Load Interrupter Switch Replacement Case Study Solution After a thorough investigation of their options, the university selected G&W Electric's PNI style deadfront, maintenance free, SF6 gas insulated switches, with resettable vacuum interrupters for overcurrent protection. While the problems associated with the metal enclosed fused LI switches had always been tolerated and worked around by the university’s operations personnel, the G&W Electric PNI switches eliminated all of these shortcomings. The mechanism used for loadbreak switching in the PNI has been tested to 1,200 loadbreaks of 600 amps with absolutely no maintenance, so it will provide the university with safe and reliable switching for many years to come. Consequently, it is an ideal choice for automatic transfer and distrib

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