SE-330AU Series - Neutral-Earthing-Resistor Monitor

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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-330AU is an advanced earth-fault and earthing-resistor monitoring relay for low- and medium-voltage transformers and generators that is compliant with AS/NZS 2081:2011. It measures neutral current, neutral-to-earth voltage, and neutral-to-earth resistance. It provides continuous monitoring of the neutral-to-earth path to verify that the neutral-earthing resistor (NER) is intact, and also that it has not been bypassed or shorted. An open NER renders current-sensing earth-fault protection inoperative and could result in a false belief that the system is functioning properly. A shorted NER results in higher-than-expected earth-fault current. A unique LED flashing code provides external confirmation for plant safety teams and inspectors when standards-compliant protection has been configured and is active.

The SE-330AU earth-fault function complies with AS/NZS 2081:2011 Section 6, and the NER integrity monitoring function complies with AS/NZS 2081:2011 Section 8. For non-AS/NZS 2081 applications, see the SE-330 for applications up to 35 kV, or the SE-330HV for applications up to 72 kV.

Complete setup of the SE-330AU requires connection to a PC running SE-MON330 v4.10 or higher.

 

Access specifications, certifications, check availability and order parts below

Catalog #Supply
Voltage
VAC
Supply
Voltage
VDC
Relay Contacts ConfigAnalog Output Current mACommunicationsNew Rev AvailOld Rev AvailIEEE Device NumbersRelay
Contact
Operating
DimensionsWeight (lbs/g)Auto Manual ResetConformally coatedFrequencyGF Trip Level ASamplesCompare
SE-330AU-00-0065 - 26585 - 2752 Form A; 2 Form C4 - 20USBNowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-00-0165 - 26585 - 2751 Form A; 1 Form B; 2 Form C4 - 20USBNowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-01-0065 - 26585 - 2752 Form A; 2 Form C4 - 20USB; DeviceNetNowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-01-0165 - 26585 - 2751 Form A; 1 Form B; 2 Form C4 - 20USB; DeviceNetNowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-03-0065 - 26585 - 2752 Form A; 2 Form C4 - 20USB; Ethernet (Dual RJ45)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-03-0165 - 26585 - 2751 Form A; 1 Form B; 2 Form C4 - 20USB; Ethernet (Dual RJ45)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-04-0065 - 26585 - 2752 Form A; 2 Form C4 - 20USB; Ethernet (RJ45 and SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-04-0165 - 26585 - 2751 Form A; 1 Form B; 2 Form C4 - 20USB; Ethernet (RJ45 and SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-05-0065 - 26585 - 2752 Form A; 2 Form C4 - 20USB; Ethernet (Dual SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-05-0165 - 26585 - 2751 Form A; 1 Form B; 2 Form C4 - 20USB; Ethernet (Dual SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-06-0065 - 26585 - 2752 Form A; 2 Form C4 - 20USB; IEC61850 (Dual RJ45)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-06-0165 - 26585 - 2751 Form A; 1 Form B; 2 Form C4 - 20USB; IEC61850 (Dual RJ45)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-07-0065 - 26585 - 2752 Form A; 2 Form C4 - 20USB; IEC61850 (RJ45 and SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-07-0165 - 26585 - 2751 Form A; 1 Form B; 2 Form C4 - 20USB; IEC61850 (RJ45 and SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-08-0065 - 26585 - 2752 Form A; 2 Form C4 - 20USB; IEC61850 (Dual SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-08-0165 - 26585 - 2751 Form A; 1 Form B; 2 Form C4 - 20USB; IEC61850 (Dual SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-20-0028 - 5236 - 722 Form A; 2 Form C4 - 20USBNowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-20-0128 - 5236 - 721 Form A; 1 Form B; 2 Form C4 - 20USBNowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-21-0028 - 5236 - 722 Form A; 2 Form C4 - 20USB; DeviceNetNowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-21-0128 - 5236 - 721 Form A; 1 Form B; 2 Form C4 - 20USB; DeviceNetNowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-23-0028 - 5236 - 722 Form A; 2 Form C4 - 20USB; Ethernet (Dual RJ45)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-23-0128 - 5236 - 721 Form A; 1 Form B; 2 Form C4 - 20USB; Ethernet (Dual RJ45)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-24-0028 - 5236 - 722 Form A; 2 Form C4 - 20USB; Ethernet (RJ45 and SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-24-0128 - 5236 - 721 Form A; 1 Form B; 2 Form C4 - 20USB; Ethernet (RJ45 and SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-25-0028 - 5236 - 722 Form A; 2 Form C4 - 20USB; Ethernet (Dual SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-25-0128 - 5236 - 721 Form A; 1 Form B; 2 Form C4 - 20USB; Ethernet (Dual SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-26-0028 - 5236 - 722 Form A; 2 Form C4 - 20USB; IEC61850 (Dual RJ45)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-26-0128 - 5236 - 721 Form A; 1 Form B; 2 Form C4 - 20USB; IEC61850 (Dual RJ45)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-27-0028 - 5236 - 722 Form A; 2 Form C4 - 20USB; IEC61850 (RJ45 and SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-27-0128 - 5236 - 721 Form A; 1 Form B; 2 Form C4 - 20USB; IEC61850 (RJ45 and SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-28-0028 - 5236 - 722 Form A; 2 Form C4 - 20USB; IEC61850 (Dual SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order
SE-330AU-28-0128 - 5236 - 721 Form A; 1 Form B; 2 Form C4 - 20USB; IEC61850 (Dual SC Fiber)NowNo longer available50G - 50N - 51G - 51N - 59N - 86Fail-safe8.4 H x 3.9 W x 5.8 D in.0 KgLatching; AutoresetStandard50; 60; ASD0.125 - 30.0Order

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