SE-330-24-00 - SE-330 Series

Series: SE-330
Questions? Contact Littelfuse Support
Littelfuse SE-330 New Revision
Roll Over to Zoom

The SE-330 is an advanced ground-fault and neutral-grounding resistor monitoring relay that is compliant with Rule10-302 of the 2018 Canadian Electrical Code Part I (CE Code). It measures neutral current, neutral-to-ground voltage, and neutral-to-ground resistance. It provides continuous monitoring of the neutral-to-ground path to verify that the neutral-grounding resistor (NGR) is intact and that it has not been bypassed or shorted. An open NGR renders current sensing ground-fault protection inoperative and could result in a false belief that the system is functioning properly. A shorted NGR results in higher-than-expected ground-fault current. The SE-330 can be used with low- and medium-voltage transformers and generators with low- or high-resistance grounding used in processing, manufacturing, chemical, pulp and paper, petroleum, and water-treatment facilities. For high-voltage applications, use the SE-330HV. For applications that require conformance to Australian standard AS/NZS 2081.3:2002, use the SE-330AU.

For applications where existing switchgear is inaccessible or where a separate control panel is desirable, the SE-330 is also available within a NEMA 4X enclosure. The NGRM-ENC Series is available various options, including a surface-mounted or door-mounted SE-330, to fit the specific customer application.

Product Literature

For Technical Questions

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

Request a Quote

NGR Set-Point Assistant

NGR-Thumb Click here to use the
NGR Set-Point Assistant

Property (Mouseover for details) Value
Analog Output Current (mA) 4-20
Approvals CSA UL CE C-Tick
Comms USB Ethernet (RJ45 and SC Fiber)
Relay Contacts Two Form A Two Form C
Supply Voltage (VAC) 28-52
Supply Voltage (VDC) 36-72
New Revision Availability Now
Old Revision Availability No longer available
IEEE Device Numbers 50G
50N
51G
51N
59N
86
Relay Contact Operating Mode Fail-safe
Non Fail-safe
Dimensions 8.4H X 3.9W X 5.8D

pdf icon SE-330 Datasheet - New Revision

The SE-330 is an advanced ground-fault and neutral-grounding- resistor monitoring relay. It measures neutral current, neutral-to- ground voltage, and neutral-to-ground resistance.
pdf icon SE-330 Manual - New Revision

A high-resistance-grounded system uses a neutralgrounding resistor (NGR) with a low let-through current to limit ground-fault current. This is an improvement over low-resistance- or solidly grounded systems because, in those systems, a ground-fault flash hazard exists and a ground fault can result in substantial point-of-fault damage.
pdf icon SE-330 Manual - Previous Revision

A high-resistance-grounded system uses a neutral- grounding resistor (NGR) with a low let-through current to limit ground-fault current.
pdf icon SE-330 Datasheet - Previous Revision

The SE-330 is an advanced ground-fault and neutral-grounding- resistor monitoring relay. It measures neutral current, neutral-to- ground voltage, and neutral-to-ground resistance.
SE-330 One Access Point

SE-330 Two Access Points

SE-330 EthernetIP Electronic Data Sheet (.eds) - New Revision

SE-330 EthernetIP Electronic Data Sheet (.eds) - Previous Revision

SE-330 DeviceNet Electronic Data Sheet (.eds) New Version

SE-330 DeviceNet Electronic Data Sheet (.eds) - Previous Revision

pdf icon SE-330 DeviceNet Manual - New Revision

This document describes the DeviceNet features supported by the new revision SE-330, SE-330AU, and SE-330HV.
pdf icon SE-330 DeviceNet Manual - Previous Revision

This document describes the Anybus DeviceNet features supported by the SE-330/SE-330AU/SE-330HV.

pdf icon SE-330 Profibus Manual - Previous Revision

The Profibus-DP slave interface on the SE-330/ SE-330AU/SE330HV is used to access meter data and provide reset functions. Set points can be read but not written.

pdf icon SE-330 EthernetIP Manual - New Revision

This document describes the EtherNet/IP features supported by the new revision SE-330, SE-330AU, and SE-330HV.
pdf icon SE-330 EthernetIP Manual - Previous Revision

This document describes the Anybus Ethernet IT features supported by the SE-330/SE-330AU/SE-330HV.

pdf icon SE-330 MODBUS TCP Manual - New Revision

This document describes the Modbus/TCP features supported by the new revision SE-330, SE-330AU(1), and SE-330HV.
pdf icon SE-330 IEC 61850 Interface Manual - New Revision

This manual describes the features of the SE-330, SE-330AU, and SE-330HV IEC 61850 interface.
pdf icon SE-330 IEC 61850 Communication Conformance Statement

The purpose of this document is to declare the conformance of the SE-330 IEC 61850 server to the IEC 61850 standard.
SE-MON330 v4.0 Software

This software is used to receive data from SE-330, SE-330AU, and SE-330HV Neutral-Grounding-Resistor Monitors. It will display the relay's set points as well as measured values.
ER-15Kv 3D Model

dwg SE-330 Surface Mount Adapter CAD Drawing

dwg SE-330 CAD Drawing Previous Revision

dwg SE-330 CAD Drawing New Revision

dwg ER-25kv CAD Drawing

dwg ER-600VC CAD Drawing

pdf icon TN RG-01 NGR Monitoring Isolated Ground Beds

pdf icon TN RG-05 SE-330 Guideform Specification

pdf icon TN RG-07 SE-VS50010K Voltage Scaler

pdf icon TN RG-08 SE-330 Settings

pdf icon TN RG-09 Single NGR for Multiple Sources

pdf icon TN-RG11 Voltage Metering on RG Systems

pdf icon TN RG-12 Convert Ungrounded to Resistance Grounded

pdf icon TN RG-14 NGR Package Checklist

pdf icon TN GF-10 Pulsing Ground-Fault Systems

pdf icon SE-330 Firmware Update Instructions

pdf icon Monitoring Neutral Grounding Resistors

Resistance grounding prevents many of the problems that are associated with ungrounded and solidly grounded electrical distribution and utilization systems.
SE-330, SE-330AU, SE-330HV 3D Model