SE-325 Series – Neutral-Grounding-Resistor Monitor Series - Littelfuse SE-325 Neutral-Grounding-Resistor Monitors Provide Superior Protection

Series: SE-325 Series – Neutral-Grounding-Resistor Monitor
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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The SE-325 series is a neutral-grounding-resistor monitor used on resistance-grounded systems up to 25 kV to monitor the integrity of the neutral-to-ground path and to detect ground faults. It measures current and voltage in a transformer or generator neutral-to-ground connection and continuity of the neutral-grounding resistor (NGR). The SE-325 monitor coordinates these three measurements to detect a loose connection, corrosion, ground fault, or NGR failure, and provides one alarm or trip output contact.

Features

  • Continuous NGR monitoring
  • Output contacts
  • Ground-fault detection
  • Adjustable pickup (0.5–4 A)
  • Adjustable time delay (0.1–2 s)
  • Selectable contact operating mode

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

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NGR Set-Point Assistant

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NGR Set-Point Assistant

Weather-Protected Sensing Resistor

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Access specifications, certifications, check availability and order parts below

Catalog #Supply
Voltage
VAC		Supply
Voltage
VDC		Relay Contacts ConfigIEEE Device NumbersRelay
Contact
Operating		Weight (lbs/g)Auto Manual ResetConformally coatedFrequencyGF Trip Level AGF Trip Time sHarmonic FilteringReset TypeRF Trip
Level
V		RF Trip
Time Delay
s		SamplesCompare
SE-3251201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325D1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325DN1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325DNT1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325DS1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325DSN1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325DSNT1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325DST1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325DT1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325E2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325EN2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325ENT2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325ES2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325ESN2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325ESNT2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325EST2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325ET2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325N1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325NT1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325P1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order
SE-325S1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325SN1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325SNT1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325ST1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20Order
SE-325T1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5Order

pdficon SE-325 Datasheet

icon-request-icon SE-325 3D Model STP

pdficon SE-325 Manual Chinese

pdficon Protection Relays and Controls Catalog

pdficon Protection Relays and Controls Catalog - Spanish

pdficon Protection Relays and Controls Catalog - Mandarin

CAD-DWG-icon SE-325 CAD DWG

pdficon PGR-6101 Manual

pdficon TN RG03 SE-325 neutral grounding resistor monitor setting

pdficon TN RG02 application o SE-325 on alarm only systems

pdficon TN RG04 SE-325 neutral grounding resistor monitor guideform specifications

pdficon TN RG06 SE-VS1002k Voltage Scaler For The SE- 325

pdficon TN GF10 Pulsing Ground-Fault Systems

pdficon TN RG07 SE-Vs50010k Voltage Scaler

pdficon TN RG14 Neutral Grounding Resistor Checklist

pdficon TN RG09 Multiple Sources Single Neutral Grounding Resistor

pdficon TN RG15 Implementing Resistance Grounding on Solidly Grounded Systems

pdficon TN RG05 SE-330 Neutral Grounding Resistor Monitor Guideform Specification

pdficon TN RG11 Voltage Metering In Resistance Grounded Systems

pdficon TN RG12 Implementing Resistance Grounding On Ungrounded Systems

pdficon TN 11-1 AU Earth fault ct selection flowchart

pdficon TN 11-2 Locating phase conductors in a zero sequence ct window

pdficon TN 11-4 Trailing cable types

pdficon TN 11-7 Locating phase conductors in a zero sequence ct window

pdficon TN RG01 Monitoring with Isolated Ground Beds

pdficon TN MI01 DIELECTRIC TESTS on SE-105 SE-125 SE-325 and SE-701

pdficon SE-325 2D Print PDF

pdficon SE-325 Manual


  • Showing 10 items
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
SE-325S NGR MONITOR EXT RES TRIP TIME RoHS No 05/03/2021 PbFree No 05/03/2021
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