The Pelco MCS16-20B supplies 24-28 VAC power for up to sixteen standard CCD cameras, up to sixteen indoor Pelco Spectra (25 VA) systems and up to six Esprit (70 VA) pan and tilt cameras. The extra four volts on each output compensates for long cable runs. A built-in circuit breaker system protects the unit from power overload and self resets after the fault is corrected.