Take your motor protection to a new level. The RX Series provides more than just solid state overload or power protection relays. By using features previously found only in large expensive Motor Protection Relays, the RX Series allows even small to medium sized motor applications to be protected by the best technology available, yet at a price affordable to all.

Advanced Technology for Maximum Motor and System Protection

The RX Series uses Thermal Modeling software normally found only in the most sophisticated Motor Protection Relays. This software keeps track of power related issues occurring in the motor circuit that contribute to causing a thermal overload. If there is a power loss, a unique combination of non-volatile memory and a real-time clock ensure that this protection is in effect when power is restored. Should an overload occur, the RX Series is intelligent enough to make sure that it can only be reset when the motor is sufficiently cooled down and is ready to start again successfully. Voltage input features allow true Motor Load Monitoring, not just current, along with Power Factor, kVA and Frequency.

Built-in Flexible Control Features Provide Cost and Space Savings

A 24 hour / 7 day Real Time Clock on board allows for several additional features that can eliminate the need for other discrete devices. Duty cycle can be controlled by using the Starts/Hour and Minimum Time Between Starts features, plus a Coast-Down / Backspin timer can prevent restarting while a motor is spinning backwards. In addition, simple Batch Time processes of up to 7 events can be programmed for daily, multi-day or weekly operations without the need for an external time clock. A Restart Delay timer allows staggered restarting of multiple units as well.

Add Metering and Communications to New or Existing Starters

Metering for Three Phase Currents, Voltages, kW, kVA, kVAR, Power Factor, Frequency, kWH, Elapsed Run Time, Run Cycle Count, Lock-Out Time, Reset Time and Remaining Thermal Capacity are all included, and can be both read on the display and communicated via the built-in RS-485 Modbus RTU comm. Port. Optional converters allow communications via DeviceNet, Field Bus, Profibus and other protocols as well. Fault memory with time and date stamps helps in troubleshooting and returning to operation.

Where to Buy

Sales Managers


Peter Boyle


Giacomo Raggi


Gemma Gaunt

Europe, Middle East, Africa & India

Motortronics UK Ltd
Bristow House, Gillard Way, Lee Mill Industrial Estate, Ivybridge, PL21 9GG, UK

T : +44 (0) 1752 894554
E : [email protected]

Asia & Australasia

Motortronics International Korea
#601, 632, Seobusaet-gil, Geumcheon-gu, Seoul

T : +82 (0) 2 867 5808
E : [email protected]

Motortronics International Korea
41, Cheoyongsaneop 4-gil, Cheongnyang-eup, Ulju-gun, Ulsan

T : +82 (0) 52 237 5805
E : [email protected]

The Americas

Motortronics Inc
1600 Sunshine Drive, Clearwater
FL, 33765

T : +1 727 573 1819
E : [email protected]


M & P Machinery & Electronics Control
32 Jiaxin Road, Jimo,, Qingdao, 266229

T : +86 53281 725028
E : [email protected]

Beijing Locensate Energy Saving Technology Co. Ltd (LV - Sales)
411 Guangyi Building B 5#, Guangyi Road, Beijing, 100053

T : +86 10 83 131799
E : [email protected]