LS 4

The LS 4 offers a simple solution for complex switchgear applications. The LS 4 has the ability to operate with up to 14 GCP-31 genset controls and 8 LS 4 circuit breaker controllers.
A two line LC display shows the configured names of the analog measuring inputs.
Each controlled breaker is equipped with one LS 4 that measures the three-phase voltage on either side of the breaker (phase angle configurable). Each side of the breaker is designated as either a fixed (utility) or variable (genset) source. This permits the LS 4 to control utility feeder breakers with one fixed source and one variable source, or tie breakers between busses with two variable sources. The LS 4 is used for breaker protection, synchronization, and load control.

View LS 4 H connection application
View LS 4 double H connection application
View LS 4 H multiple incomings application

Product Features:

• True RMS voltage (A and B side)
• True RMS current (A side)
• Synch-check functionality
• Dead bus start functionality
• Synchronous networks functionality
• Remote control of frequency, voltage, and real power
• Zero power transfer control (softload)
• Configurable trip/control set points
• Config. delays for each alarm
• 7 configurable relay outputs
• Two-line LC display
• Synchronization over transformer possible
• CAN bus communication

Protection Functions:

• Overvoltage (ANSI #59)
• Undervoltage (ANSI #27)
• Overfrequency (ANSI #81O)
• Underfrequency (ANSI #81U)
• Phase/vector shift (ANSI #78)
• df/dt ROCOF (rate of change of frequency) (ANSI #81RL)

Certifications / registrations: UL/cUL, CE

Download Technical Documentation

1. To download technical documentation please register here first.
2. Already registered? Login here.
3. After successful login - return to this page and click here to start the download section.

Download LeoPC1 Configuration Files:

Refer to the configuration files download page for other P/Ns 

Download LeoPC1 Configuration Program

Top