UVT is a device which makes ACB tripped automatically to prevent the accident on load side due to under volrage or power breakdown. Difference between Shunt Trip and UVT? usmanafzal (Electrical). UVT is an internal accessory which trips a circuit breaker in the case that circuit voltage decrease. New to QuoteFast? Getting Started at a Glance. UVT Based in Taiwan, Shihlin Electric is a Under Voltage Trip | electrical system and electrical equipment supplier since 1955. This Electrical Device operates by momentary energisation and opens the " Switching Device / Circuit Breaker" by activating the Mechanical.