Series: SE-330 Series – Neutral-Grounding-Resistor Monitor

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-330 series is an advanced ground-fault and neutral-grounding-resistor monitoring relay that is compliant with Rule 10-302 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. 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-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 applications above 35 kV, use the SE-330HV. For applications that require conformance to Australian/New Zealand standard AS/NZS 2081, use the SE-330AU.

Complete setup of the SE-330 requires connection to a PC running SE-MON330 software v4.10 or higher. There are three available protocol options for network communications:

IEC 61850 - with dual RJ45, SC Fiber and RJ45, or Dual SC Fiber Interface
Modbus TCP and Ethernet/IP - with dual RJ45, SC Fiber and RJ45, or Dual SC Fiber Interface
DeviceNet - with CAN interface

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 with various options, including a surface-mounted or door-mounted SE-330 to fit specific customer applications.

Resistor Monitoring
The SE-330 combines the measured values of resistance, current, and voltage to continuously determine that an NGR is intact. It is able to detect an open or shorted resistor with or without a ground fault present. Sensing resistors are matched to the system voltage and are used to monitor NGRs on systems up to 72 kV.

Ground-Fault Monitoring
The SE-330 uses an application-appropriate current transformer to reliably detect ground-fault currents as small as 100 mA. Discrete-Fourier Transform (DFT) filtering ensures that false trips due to harmonic noise from adjustable-speed drives do not occur. Should the resistor open and a ground fault subsequently occur, the SE-330 will detect the fault through voltage measurement while other current-only sensing relays would be ineffective.

Pulsing Ground-Fault Location
The SE-330 is capable of controlling a pulsing contactor, which is used to switch the NGR resistance in a pulsing-compatible NGR package. The resulting ground-fault current is distinguishable from charging currents and noise and will only appear upstream of the ground fault, making fault location fast and easy, even without isolating feeders or interrupting loads.

Features

Continuous NGR monitoring
Shorted NGR detection
Ground-fault detection
Adjustable pickup (2–100 %)
Adjustable time delay (0.1–10 s)
Universal CT compatibility
Programmable output contacts
Selectable contact operating mode
Analog output (4–20 mA)
Pulsing output (SE-330 only)
Trip records
Harmonic filtering (DFT)
Local communications
Data logging
Network communications
Network communications: three protocol options
Software
Selectable reset mode
Unit-healthy output
Conformal coating

Product Literature

For Technical Questions

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

NGR Set-Point Assistant

Click here to use the
NGR Set-Point Assistant

Find Littelfuse Neutral Grounding Resistor Products

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 Range pct	Samples

SE-330-00-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-00-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-01-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-01-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-03-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-03-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-04-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-04-01	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 / Non Fail-safe		0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-05-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-05-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-06-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-06-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-07-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-07-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-08-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-08-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-20-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-20-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-21-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-21-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-23-00	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 - 87	Fail-safe / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	3 - 100% of CT-Primary Rating
SE-330-23-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating
SE-330-24-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-24-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-25-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-25-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-26-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-26-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-27-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-27-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-28-00	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order
SE-330-28-01	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 / Non Fail-safe	8.4 H x 3.9 W x 5.8 D in.	0 Kg	Latching; Autoreset	Standard	50; 60; ASD	2 - 100% of CT-Primary Rating	Order

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