SE-145 Series - Ground-Fault Ground-Check Monitor

Series: SE-145
Obsolete: 2018 -01-02
Questions? Contact Littelfuse Support
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Obsolete: 01/02/2018 - The SE-145 is a three-channel, microprocessor-based, combination ground-wire monitor and ground-fault relay for resistance-grounded or solidly grounded systems. It continuously monitors the integrity of the ground wire to protect portable equipment from hazardous voltages caused by ground faults. The SE-145 is designed for use on three-way splitter box applications.


Connect the SE-145 to the network using a standard Ethernet patch cable. Use of a crossover cable to connect the SE-145 directly to the computer running SE-MON-GFGC is not recommended. A typical router will assign an IP address to all connected computers that are using DHCP. The SE-145 does not support the use of DHCP. If the SE-145 is being set-up for first time, it is recommended to only have one SE-145 connected to the network to prevent communication errors.

Click here to download the COMPUTER TO RELAY CONNECTION diagram.



Adjustable pickup
(0.5 - 12.5 A)

Unit can be used on a wide variety of trailing cable applications

Adjustable time delay
(1 - 2.5 s)

Adjustable trip delay for quick protection and system coordination

Output contacts

Separate annunciation of ground-fault and ground-check faults

LED indication

Indication of open or short ground-check wire makes it easier to find faults

CT-Loop monitoring

Alarms when CT is not connected

High-induced-ac rejection

Makes unit suitable for applications with high voltages and long cables

DFT (harmonic) filter

Prevents false operation

Zener-characteristic termination assembly

Provides reliable ground-check loop verification

Fail-safe circuits

Ensures ground-check and ground-fault circuits remain safe even in the event of equipment failure

Conformal coating

Additional coating protects circuit boards against harsh environment

Access specifications, certifications, check availability and order parts below

Catalog #CommunicationsDimensionsFrequencyCompare
SE-145-00-008.4H X 7.6W X 7.0D50
SE-145-00-108.4H X 7.6W X 7.0D
SE-145-03-00Ethernet8.4H X 7.6W X 7.0D
SE-145-03-10Ethernet8.4H X 7.6W X 7.0D

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