Control Switches International (Csii) is the leading supplier of manual bypass and maintenance bypass switches. We have supplied open and enclosed switches to all the major UPS manufacturers.   Our in-house UPS panel design experience cannot be matched by any other cam switch manufacturer. See us for your critical application, we will custom tailor a system to your specific requirements. If you have a UPS panel, you should consider a maintenance bypass switch that will allow you to safely and completely service the UPS while keeping your critical load on-line.