Eaton 1220-0012-0002 Current Transformer (CT)

The Eaton 1220-0012-0002 is a high‑accuracy solid‑core current transformer designed for indoor use at voltages up to 600 V. It steps down primary currents up to 200 A to a standard 5 A secondary, enabling safe connection to metering instruments, protection relays, and energy management systems. The transformer’s robust construction and precision winding ensure reliable performance over a long service life.

Key Features

• Primary current: 200 A (fixed ratio)

• Secondary current: 5 A

• Accuracy class: 0.5 (per IEC 61869‑2 / IEEE C57.13)

• Solid‑core design with molded thermoplastic housing

• Built‑in mounting feet for panel or DIN rail

• Terminal covers with captive screws for safety

Technical Specifications

Construction

The core is made of high‑grade grain‑oriented silicon steel, ensuring low phase displacement and high accuracy over a wide current range. Windings are insulated with class E materials and encapsulated in a flame‑retardant UL 94 V‑0 thermoplastic case. Secondary terminals are clearly marked and recessed to prevent accidental contact. The compact footprint allows dense packing in multi‑circuit panels.

Applications

• Digital power meters and submeters

• Protection relays (overcurrent, earth fault)

• Energy management systems in commercial buildings

• Load monitoring in industrial switchboards

• Retrofit of analog ammeters

Installation

The solid‑core design requires the primary conductor to be passed through the window before connection. Mounting can be done via the integrated brackets on a 35 mm DIN rail or directly onto a panel using screws. The CT is suitable for copper or aluminum busbars up to 25 mm width. Secondary wiring must be shorted or connected to a burden before powering up to avoid dangerous open‑circuit voltages.

Accuracy and Linearity

With an accuracy class of 0.5, the 1220-0012-0002 guarantees a ratio error within ±0.5% and phase displacement within ±30 minutes at rated current. This makes it suitable for revenue‑grade metering and precise protection coordination. The transformer maintains linearity up to 120% of rated current, ensuring accurate measurement under normal and overload conditions.

The Eaton 1220-0012-0002 combines affordability with reliable performance, making it a popular choice for electrical contractors, panel builders, and facility managers who need trustworthy current sensing for monitoring and protection.