AC Load Banks

AC Load Banks

AC load banks are test systems that apply a known electrical load to generators, UPS systems, inverters, alternators, and other AC power sources. Resistive load banks simulate real-power demand, while combined resistive/reactive configurations can be used where power factor and reactive loading also need to be evaluated. A typical unit contains load elements, switching stages, a cooling arrangement, instruments, controls, and electrical protection. Selection must consider single- or three-phase operation, voltage, frequency, kW, power factor if applicable, step size, continuous rating, site altitude and ambient temperature, and available ventilation. The load bank should be integrated into a test procedure that defines acceptance criteria and safe connection/disconnection steps. Exhaust air can be very hot, so placement and clearance are important.