Protection Relays Voltage Monitoring Relays 50R SERIES Single-phase voltage monitor Description The 50R series single-phase voltage monitor has a voltage- sensing 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 MotorSavers 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 Features & Benefits FEATURES BENEFITS Proprietary voltage Constant monitoring of single-phase power for sensing circuitry a low voltage condition Prevent nuisance tripping due to rapidly Adjustable trip delay fluctuating power line conditions and allows (-3 models) and restart staggered start up of multiple motors, after a delay (-2 models) settings fault, to prevent a low voltage condition 50R High voltage detection Trips and resets at a fixed percentage of the (-9 models) setpoint: trip 110 %, reset 107 %. 600 V rated relay Eliminates the need for a control transformer contacts available to step voltage down to 120240 V for a control on some models circuit Ordering Information MODEL LINE VOTAGE DESCRIPTION 50R-100 95120 V ac Fixed trip and restart delay 50R-100-2 95120 V ac Fixed trip and variable restart delay (manual, 2300s) 50R200 190240 V ac Fixed trip and restart delay 50R2002 190240 V ac Fixed trip and variable restart delay (manual, 2300s) 50R2003 190240 V ac Fixed restart and variable trip delay (230s) 50R20029 190240 V ac Fixed trip and variable restart delay (manual, 2300s) plus high voltage detection 50R400 380480 V ac Fixed trip and restart delay 50R4002 380480 V ac Fixed trip and variable restart delay (manual, 2300s) 50R4003 380480 V ac Fixed restart and variable trip delay (230s) 50R40029 380480 V ac Fixed trip and variable restart delay (manual, 2300s) plus high voltage detection 2019 Littelfuse, Inc. Rev: 2-B-050719 wwwwww.littelfuse.com/.littelfuse.com/50rProtection Relays Voltage Monitoring Relays 50R SERIES Special Options Specifications Opt. 2: Variable Restart Delay Manual, 2300 seconds Input Characteristics Opt. 3: Variable Trip Delay 230 seconds Line Voltage Opt. 9: High Voltage 50R-100 95120 V ac Detection Operating Points 50R200 190240 V ac Trip (% of Setpoint) 110 % 50R400 380480 V ac Reset (% of Setpoint) 107 % Frequency 50*/60 Hz Functional Characteristics *Note: 50 Hz will increase all delay timers by 20 % 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 480 VA 240 V ac General Purpose 10 A 240 V ac 50R400 Pilot Duty 470 VA 600 V ac General Characteristics Ambient Temperature Range Operating -20C to 70 C (-4 F to 158 F) Storage -40 C to 80 C (-40 F to 176 F) Maximum Input Power 5 W Relative Humidity 1095 %, non-condensing per IEC 68-2-3 Terminal Torque 7 in.-lbs. Wire Size 1218AWG Electrostatic Discharge (ESD) IEC 61000-4-2, Level 3, 6 kV contact, 8 kV air Fast Transient Burst IEC 61000-4-4, Level 3, 3.5 kV input power and controls Transient Protection (Internal) IEC 61000-4-5 1995 6 kV Safety Marks UL UL 508 (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 2019 Littelfuse, Inc. Rev: 2-B-050719 wwwwww.littelfuse.com/50r.littelfuse.com/