Littelfuse, Inc. Monitor - Relay Output 50R400

The 50R400 is a single-phase voltage monitor designed to protect motors in applications such as compressors, air conditioners, and pumps by detecting low-voltage conditions. It operates on 380-480 V ac at 50/60 Hz and features a SPDT relay with a pilot duty rating of 470 VA at 600 V ac. The device trips at 90% of setpoint and resets at 93%, with fixed trip and restart delays of 4 seconds and 2 seconds respectively. It has an operating temperature range of -20°C to 70°C, is rated for 10-95% non-condensing humidity, and complies with UL 508 and IEC 60947-6-2. The unit mounts with #8 screws and measures 74.4 mm high, 133.9 mm wide, and 74.9 mm deep.