AF0100 Arc-Flash Relay
GENERATOR APPLICATION GUIDE
9
Littelfuse.com/ArcFlash
© 2017 Littelfuse Products
ADVANTAGES OF RESISTANCE GROUNDING FOR GENERATORS
SE-330 Series
Neutral-Grounding-Resistor Monito
r
Advanced Neutral-Grounding-Resistor (NGR)
Monitor with data logging and optional
communications.
NGR Series
Neutral-Grounding-Resistor System
Monitoring-ready NGR packages that speed
deployment on site.
EL3100 Series
Ground-Fault and Phase-Voltage Indication
Ground-Fault Monitor for ungrounded generators and
phase-voltage indication for systems up to 600 volts.
NGRM-ENC Series
Neutral-Grounding-Resistor Monitor
Enclosure with SE-325 or SE-330 NGR Monitor and
optional phase voltage, metering, indication and reset.
SE-701 Series
Ground-Fault Monitor
Wide-range ground-fault relay,
especially suitable for rental units.
PGR-4300 Series
Generator Ground-Fault Relay
Generator Ground-Fault Relay for solidly
grounded generators. No CT required.
Generator ground-fault current can be higher than short-circuit current for solidly grounded generators.
High-resistance grounding can eliminate the possibility of phase-to-ground arc flash on the first ground fault.
Continuity of service during a ground fault for applications below 5 kV and with a neutral-grounding resistor (NGR)
limiting current below 10 A.
Reduced mechanical and electrical damage resulting from high-current ground faults.
Eliminate transient overvoltages from ungrounded systems.
Multiple generators can be grounded at a single point using a zig-zag transformer.
SE-704 Series
Earth-Leakage Relay
Earth-Leakage Relay for resistance-
grounded generators.
SE-325 Series
Neutral-Grounding-Resistor Monitor
Standard NGR Monitor, ideal for systems with
let-through currents of 25-A or lower.