Littelfuse, Inc. Monitor - Relay Output 455480R

The 455480R is a three-phase voltage monitor designed for high-voltage applications up to 480 V ac, featuring line and load side monitoring for continuous motor protection. It automatically selects the 400 V range and includes a pilot duty relay rating of 470 VA at 600 V ac. The unit operates on 50/60 Hz, with adjustable low and high voltage trip points, a 2-30 second trip delay, and a 2-300 second restart delay. Voltage unbalance detection is adjustable from 2% to 8%. Its circuitry is powered via line side connections, eliminating the need for external control power. The device has an infrared LED for communication with the Informer-MS diagnostic tool, and is rated for operation from -40°C to 70°C. It mounts with #8 screws and measures 74.4 mm H × 133.9 mm W × 74.9 mm D. Compliance includes UL 508, CSA C22.2 No. 14, and IEC 60947-6-2.