SE-330HV-07-00 - SE-330HV Series – Neutral-Grounding-Resistor Monitor Series

Series: SE-330HV Series – Neutral-Grounding-Resistor Monitor
Availability: Obsolete

Obsolete
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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-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. It provides continuous monitoring of the neutral-to-ground path to verify that the neutral-grounding resistor (NGR) is intact. This is of utmost importance—an open NGR renders current-sensing ground-fault protection inoperative and could result in a false belief that the system is functioning properly. 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, see the SE-330AU.

The SE-330 New Revision provides these additional features:

  • 100 trip records with date and time stamp
  • A mini-USB interface to view measured values, configure settings and check event records using SE-MON330 v3.2 or later
  • An on-board microSD card (included) can be used for long term data logging and firmware upgrades
  • Ground-fault trip level is adjustable from 2 to 100% in 10 discrete settings, and in 1% increments when using the MEM setting and SE-MON330 v3.2 or later
  • Dual Ethernet ports are optionally available with support for fiber and RJ45 interfaces
  • IEC 61850 protocol is optionally available
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Product Literature


Property (Mouseover for details) Value
Analog Output Current mA 4 - 20
Communications USB; IEC61850 (RJ45 and SC Fiber)
Relay Contacts Config 2 Form A; 2 Form C
Supply Voltage ac 65 - 265
Supply Voltage dc 85 - 275
New Rev Avail Now
Old Rev Avail No longer available
IEEE Device Numbers 50G - 50N - 51G - 51N - 59N - 86
Relay Contacts Operation Fail-safe / Non Fail-safe
Dimensions 8.4 H x 3.9 W x 5.8 D in.
Weight (lbs/g) 0 Kg
Auto Manual Reset Latching; Autoreset
Conformally coated Standard
Frequency 50; 60; ASD
GF Trip Level Range pct 2 - 100% of CT-Primary Rating
GF Trip Time s 0.1 - 10.0
Harmonic Filtering Standard (DFT)
Reset Type Front-panel switch/Remote N.O. Contact
RF Trip Level V 100 - 10000 (systems up to 35 kV); 200 - 20000 (72 kV systems)
RF Trip Time s 12
System type Resistance Grounded AC

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