Littelfuse PGR-3100 User Manual

Protection Relays & Controls

A

L2

PGR-3200

L1

B

C

(Ground-Fault
Protection System)

Ground-Fault Protection – Ungrounded AC Systems

PGR-3100 SERIES

Ground-Fault Indication System

Simplified Circuit Diagram

Description

The PGR-3100 indicates the presence of voltage on each
phase of a three-phase system. The LEDs on the panel
illuminate when voltage is present. When a ground-fault
occurs, the voltage on the faulted phase reduces to ground
potential, causing the LEDs for the faulted phase to dim
and the LEDs for the unfaulted phases to become brighter.
Ungrounded ac systems are required by the National
Electrical Code (NEC
Electrical Code Part 1, Section 10-106 (2) to have ground
detectors, such as the PGR-3100, installed on the system.
External potential transformers (PTs) can be used to step
down system voltage, allowing the PGR-3100 to be applied to
any system voltage. PTs are not required for system voltages
up to 600 Vac. Also available mounted in NEMA 4 enclosure.

®

) Article 250.21(B) and the Canadian

A

UNGROUNDED

B

SUPPLY

C

PGR-3100

(Ground-Fault
Indication System)

Ordering Information

ORDERING NUMBER MOUNTING

PGR-3100 Panel mount

Features & Benefits

FEATURES BENEFITS

Meets National Electrical Code (NEC

NEC® and CEC Code
compliant

Phase LEDs

Redundant LEDs

Lamp test button Verifies LEDs are operating

250.21(B) and Canadian Electrical Code Part 1,
Section 10-106 (2) requirements for ungrounded
systems

Indicates presence of a ground fault and the
faulted phase as well as phase-to-ground
voltage on an energized bus

Redundant long-life LEDs (two per phase) to
ensure reliability

Specifications

Input Voltage Up to 600 Vac 50/60 Hz
Indicator Off Voltage < 30 Vac line to ground
Dimensions H 88.9 mm (3.5”);

W 108 mm (4.3”);
D 54 mm (2.1”)

Tes t Bu t ton Local
Approvals
Conformally Coated Standard feature
Warranty 5 years
Mounting Panel

CSA certified, UL Listed

®

) Article

Littelfu se res erves the right to m ake product c hanges, without notice. Material in this docum ent is as accurate as known a t the time of publication. Visit Lit telfuse.c om for the mos t up-to-date inf ormation.

© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/PGR-3100

Rev: 4-B-050213

Based on Manual Rev 6