Motor Protection

SEL-749M Motor Relay

• Superior Thermal Overload Protection
  Incorporates the SEL-patented thermal overload model and many other motor protection elements.
• Compact and Efficient Hardware Package
  Features a small form factor and rapid disconnect capability.
• Voltage Inputs
  Provides an optional voltage input card for voltage,power,and power factor protection and measurement.
• Expandable I/O
  Incorporates optional I/O expandability for a variety of monitoring and control configurations including 4 –20 mA analog output.
• RTD and PTC Inputs
  Includes both RTD and PTC support for thermal overload protection on critical motor applications.
• Flexible Communications Options
  Includes EIA-232,EIA-485,and Modbus RTU protocol options for optimum connectivity.
• ACSELERATOR® SEL-5030 Software
  Save engineering time while keeping flexibility. Communicate with the SEL-749M through any ASCII terminal, or use the ACSELERATOR^® SEL-5030 Software graphical user interface.

SEL-701 Motor Protection Relay

• Complete motor protection including locked rotor, running overload and negative-sequence current unbalance using a patented thermal model.
• Motor starts and trend reports, unprecedented analytical tools for motor applications and load profiling.
• Modbus^® RTU and ASCII protocols.
• Optional programmable RTD inputs, either internal to the relay or via an external remote module (SEL-2600), with fiber optic connectivity to the relay.
• Multi-cycle event reports, sequence of events recorder, instantaneous metering, demand metering, load profile report, RTD inputs, SELOGIC^® equations, non-volatile latch control switches and remote control switches.

SEL-701-1 Monitor

• Seven user-programmable LED targets for enhanced monitoring flexibility.
• Full motor protection functionality to maximize product value and utilization.
• User control of the thermal element to simplify monitoring functions when thermal element is not in use.
• Individually programmable RTDs, each with one trip and three alarm levels, for enhanced thermal monitoring and control of critical substation apparatus.
• Comprehensive event reports stored in nonvolatile memory: motor starts, motor start trend, load profile, sequential events records (SER), and full event reports.
• ASCII and Modbus^® communication interface using off-the-shelf communications packages (terminal emulators).

SEL-501 Dual Universal Overcurrent Relay

• Provides protection for two motors (using the SEL patented thermal model) when RTDs are not required.
• The motor thermal model automatically switches between starting and running conditions and requires only basic information about the motor.
• Modbus^® RTU and ASCII protocols.
• Multi-cycle event reports, instantaneous metering and demand metering.

SEL-2600A RTD Module

The new SEL-2600A supports the following SEL products:

• SEL-701 Motor Relay: Built-in V-System connector for 200-micron fiber connection with the V-System version of the SEL-2600A
• SEL-300G, SEL-387A, SEL-421, SEL-2030, or SEL-2032: SEL-2800 Fiber-Optic Transceiver with the V-System version of the SEL-2600A
• SEL-749M Motor Relay: Built-in ST connector for 62.5-micron fiber connection with the ST version of the SEL-2600A
• Other improvements include conformal coating of the circuit board, which is standard on the SEL-2600A for enhanced environmental ruggedness, and a power supply with an improved capability to withstand surges.

• Connect any one of four different RTD types on each independent input.
  • 100 Ohm Platinum
  • 100 Ohm Nickel
  • 120 Ohm Nickel
  • 10 Ohm Copper
• Replace expensive RTD cable pulls using a single fiber-optic cable.
• Measure and transmit data from RTDs located in transformers, breakers, motors, generators, or other system apparatus in combination with the SEL-2030 or SEL-2032 Communications Processor.
• Fully compatible replacement for the SEL-2600 RTD Module.