Valcom VP-2124D The VP-2124D is a fully regulated -24VDC, 2 Amp, power supply. The primary is protected by a fuse; the 2 Amp output is electronically protected. The output is floating with respect to ground. The regulator will maintain -24 Volts +/- 2 Volts over the rated range of input voltages and output loads. Short circuit protection is provided.