HRN-57

• It serves to monitor voltage in a switchboard, protection of devices in 3-phase main.
• It monitors value of voltage in 3-phase main.
• It is possible to set upper and lower level independently.
• Adjustable time delay eliminated short voltage peaks and failures in the main.
• Relay doesn’t monitor phase sequence.
• HRN-57: supply from all phases, means that relay is functional also in case of failure in one phase.
• HRN-57N : supply L1, L2, L3-N, means that relay monitors also failure of neutral wire.

Technical parameters

• Phase failure: Yes
• Phase sequence: x
• Overvoltage: Yes
• Undervoltage: Yes
• Asymmetry: x
• Monitored range: AC 3 x 300-500 V
• Supply voltage: 1x CO, 8 A
• Housing: 1-MODULE
• Power supply: from monitored voltage
• Dimensions: 90 x 17.6 x 64 mm (3.5˝ x 0.7˝ x 2.5˝)