Littelfuse SE-330HV-01-00, SE-330HV Series, Neutral-Grounding-Resistor Monitor, 120/240VAC/DC, Communications USB DeviceNet, Normally Open

In stock
SKU: SE-330HV-01-00
Regular price $8,672.26
Rated voltage

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The SE-330 is an advanced ground-fault and neutral-groundingresistor 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 currentsensing 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 standards, use the SE-330AU.
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. DiscreteFourier 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.

Pre-order 6-8 Weeks

IEEE Device Numbers Ground Fault (50G/N, 51G/N, 59N),
Checking Relay (3),
Lockout Relay (86)
Input Voltage 120/240VAC/DC
Dimensions H 213 mm (8.4");
W 98 mm (3.9");
D 132 mm (5.2")
GF Trip Level Settings 2-100% of CT-Primary Rating in 1% increments
GF Trip Time Settings 0.1-10 s
Vn Trip-Level Settings 20-2,000 Vac (≤5 kV systems)
100-10,000 Vac (>5 kV systems)
Contact Operating Mode Selectable fail-safe or non-fail-safe (K1, K2, K3)
Harmonic Filtering Standard feature
Reset Button Standard feature
Output Contacts Two Form A and two Form C
Pulsing Circuit 1.0-3.0 s in 0.2 s increments (SE-330 only)
Approvals CSA certified,
UL Listed (E340889),
CE (European Union),
RCM (Australian)
Communications Mini USB (standard);
DeviceNet (optional),
IEC 61850 (optional),
Modbus TCP and EtherNet/IP (optional)
Analog Output 4-20 mA, self or loop powered
Conformally coated Standard feature
Warranty 5 years
Mounting Panel and Surface (optional)