Cutler-Hammer 0121A00540-13 Current Transformer converts high primary current to a 5 A secondary, with a 400:5 (primary:secondary) ratio. It is rated for 50–400 Hz operation and up to 600 V, making it suitable for AC power-system measurement and protection tasks. Typically used to feed meters or protective relays in electrical distribution networks, providing a safe, isolated indication of current flow.
