Transformer Technologies 140-501 Current Transformer

The Transformer Technologies 140-501 current transformer is an instrument current transformer that reduces high primary current to a standardized 500:5 A secondary for metering and protective relaying, providing electrical isolation from high-current circuits in power systems. This window-type unit mounts around the conductor with an 8.13 in (206.5 mm) window diameter and is designed for use in switchgear, motor control centers, power distribution panels, substations, and industrial electrical systems requiring accurate current measurement. It operates 50–400 Hz, supports up to 600 V, and features a 10 kV basic insulation level (BIL) with a C20 relay class and ANSI metering class from 0.3B0.1 to 1.2B1.8, plus a continuous thermal rating of 2.0 at 30°C and 2.0 at 55°C. Weighing about 20.6 lb (9.34 kg), the transformer is compatible with power meters, protective relays, switchgear, and electrical distribution panels, and is a commonly listed replacement for ABB 500:5, GE Grid Solutions 140-501, and Eaton 500:5 current transformers.