SymCom HLM/HLMU Series 3-Phase Voltage Monitoring Relays

The HLMU Series is a universal voltage, encapsulated, 3-phase voltage monitor. It continuously measures the voltage of each of the three phases with microcontroller accuracy and compares the value to preset trip points.

• It separately senses phase eversal and loss, over, under and unbalanced voltages, and over or under frequency.
• Protection is assured during periods of large average voltage fluctuations, or when regenerated voltages are present.
• The unit trips within 200ms when phase loss is detected.
• Adjustable time delays are included to prevent nuisance tripping and short cycling of sensitive equipment.
• The isolated, 10A, DPDT relay contacts trip when a phase voltage exceeds the trip limits for the trip delay.
• Nominal line voltage, voltage unbalance, and time delays are knob adjustable.
• The phase loss setpoint and the acceptable frequency range are fixed.
• Both delta and wye systems can be monitored, no connection to neutral is required.
• Proprietary microcontroller based circuitry: Constant monitoring to protect against phase loss, phase reversal, over, under, and unbalanced voltage, over and under frequency
• Universal line voltage range: Flexibility to work in 200 to 480VAC applications
• DIN rail (35mm) or surface mounting: Installation flexibility
• LED indication: Provides diagnostics of relay, fault and time delay status
• Encapsulated: Protects against shock, vibration, and humidity
• Finger-safe terminal blocks: Meets IEC 61000 safety requirements