbed. Your theatrical limit is 11A at 120V that's about 120W that a heater can consume, if you get a heater that draws more power it will kill your MOSFETs. The first consideration is the MOSFET of your board. There are many factors when considering if a heatbed will work with your RAMPS board or if your heatbed will destroy your board. This board is mainly a 12V board and can be modified to work at 24V. This does add another set of steps to assembly, but we stuck with larger sizes to make it fairly painless. In RAMPS 1.4, the resistors and capacitors are now surface mount to fit more passive components. In RAMPS 1.4 the capacitors and resistors are now surface mount (SMD) which provided more space for other passive components and headers. 6 Hacking (archived information and notes).5.3.1 Other production boards found in the wild.5.1 The Heat Bed Mosfet gets TOO HOT!!!.2.7.2 Power Supply, Details and Considerations.2.7.1.1 Power for the Arduino Mega board.
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