U.S. Ground
Parcel Shipments
See Shipping Policy

Neutral Grounding Resistors

Neutral Grounding Resistors (NGRs) play a pivotal role in enhancing the safety and reliability of a power system, particularly in an industrial and high-voltage electrical system. Their primary function is to limit the flow of fault current during a ground fault, reducing it to a safe level to protect equipment and personnel. By connecting the neutral point of transformers or generators to the ground through a resistor, NGRs control the fault current in case of a ground fault, preventing the detrimental effects that can arise from uncontrolled fault currents.

Ground fault currents, if not properly managed, can lead to severe damage in electrical equipment and dangerous conditions like arc flashes. Neutral grounding resistors provide ground fault protection by ensuring that the fault current does not exceed a predetermined value, allowing for a controlled and safe operating environment. This is crucial in systems where the neutral is directly grounded.

Neutral Grounding Resistors are part of a broader category of neutral grounding devices, which also include neutral grounding transformers and neutral earthing resistors. These devices are essential in three-phase systems for maintaining the stability of the line to neutral voltage during fault conditions. They work in tandem with protective relays and circuit breakers to quickly identify and isolate the fault point, thereby limiting equipment damage and ensuring continuous operation.

Products

Products Per Page: Sort By:
$12535.20
Littelfuse SE-330HV-28-01 is a high-voltage relay designed for Resistance Grounded AC systems. It offers 1 Form A, 1 Form B, or 2 Form C relay contacts with fail-safe/non-fail-safe operation. The device provides harmonic filtering, front-panel or remote reset options, and support for USB and IEC61850 communication. With a wide voltage range and various trip levels, it meets the needs of different systems. The product is now available in a new revision, while the old revision is no longer offered.
$12535.20
Littelfuse SE-330HV-28-00 is a conformally coated relay with 2 Form A and 2 Form C contacts. It operates in fail-safe or non-fail-safe mode with IEEE device numbers 50G, 50N, 51G, 51N, 59N, and 86. Reset can be done through a front-panel switch or remote N.O. contact. Harmonic filtering is standard. It has a GF trip time range of 0.1-10.0s. The supply voltage is 28-52VAC and 36-72VDC. It is available in latching or autoreset mode. Communications options include USB and IEC61850. It has an analog output current range of 4-20mA. The RF trip level range is 100-10000V for systems up to 35kV and 200-20000V for 72kV systems. The new revision is available now, while the old revision is no longer available. The GF trip level range is 2-100% of CT-primary rating.
$12535.20
Littelfuse SE-330HV-27-01 is a conformed coated device with 1 Form A, 1 Form B, or 2 Form C relay contact configurations. It operates in fail-safe or non-fail-safe mode, with IEEE device numbers ranging from 50G to 86. Reset options include front-panel switch or remote N.O. contact. It offers standard harmonic filtering and latching/autoreset. Communication options include USB and IEC61850. It has an analog output current range of 4-20 mA and RF trip levels of 100-10000 V (up to 35 kV) or 200-20000 V (72 kV systems). It supports resistance grounded AC systems, with supply voltages of 28-52 V AC and 36-72 V DC. It has a GF trip level range of 2-100% of CT-Primary Rating. New revision is available now, while the old revision is no longer available.
$12535.20
Littelfuse SE-330HV-27-00 is a conformally coated relay with 2 Form A and 2 Form C contacts. It operates in fail-safe or non-fail-safe mode and has IEEE device numbers 50G-50N-51G-51N-59N-86. It can be reset using a front-panel switch or a remote N.O. contact. The supply voltage ranges from 28-52V AC and 36-72V DC. It offers USB and IEC61850 communication options, as well as analog output current and RF trip level adjustments. The new version is now available, while the old version is no longer available.
$12535.20
Littelfuse SE-330HV-26-01 is a conformally coated relay device suitable for resistance grounded AC systems. It offers various relay contact configurations, fail-safe/non-fail-safe operation, front-panel or remote reset options, and standard harmonic filtering. The device supports multiple communication options and has a wide supply voltage range. It also provides analog output and RF trip level options.
$12535.20
Littelfuse SE-330HV-26-00 is a versatile relay module suitable for various system types. It features fail-safe/non-fail-safe relay contacts and offers both front-panel switch and remote N.O. contact reset options. The module also includes standard conformal coating, harmonic filtering, and communication options like USB and IEC61850. With a wide supply voltage range and selectable GF trip levels, it ensures reliable performance for different applications.
$11705.89
Littelfuse SE-330HV-25-01 is a conformed coated device capable of frequency operation at 50Hz, 60Hz, and ASD. It features relay contacts configuration of 1 Form A, 1 Form B, or 2 Form C, with fail-safe or non-fail-safe operation. The device supports IEEE device numbers 50G, 50N, 51G, 51N, 59N, and 86. It offers front-panel or remote N.O. contact reset options and includes standard harmonic filtering. The system type is resistance grounded AC, with supply voltages ranging from 28-52V AC and 36-72V DC. The device is available with latching or autoreset options, and supports communication through USB or Ethernet (Dual SC Fiber). It provides analog output current of 4-20mA and RF trip levels of 100-10000V for systems up to 35kV or 200-20000V for 72kV systems. The new revision is available now, while the old revision is no longer available. The GF trip levels range from 2-100% of CT-Primary Rating.
$11705.89
Littelfuse SE-330HV-25-00 is a conformally coated relay device designed for resistance grounded AC systems. It features 2 Form A and 2 Form C relay contacts with fail-safe/non-fail-safe operation. It supports IEEE Device Numbers 50G, 50N, 51G, 51N, 59N, and 86. With a reset option of front-panel switch or remote N.O. contact, it provides standard harmonic filtering and has a wide range of supply voltage options. It offers auto manual reset and supports USB and Ethernet communication. The RF trip level ranges from 100 to 10000 V for systems up to 35 kV and 200 to 20000 V for 72 kV systems. This updated version is available now, while the older version is no longer available.
$11705.89
Littelfuse SE-330HV-24-01 is a frequency selectable relay system with various contact configurations and reset options. It offers thermal overload protection and conforms to industry standards. It supports resistance grounded AC systems and has multiple supply voltage options. The system features USB and Ethernet communications for easy integration. Available now.
$11705.89
Littelfuse SE-330HV-24-00 is a conformally coated protection relay with 2 Form A or 2 Form C relay contacts. It operates in both fail-safe and non-fail-safe modes and is suitable for resistance grounded AC systems. It offers front-panel or remote reset options, standard harmonic filtering, and multiple communication options. Other features include adjustable trip times, wide supply voltage range, analog output current, and RF trip level options. Upgraded version available now, old version discontinued.
$11705.89
Littelfuse SE-330HV-23-01 is a conformally coated frequency relay with multiple relay contact configurations and fail-safe/non fail-safe operation. It features front-panel and remote N.O. switch reset options, standard harmonic filtering, and resistance grounded AC system compatibility. With a wide range of supply voltage options and communication interfaces, it offers versatility and flexibility. The RF trip levels and times ensure fast and reliable protection. Update available now, previous version no longer available.
$11705.89
Littelfuse SE-330HV-23-00 is a conformally coated relay with 2 Form A and 2 Form C contacts. It operates in fail-safe or non-fail-safe mode and is suitable for resistance grounded AC systems. It has a supply voltage range of 28-52V AC and 36-72V DC. Additional features include front-panel/reset switch and remote N.O. contact reset options, USB and Ethernet communication interfaces, and standard harmonic filtering. It is available in various models with different GF trip time and trip level specifications.