In many applications, the environment in which equipment is located is less than perfect. In these situations power supplies can be subjected to adverse operating conditions, making even the most rugged design susceptible to a premature failure.
Dust, contaminants and temporary high humidity can create corrosion or unwanted connections between traces on the PC board. 
Vibration and thermal shock can cause components on the PC board to stress and break. In these conditions, it is always best to use a device that has a conformal coated PC board.
Conformal coating can prevent short circuits and corrosion of components and solder connections, creating a higher level of safety. The protective coating also holds components firmly in place. This prevents components from swaying back and forth in vibration situations, possibly breaking a lead away from the PC board.
Conformal Coating
The protective coating is accomplished by dipping the assembled PC board in an acrylic varnish. The components not allowed to be coated, such as fuses and terminal blocks, are protected by a mask before the dipping process. The coating has no impact on the electrical performance of the power supply, so de-ration of the supply is not necessary.
PULS currently offers seven standard 24VDC models with conformal coating. These units have a variety of output wattages and are offered both in single and three phase.
::Design World::
Filed Under: Materials • advanced, Power supplies, Terminal blocks