Fuji Electric 4NK0ALY-TK-ONY Thermal Overload Relay

Fuji Electric 4NK0ALY-TK-ONY Thermal Overload Relay is a protective device from Fuji Electric, identified by the part number 4NK0ALY-TK-ONY. It represents a member of the 4NK0ALY family and uses the TK-ONY variant designation, specifying a particular configuration within this line. As a thermal overload relay, it is designed to sense excessive temperature in protected circuits and contribute to overheat protection in electrical control panels and motor starter assemblies. This model's designation—4NK0ALY-TK-ONY—helps technicians identify the exact configuration when selecting replacements or integrating into Fuji Electric protection schemes. When installed in appropriate control circuits, this relay can help prevent damage to motors and other equipment by responding to elevated thermal conditions, supporting safer and more reliable operation in industrial settings.