Littelfuse PGR-3200 User Manual
Protection Relays & Controls
Ground-Fault Protection – Ungrounded AC System
PGR-3200 SERIES
Ground-Fault Protection System
Description
The PGR-3200 detects ground faults by continuously
monitoring the insulation integrity of ungrounded electrical
systems. The relay monitors the insulation for damage and
assists with predictive maintenance and troubleshooting of
developing ground faults by providing two warning and an
alarm level. The PGR-3200 operates on one- or three-phase
ungrounded systems up to 6 kV.
The PGR-3200 can also be used on a grounded system to
monitor the insulation for damage, while the power system
is de-energized. The mode-of-operation terminals (27-28)
are connected to the circuit breaker or contactor auxiliary
contacts to toggle the relay off when the contactor or breaker
is closed.
Simplified Circuit Diagram
A
B
C
A
PGR-3200
L1
(Ground-Fault
Protection System)
L2
Ordering Information
ORDERING NUMBER CONTROL POWER
PGR-3200
PGR-3200-120
ACCESSORIES REQUIREMENT
PGH Series Required >1,300 V
PGA-0510 Optional
Note: Fo r optio nal conformal coating please consu lt factory. To convert to a res istance
grounded system, see neutral-grounding-resistors packages.
240 Vac
120 Vac
Features & Benefits
FEATURES BENEFITS
Meets National Electrical Code (NEC
NEC® and CEC Code
compliant
Output contact
(50 k
Ω
)
Output contact
Ω
)
(10 k
Analog output
(0 - 1 mA)
DIN-rail or surface
mount
250.21(B) and Canadian Electrical Code Part 1,
Section 10-106 (2) requirements for ungrounded
systems
Form C output contact for alarming when the
insulation resistance is below 50 k
Form C output contact for tripping when the
insulation resistance is below 10 k
Provides means for connecting to an optional
meter (PGA-0510) or control system
Flexible options for ease of installation
Ω
Ω
®
) Article
Accessories
A
PGH Series High-Tension Coupler
A PGH Series high-tension coupler is required
for systems between 1,300 V and 6,000 V.
PGA-0510 Analog Ohm Meter
Optional PGA-0510 Analog Meter allows
for metering of insulation resistance.
Specifications
IEEE Device Numbers Undervoltage Relay (27)
Ground Detector Relay (64)
Input Voltage
Dimensions H 75 mm (3”); W 100 mm (3.9”); D 110 mm (4.3”)
Resistance Ratings Insulation warning (30 k
Contact Operating Mode Non-fail-safe
Tes t Bu t ton Local
Reset Button Local and remote
Output Contacts Two Form C
Analog Output 0-1 m A
Conformally Coated Consult factory
Warranty 5 years
Mounting DIN, Surface
See ordering information
Insulation alarm (10 k
Ω
)
Ω
and 50 kΩ)
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/pgr-3200
Rev: 4-A-050213
Based on Manual Rev 3a
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