html{display:none} SEL-734W and LINAM WCS Capacitor Bank Control and Wireless Current Sensor (WCS) | Schweitzer Engineering Laboratories


Capacitor Bank Control and Wireless Current Sensor (WCS)

Improve distribution power quality and efficiency with advanced capacitor bank control and wireless current sensing. The SEL-734W can perform time- and temperature-based switching if desired—while providing an easy upgrade path to current and reactive power-based capacitor control. The line-powered LINAM WCS is easier and safer to install than line post sensors and allows you to mount sensors closer to inductive loads.

Starting At

SEL-734W: $2,366

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New or Retrofit Capacitor Bank Installations—Replace your existing socket-based controls with a current-enabled solution without replacing any of the primary equipment using either the 4-jaw socket-based or terminal block interface. For new installations, select an SEL-734W with the 7-pin connector-based interface.

Time- and Temperature-Based Switching—Use the SEL-734W for time- and temperature-based switching now, and easily upgrade to advanced switching control based on power factor or VARs in the future.

Location Flexibility—Measure line current at one point of the distribution system while operating a capacitor bank at a nearby point on the system. This is ideal for situations where the capacitor bank is not near the inductive loads.

Power Quality Monitoring—Improve power quality and address customer concerns with advanced monitoring features, such as harmonic measurements, load profile trending, and voltage sag, swell, and interruption (VSSI) recording.

Ease of Installation—The lightweight current sensors install on an overhead distribution line using a single hot stick. There is no need for an outage or significant hot-line work.

Individual-Phase Switching—The full-size enclosure option enables the addition of three-phase voltage sensing via PT inputs. Combined with the existing three-phase current sensing via the LINAM wireless sensors, this gives the SEL-734W the ability to switch each phase individually.

Received Signal Strength Indicator (RSSI)—A troubleshooting mode in the SEL-734W displays the received signal strength from the LINAM WCS on the front panel, so you can adjust the sensor location for better reception if needed.



The high-accuracy LINAM WCS can be installed up to 1,500 feet away from the capacitor bank. It is rated for voltages up to 38 kV, so you can standardize on one sensor type for all your capacitor bank installations. The clamp-on, line-powered design makes installation safer, quicker, and easier.


Use up to three LINAM wireless sensors to measure current with ±1 percent accuracy and within a 1-degree phase angle. The SEL-734W uses the sensor data to compute reactive power, make switching decisions, and create load profiles.


Use the preconfigured control templates or create custom control schemes with SELogic control equations.


System Monitoring

Use the SEL-734W and LINAM WCS solution to:

  • Monitor active and reactive forward and reverse power flow.
  • Monitor harmonics up to the 15th order.
  • Trend power system conditions with up to 16 recording channels.
  • Log years of data with the load profile recorder.


Provide power to radios, gateways, or other accessories with the integrated 40 W, 15 Vdc power supply.


The SEL-734W and LINAM WCS are approved for use by the governments of the following countries:

  • Brazil
  • Canada
  • United States
  • LINAM WCSs (zero, one, or three)
  • Field interfaces for the SEL-734W in the compact enclosure:
    • 4-jaw socket-based
    • 7-pin connector-based (Connectorized)
    • 7-position terminal block (self-wired)
  • Field interfaces for the SEL-734W in the full-size enclosure:
    • PT inputs
    • 4-jaw socket-based
    • 7-pin connector-based (Connectorized)
    • 7-position terminal block (self-wired)
  • Accessories:
    • Basic accessory tray
    • Accessory tray with integrated 15 Vdc power supply (40 W)


Introduction to the SEL-734W Capacitor Bank Controller

The Firmware IDs for older versions of the firmware can typically be found in Appendix A of the instruction manual.

Instruction Manuals

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734W - Software Tab


acSELerator QuickSet SEL-5030 Software

QuickSet is a tool for engineers and technicians to quickly and easily configure, commission, and manage power system devices. QuickSet includes a Graphical Logic Editor and a device template tool to reduce configuration time and streamline deployment.

Learn more and download on the QuickSet software page.

Automated Data Collection

SEL Data Management and Automation (DMA) Application Suite

Available on the Blueframe platform, DMA applications automatically collect, store, and manage device-specific information like oscillography, Sequence of Events (SOE) data, device settings, and property information. They also provide automated password rotation and streamlined device audits.

Learn more on the DMA software page.

Visualization and Analysis

SEL-5601-2 synchroWAVe Event Software

synchroWAVe Event helps engineers diagnose a protective relay’s behavior during a power system fault. It is a powerful and easy-to-use solution for displaying and analyzing SEL relay event reports and COMTRADE files.

Learn more and download on the synchroWAVe Event software page.

SEL-5705 Synchrowave Reports

Synchrowave Reports automates reporting of metering and power quality data via email or web browser. Quickly identify trends, harmonic disturbances, and other power quality concerns to drive planning, operating, and accounting decisions that will increase efficiency and reduce costs.

Learn more and download on the Synchrowave Reports software page.