Modern railways rely on a continuous flow of electrical power. Even the briefest power interruption can disrupt all sorts of services: emergency and safety systems, signage, ticketing, traffic management systems, power substations, lighting, or signaling. ABB’s UPS products protect these crucial electrical loads from any input power interruption or power-quality disturbance. With a modular, plug-in UPS design and pre-engineered frames that eliminate cabling, you are assured of the best reliability and a continuous flow of clean power. ABB’s modular design, based on DPA™ technology, lets you add or remove modules without powering down, making servicing or capacity expansion easy.