Earth Fault Detection Relays
Littelfuse SE701 Series
- Advanced overcurrent and earth fault protection relay
- Designed for using on systems with significant harmonic content
- Adjustable time delay (50 ms-2.5 s) for quick protection and system coordination
Description
The Littelfuse SE-701 is a microprocessor-based earth fault relay for resistance and solidly-earthed systems. It is uniquely suited for use on systems with significant harmonic content in addition to common systems.
The SE-701 earth leakage relay can provide main-plant protection, feeder-level protection, or individual-load protection. Proper current transformer selection provides the desired pickup range. 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 (1-99%)
Trip setting based on input CT primary, allows use with any CT. Minimum 50 mA with EFCT Series.
Output contacts
Form A and Form B earth fault output contacts for operating a separate annunciation and trip circuits.
Analog output (0-5 V)
Allows for connecting an optional meter (PGA-0500) or a control system.
CT-Loop monitoring
Alarms when CT is not connected.
Selectable DFT or peak detection filtering
Compatible with variable-speed drives.
Non-volatile trip memory
Retains trip state while de-energised to simplify troubleshooting.
Microprocessor based
No calibration required, saves on maintenance cost.
Universal power supply
Allows operation in application where one side of PT is faulted. Provides flexibility for numerous applications.
Data Sheets and manuals
SE-701 Data Sheet SE-701 Manual
CAD Drawings and Models
SE-701, 703, 704 3D ModelSE-701 CAD Drawing
IEEE Device Numbers
Earth fault (50G/N, 51G/N)
Trip Level Settings
1-99% CT-Primary Rating
Trip Time Settings
0.05-2.5 s
Contact Operating Mode
Selectable fail-safe or non-fail-safe
Output Contacts
Isolated Form A and Form B
Approvals
C-Tick
Analog Output
0-5 V
Dimensions
H 75 mm; W 55 mm; D 115 mm
Warranty
5 years
Mounting
DIN, Surface (standard) Panel (with PMA-55 or PMA-60 adapter)
