Submittal Sheet

©2017 Littelfuse Protection Relays & Controls
206
Protection Relays
Voltage Monitoring Relays
www.littelfuse.com/202
Description
The 202 Series is a 3-phase, auto-ranging, dual-range voltage
monitor that protects 190-480VAC, 50*/60Hz motors regardless
of size. The 202-RP (and the 202-575-RP for 475-600VAC)
monitors the phase rotation of 3-phase systems and trips on
reverse-phase only. Critical applications include fan motors,
scroll compressors, grinders, conveyor systems, elevators and
escalators. Both products provide a user selectable nominal
voltage setpoint and automatically select between the 200V and
400V range.
This unique microcontroller-based voltage and phase-sensing
device constantly monitors the 3-phase voltages to detect
harmful power line conditions. When a harmful condition is
detected, the MotorSaver’s output relay is deactivated after a
specified trip delay. The output relay reactivates after power line
conditions return to acceptable levels for a specified amount of
restart delay time (or a manual reset). The 202 Series includes
advanced single LED diagnostics. Five different light patterns
distinguish between faults and normal conditions. The status
light turns green and the relay is activated when rotation is
correct.
Features & Benefits
FEATURES BENEFITS
Compact, quick
mounting design
1-screw mounting saves time and space. Small
footprint ideal for assembly into panels.
Proprietary
microcontroller
based circuitry
Constant monitoring of single-phase, low voltage,
high voltage, voltage unbalance, phase reversal,
harmful power line conditions.
Auto-sensing wide
voltage range
(202 & 202-RP
Automatically senses system voltage between
90 - 480VAC. Saves setup time.
Advanced LED
diagnostics
Quick visual indicator for cause of trip. LED
indications include: normal operation, restart delay,
reverse-phase trip, fault
Adjustable trip
delay (202)
Prevent nuisance tripping due to rapidly fluctuating
power line conditions.
Ordering Information
MODEL
LINE
VOLTAGE
DESCRIPTION
202
190-480VAC
Standard protection with low/high voltage
trip, voltage unbalance
202-RP
190-480VAC
Trips on reverse-phase only
202-575-RP
475-600VAC
Designed for higher voltage systems and
trips on reverse-phase only
3-Phase Voltage/Phase Monitor
202 SERIES
Wiring Diagram
L1
L1
MOTOR
ALARM
ALARM
POWER
240 VAC
MAX.
INPUT POWER
L2
L2
L3
L3
NC
NO COM
202
OL OL OL
M M M
L1
L1
MOTOR
START
HAND
OFF
AUTO
CONTROL
VOLTAGE
240 VAC MAX.
STOP
INPUT POWER
L2
L2
L3
L3
NC
NO COM
202
OL OL OL
OL
M M M
M
M
202 WITH ALARM CIRCUIT
202 WITH MOTOR CONTROL
AC SYSTEM MONITORS/LOAD SENSORS
9
For dimensional drawing see: Appendix, page 509, Figure 7.