SE-704 Series

Earth-Leakage Relay

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The SE-704 is a microprocessor-based ground-fault relay for resistanceand solidly-grounded systems. It offers very sensitive ground-fault detection as low as 10 mA and can be used on systems with significant harmonic content. The SE-704 provides feeder-level protection or individual-load protection. The output contacts can be connected for use in protective tripping circuits or in alarm indication circuits. The analog output can be used with a PLC or a meter.

Features & Benefits

  • Adjustable pickup (10 mA-5 A)

    Adjustable trip setting provides a wide range of low-level protection and system coordination

  • Adjustable time delay (30 ms-2.0 s)

    Adjustable trip delay allows quick protection and system coordination

  • Output contacts

    Form A and Form B ground-fault output contacts for operation of separate annunciation and trip circuits

  • Analog output (0-5 V & 0-1 mA)

    Allows for connecting an optional meter (PGA-0500) or control system

  • CT-Loop monitoring

    Alarms when CT is not connected

  • Selectable contact operating mode

    Selectable fail-safe or non-fail-safe operating modes allows connection to shunt or undervoltage breaker coil

  • Harmonic filtering

    Eliminates nuisance tripping

  • Non-volatile trip memory

    Retains trip state when de-energized to simplify troubleshooting

  • Microprocessor based

    No calibration required saves maintenance cost

  • Universal power supply

    Allows operation in application where one side of PT is faulted, provides flexibility for numerous applications

SE-704 Datasheet

SE-704 Manual

TN CT-01 Ground Fault CT Selection Guide


  • IEEE Device Numbers: Ground fault (50G/N, 51G/N)
  • Input Voltage: See ordering information
  • Dimensions: H 75 mm (3.0"); W 55 mm (2.2"); D 115 mm (4.5")
  • Trip Level Settings: 10 mA-5.0 A
  • Trip Time Settings: 30-2000 ms
  • Contact Operating Mode: Selectable fail-safe or non-fail-safe
  • Harmonic Filtering: Standard feature
  • Test Button: Standard feature
  • Reset Button: Standard feature
  • CT-Loop Monitoring: Standard feature
  • Output Contacts: Isolated Form A and Form B
  • Approvals: UL Listed (E340889), CSA, CE (European Union) C-Tick (Australian)
  • Analog Output: 0-5 V & 0-1 mA
  • Conformally coated: Optional
  • Warranty: 5 years
  • Mounting: DIN, Surface (standard) Panel (with PMA-55 or PMA-60 adapter) 

Ordering Information

120/240 VAC/VDC
12/24 VDC
48 VDC
24 VAC

SE-CS30 Series
PMA-55, PMA-60


SE-CS30 Series Ground-Fault Transformer
Required zero-sequence current transformer specifically designed for low level detection. Flux conditioner is included to prevent saturation.

PGA-0500 Analog % Current Meter
Optional panel-mounted analog meter displays ground fault current as a percentage of the set-point or 5 A.