Home :Products :Cat Electric Power :Cat Switchgear :Emergency Transfer Load Manager (EXL)


The EXL is a wall mounted system that monitors and controls a single engine generator for in parallel with a single utility source. This cost effective alternative to switchgear mounted controls is designed for voltages from 208V – 32kV. The EXL will support Emergency Standby as well as Utility Paralleling.

Technical Summary
Configuration Wall mounted paralleling control system that monitors and controls a single generator and a single utility.
Modes of Operation Utility Import, Export, and base load operations, Peak shaving, and Emergency Standby. Closed Transition to/from Generator Power
Application LV and MV (208V-32kV)

Generator Protective Devices
ANSI Protective Devices 15/25. 27/59, 81 O/U, 32, 40, 50, 51

Utility Protective Devices
ANSI Protective Devices 15/25. 27/59, 81 O/U, 32, 40, 47, 51, 86

Environmental Parameters
Certifications IBC, CBC, UBC, & OSHPD Certified
Control Panel Enclosure NEMA 1 or NEMA 3R Freestanding Construction
Operating Temperature 0-50°C
Storage Temperature -20°C to +60°C
Low Voltage Standards NEMA SG-5, CSA,ANSI C37.51, ANSI C37.20.1, UL1558 or UL 891, NFPA 110, NFPA 99 and NFPA 70
Medium Voltage Standards NEMA SG-5, ANSI / IEEE C37.20.2, CSA-C22.2 No. 31-M89, EEMAC G8-3.2, NFPA 70, NFPA 99 and NFPA 1110

Product Features

  • Automatic Synchronizing and Paralleling Controls
  • Automatic operation Emergency Standby applications
  • Communications with the on package genset controller which affords viewing of detailed engine and generator parameters on the LCD display
  • Accommodates interface to a user Building Management System via ModBus RS-485
  • User configurable engine exercise mode
  • Password Security System to ensure system security

Standard Equipment

Instant Auto Selector Switch
  • Allows user to return sysem to automatic in the event of a touchscreen failure
Spare inputs and outputs
  • 3 digital inputs and 6 relay outputs programmable from the HMI

Optional Equipment

Supplemental Hardware 25 Device
  • Provides additional discrete synchronization protection


Andy Downs
423-463-2131 or 423-698-6943

Neal Reinhardt
865-595-1034 or 865-771-1036