Earth Fault Relays
Littelfuse SE704 Series
- Designed for resistance-earthed and solidly-earthed systems
- Sensitive earth fault detection as low as 10 mA
- Save on maintenance as no calibration needed
Description
The Littelfuse SE-704 is a microprocessor-based earth fault relay for resistance-earthed and solidly-earthed systems. It operates on AC solidly earthed and AC resistance earthed systems.
This earth fault protection relay offers very sensitive earth 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.
Note: Littelfuse earth fault protection products may also be known as ground fault products.
We are the exclusive NSW supplier of Littelfuse protection relays and controls for the protection, safe control and distribution of electrical power in industrial applications.
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 earth 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 under voltage breaker coil.
Harmonic filtering
Eliminates nuisance tripping.
Non-volatile trip memory
Retains trip state when de-energised 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.
Data sheets and guides
SE-704 Data SheetSE-704 Manual
CAD Drawings and Models
SE-704 CAD Drawing SE-701, 703, 704 3D Model
IEEE Device Numbers
Earth fault (50G/N, 51G/N)
Input Voltage
See ordering information
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
C-Tick
Analog Output
0-5 V & 0-1 mA
Dimensions
H 75 mm; W 55 mm; D 115 mm
Conformally coated
Optional
Warranty
5 years
Mounting
DIN, Surface (standard) Panel (with PMA-55 or PMA-60 adapter)
