Bypass switches allow you to bypass the UPS for utility power in the event the UPS needs to be serviced or removed. Crest factor ratio: 50% load up to 4.8:1, 75% load up to 3.2:1, 100% load up to 2.4:1. Several switches are offered. Model depicted: SPH 302 and SPD 302 with GFCI plug, circuit breaker and generator plug.