Name: SE-330AU Series - Neutral-Earthing-Resistor Monitor
Brand: Littelfuse Inc.

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

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 Config	Analog Output Current mA	Communications	New Rev Avail	Old Rev Avail	IEEE Device Numbers	Relay Contact Operating	Dimensions	Weight (lbs/g)	Auto Manual Reset	Conformally coated	Frequency	GF Trip Level A

SE-330AU-00-00	65 - 265	85 - 275	2 Form A; 2 Form C	4 - 20	USB	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-00-01	65 - 265	85 - 275	1 Form A; 1 Form B; 2 Form C	4 - 20	USB	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-01-00	65 - 265	85 - 275	2 Form A; 2 Form C	4 - 20	USB; DeviceNet	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-01-01	65 - 265	85 - 275	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; DeviceNet	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-03-00	65 - 265	85 - 275	2 Form A; 2 Form C	4 - 20	USB; Ethernet (Dual RJ45)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-03-01	65 - 265	85 - 275	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; Ethernet (Dual RJ45)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-04-00	65 - 265	85 - 275	2 Form A; 2 Form C	4 - 20	USB; Ethernet (RJ45 and SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-04-01	65 - 265	85 - 275	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; Ethernet (RJ45 and SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-05-00	65 - 265	85 - 275	2 Form A; 2 Form C	4 - 20	USB; Ethernet (Dual SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-05-01	65 - 265	85 - 275	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; Ethernet (Dual SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-06-00	65 - 265	85 - 275	2 Form A; 2 Form C	4 - 20	USB; IEC61850 (Dual RJ45)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-06-01	65 - 265	85 - 275	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; IEC61850 (Dual RJ45)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-07-00	65 - 265	85 - 275	2 Form A; 2 Form C	4 - 20	USB; IEC61850 (RJ45 and SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-07-01	65 - 265	85 - 275	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; IEC61850 (RJ45 and SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-08-00	65 - 265	85 - 275	2 Form A; 2 Form C	4 - 20	USB; IEC61850 (Dual SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-08-01	65 - 265	85 - 275	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; IEC61850 (Dual SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-20-00	28 - 52	36 - 72	2 Form A; 2 Form C	4 - 20	USB	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-20-01	28 - 52	36 - 72	1 Form A; 1 Form B; 2 Form C	4 - 20	USB	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-21-00	28 - 52	36 - 72	2 Form A; 2 Form C	4 - 20	USB; DeviceNet	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-21-01	28 - 52	36 - 72	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; DeviceNet	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-23-00	28 - 52	36 - 72	2 Form A; 2 Form C	4 - 20	USB; Ethernet (Dual RJ45)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-23-01	28 - 52	36 - 72	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; Ethernet (Dual RJ45)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-24-00	28 - 52	36 - 72	2 Form A; 2 Form C	4 - 20	USB; Ethernet (RJ45 and SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-24-01	28 - 52	36 - 72	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; Ethernet (RJ45 and SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-25-00	28 - 52	36 - 72	2 Form A; 2 Form C	4 - 20	USB; Ethernet (Dual SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-25-01	28 - 52	36 - 72	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; Ethernet (Dual SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-26-00	28 - 52	36 - 72	2 Form A; 2 Form C	4 - 20	USB; IEC61850 (Dual RJ45)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-26-01	28 - 52	36 - 72	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; IEC61850 (Dual RJ45)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-27-00	28 - 52	36 - 72	2 Form A; 2 Form C	4 - 20	USB; IEC61850 (RJ45 and SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-27-01	28 - 52	36 - 72	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; IEC61850 (RJ45 and SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-28-00	28 - 52	36 - 72	2 Form A; 2 Form C	4 - 20	USB; IEC61850 (Dual SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0
SE-330AU-28-01	28 - 52	36 - 72	1 Form A; 1 Form B; 2 Form C	4 - 20	USB; IEC61850 (Dual SC Fiber)	Now	No longer available	50G - 50N - 51G - 51N - 59N - 86	Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	0.125 - 30.0

	SE-330AU Datasheet
	SE 330,SE 330HV, SE 330AU Manual
	SE-330-SE-330AU-SE-330HV Ethernet Interface Manual
	SE-330 DeviceNet Manual - New Revision
	Protection Relays and Controls Catalog
	Protection Relays and Controls Catalog - Mandarin
	Protection Relays and Controls Catalog - Spanish
	SE-330, SE-330AU, SE-330HV 3D Model STP
	ER_15KV 3D Model
	ER-25KV Diagram CAD Drawing
	ER-600VC CAD Drawing
	TN RG01 Monitoring with Isolated Ground Beds