Symcom 50R SERIES Catalog Page

Protection Relays

Voltage Monitoring Relays

50R SERIES

Single-phase voltage monitor

Description

The 50R Series single-phase voltage monitor has a voltage­sensing circuit which constantly monitors the single-phase
power for a low voltage condition. Single-phase motors on fans,
compressors, air conditioners, heat pumps, well pumps, sump
pumps and small conveyor motors are all applicable to the
50R Series.

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 an acceptable
level and a specified amount of time has elapsed (restart
delay). The trip delay prevents nuisance tripping due to rapidly
fluctuating power line conditions.

Wiring Diagram

50R

Features & Benefits

FEATURES BENEFITS

Proprietary voltage
sensing circuitry

Adjustable trip delay
(-3 models) and restart
delay (-2 models) settings

High voltage detection
(-9 models)

600V rated relay
contacts available
on some models

Constant monitoring of single-phase power for a
low voltage condition

Prevent nuisance tripping due to rapidly fluctuating
power line conditions and allows staggered start up
of multiple motors, after a fault, to prevent a low
voltage condition

Trips and resets at a fixed percentage of the
setpoint: trip 110%, reset 107%.

Eliminates the need for a control transformer to step
voltage down to 120 - 240V for a control circuit

Ordering Information

MODEL LINE VOTAGE DESCRIPTION

50R-100 95-120VAC Fixed trip and restart delay

50R-100-2 95-120VAC Fixed trip and variable restart delay (manual, 2-300s)

50R200 190-240VAC Fixed trip and restart delay

50R2002 190-240VAC Fixed trip and variable restart delay (manual, 2-300s)

50R2003 190-240VAC Fixed restart and variable trip delay (2-30s)

50R20029 190-240VAC Fixed trip and variable restart delay (manual, 2-300s) plus high voltage detection

50R400 380-480VAC Fixed trip and restart delay

50R4002 380-480VAC Fixed trip and variable restart delay (manual, 2-300s)

50R4003 380-480VAC Fixed restart and variable trip delay (2-30s)

50R40029 380-480VAC Fixed trip and variable restart delay (manual, 2-300s) plus high voltage detection

Rev: 1-A-062716

Protection Relays

Voltage Monitoring Relays

50R SERIES

Specifications

Input Characteristics

Line Voltage
50R-10 0 95 -120VAC
50R200 190 -240VAC
50R400 380-480VAC
Frequency 50 */60Hz

Functional Characteristics

Low Voltage:
Trip (% of setpoint) 90%
Reset (% of setpoint) 93%
Delay Time (Nominal)
Trip 4 seconds
Restart (low voltage) 2 seconds
Restart (complete power loss) 2 seconds

Output Characteristics

Output Contact Rating
(SPDT - 1 Form C)
50R-100, 50R200
Pilot Duty 48 0VA @ 24 0VAC
General Purpose 10A @ 240VAC
50R400
Pilot Duty 470VA @ 60 0VAC

General Characteristics

Ambient Temperature Range
Operating -20° to 70°C (-4° to 158°F)
Storage -40° to 80°C (-40° to 176°F)
Maximum Input Power 5 W
Relative Humidity 10-95%, non-condensing per IEC 68-2-3
Terminal
Torque 7 in.-lbs.
Wire Size 12-18 AWG
Electrostatic Discharge (ESD) IEC 61000-4-2, Level 3, 6kV contact, 8kV air
Fast Transient Burst IEC 61000-4-4, Level 3, 3.5kV input power

and controls

Transient Protection
(Internal) IEC 61000-4-5; 1995 ±6kV
Safety Marks
UL UL508 (File #E68520)
CE IEC 60947-6-2
Dimensions H 74.4 mm (2.93”); W 133.9 mm (5.27”);
D 74.9 mm (2.95”)
Weight 0.98 lb. (15.68 oz., 444.52 g)
Mounting Method #8 screws

Special Options

Opt. 2: Variable Restart Delay Manual, 2-300 seconds
Opt. 3: Variable Trip Delay 2-30 seconds
Opt. 9: High Voltage
Detection Operating Points
Trip (% of Setpoint) 110 %
Reset (% of Setpoint) 107%

*Note: 50Hz will increase all delay timers by 20%

Rev: 1-A-062716