RX Motor Protection



AC Input Voltage
200 to 15 kV

Current Rating
5 to 2000 A


Type of Load 3-phase AC induction motors
AC Supply Voltage (Motor Voltage) Direct: 200 - 600VAC, 10%, 50/60hz With 120V PTs: 690 - 15,000VAC
Current Range 1 - 2000 Amps in 3 frame ratings
Sevice Factor Programmable from 1.00 to 1.30 for NEMA design motors
Current Measurement 3 window CTs on units up to 75A, external CTs for higher ratings (meets NEC requirments for 3-leg protection)
Power Wiring Direct feed-through or external CT lead feed-through
LED Display and Keypad 7-segment, 4-digit alpha-numeric display designed for use in high ambient light conditions. Full function, 4- quadrant navigation keys for easy access to status information and programmable functions
LED Status Lights 10 LED indicators on the front panel for relay status
Control Voltage Universal voltage supply, 85 - 265VAC or DC, 50/60Hz
Multi-function Digital Input One (1) dry contact input for Timer Start, Remote Start or Remote Trip
Fault Reset Manual reset via the keypad or cycle control power for remote reset
Programmable Output Contacts One (1) Form C (SPDT) 5A, 240VAC maximum One (1) Form A (SPST) 10A maximum, 1/2 HP @ 240VAC 29 programmable trip functions
Event Timer Control 24 hr, 7 day, 7 event timer allows automatic start w/ batch run time control
Batch Run Timer Control Minimum run timer (resumes timing if stopped) or permissive run timer (only runs during set time). Time setting: 1 - 9999 minutes.
Overload Protection Method Real-time Motor Thermal Modeling uses current sensors and microprocessor to continuously calculate motor temperature
Retentive Thermal Memory Remembers the thermal condition of the motor even if control power is lost. Thermal register is adjusted for Off-time when power is restored.
Dual Overload Curve Settings Two separately programmable overload trip curves; one for starting and one for running. OL trip range: Class 5 - 30.
Learned Dynamic Reset Automatically adjusts other settings to compensate for programmed Service Factory. Adjustment Range: 1.0 - 1.15 SF.
Programmable Service Factor Automatically adjusts other settings to compensate for programmed Service Factory. Adjustment Range: 1.0 - 1.15 SF.
Current Imbalance Protection Monitors phase-to-phase current levels and trips if imbalance exceeds setting. Setting: Off or 5 - 30% of FLA with 1-20 second delay.
Phase Loss / Sequence Protection Trips if any phase < 20% FLA. Sequence selectable A-B-C, C-A-B or Off.
Current Trip Over Current
Under Current
Electronic shear-pin/shock relay. Off or 50-300% FLA, 1-20sec delay
Load-loss/loss of prime. Setting: Off or 10-90% FLA, 1-60sec delay
Over Voltage Trip (any phase) Setting: Off or 1-10% of set voltage with 1-20 second delay
Under Voltage Trip On Startup
At Full Speed
Setting: Off or 1 - 20% of set voltage with 1-120 second startup time
Setting: Off or 1 - 20% of set voltage with 1-20 second trip delay
Load Monitor Under or over kW trip or alarm. Setting: Off or 20 - 100% of motor kW with 1-20sec delay
Power Factor Monitor Leading or lagging PF, trip or alarm. Setting: Off or 0.1 - 1.0PF (lead or lag) with 1-20 second delay
Frequency Monitor Over or under programmed frequency. Setting: Off or 1-10Hz with 1-20sec delay
Equipment Ground Fault Protection Electronic residual current protection method, no additional CTs needed. Setting: Off or 5-90% of CT with 1-60sec delay
Short Circuit / Shorted Load Peak current quick trip (electronic fuse). Trip level: Off or 800-1400% FLA with 0.1 - 0.5sec delay
Restart Delay Timer Programmable delay of restart after a power failure. Setting: 0 - 999 sec.
Starts-per-Hour Lockout Program maximum starts-per-hour in adherence with motor design limitations. Setting: Off or 0 - 10 starts/Hr.
Minimum Time between Starts Used with or without starts-per-hour protection to prevent short cycling of motor. Setting: Off or 1 - 60 minutes between starts
Coast-Down Timer Back spin or anti-windmillling protection prevents restart after stop command has been given. Time setting: Off or 1 - 3600 seconds.
Amp Meter (each phase) Default is Phase A, scroll up or down for phases B, C and ground. 0 - 9999A (999A for ground),
2% accuracy
Volt Meter (each phase) 0-600V, or 1-15kV, 2% accuracy. Displays total voltage imbalance as %.
Elapsed Time Meter Running time from at-speed detection. Resettable only with passwrd.
Range: 0 - 9,999,999.9 hours.
Run Cycle Counter Counts number of starts (at-speed) for maintenance, etc. Resettable only with password.
Range: 0 - 99,999,999 counts.
Power Metering kW, kWHr, kVA, kVAR, or MW, MWHr, MVA, MVAR.
0 - 9999 units, 2% accuracy
Power Factor Metering Leading (inductive) or lagging (capacitive), 0.1 - 1.0 PF
Fault Display Fault code indicator plus 10 LEDs for phase and trip status.
Fault Event Recorder Records and displays previous three (3) fault trips (stored in non-volatile memory). Time and date
stamped. Cleared only with password.
Thermal Capacity Real-time display of motor's remaining thermal capacity after starting or running. Value shown as 0 - 100%
(counts upwards while cooling).
Remaining Time View values of lockout times such as time-between-starts or coast-down timer. View process timer or time clock values.
Environmental Conditions & Approvals
Standard Packaging Protected Chassis (IP00) with DIN rail adaptor
Remote Display Mounting Built in operator interface can be remote mounted up to 10ft (3 meters) away. NEMA 4/12 mounting kit
Altitude Up to 10,000 feet (3000 meters) without derating
Ambient Temperature 0 C to 50C (32F to 122F), 0 to 95% relative humidity
Approvals UL, CUL, CE