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Figure 5: The abrupt switch of the MOV from high impedance to low impedance when a transient voltage occurs clamps that voltage to an acceptable level. (Image source: Littelfuse, Inc.) MOVs are offered in a variety of packages such as the 390 volt, 1.75 kiloampere (kA)V07E250PL2T, which...
“Managed +28V”in this case means the 28V is supplied by a PSU with automatic switch over to batteries in case of mains power failure. “Switched +28V”is the controllable power into each POE injector. We connect it to the POE injector using a standard jack lead (see below) and some...