Littelfuse Startco SE-325 Neutral-Grounding-Resistor Monitor

SE-325 Neutral-Grounding-Resistor Monitor

SE-325 Neutral-Grounding-Resistor Monitor

Functions:

Detects neutral-grounding-resistor failure - NGR failure will render current-sensing ground-fault protection inoperative
Detects ground faults

Features:

Continuously monitors NGR continuity
Conforms to CSA Standard M421-00 Use of Electricity in Mines
Meets the requirements of the Pennsylvania Bureau of Mine Safety
Provides main or backup ground-fault protection
Trip delay to coordinate with downstream ground-fault relays
Selectable fail-safe (undervoltage) or non-fail-safe (shunt) operating mode
LED indication of Ground Fault, Resistor Fault, and Power
Conformally coated circuit boards
Five year warranty

Manuals:

Manual SE-325 (Español)

Typical Applications:

Transformers and generators with a maximum 25-A NGR in processing, manufacturing, chemical, mining, forestry, petroleum, and water-treatment facilities
NGR monitoring is recommended for all resistance-grounded systems
Can be used with a zigzag transformer and an NGR to provide monitored resistance grounding to upgrade an ungrounded supply
Pulsing ground-fault location systems

Minimum System Components:

The SE-325 requires a CT200 current transformer and a sensing resistor (ER-600VC, ER-5KV, ER-15KV, or ER-25KV).
Outdoor Sensing Resistor Applications

IEEE Device Numbers:

50G, 50N, 51G, 51N, 59N, 86

Accessories:

RK-13
Relay Interface Module
Separate ground-fault and ground-check indication contacts for the SE-105 or SE-107; separate ground-fault and resistor-fault indication contacts for the SE-325.

RK-325
Remote Indication and Reset Assembly
Panel-mounted remote indication and reset for the
SE-325. NEMA 1 rating.

RK-302
Remote Indication and Reset Assembly
Panel-mounted remote indication and reset for the SE-325. NEMA 4 and NEMA 13 rating. Standard 22-mm mounting.

RK-325I
Remote Indication Assembly
Panel-mounted remote indication and reset for the
SE-325. NEMA 1 rating.

Current Transformers:

CT200
Current Transformer
Current transformer used to detect phase or ground-fault current.

Sensing Resistors:

ER-600VC
1-kV Sensing Resistor
Used with the SE-325, SE-330, and SE-330AU to continuously monitor the continuity of a neutral-grounding resistor on systems up to 1 kVac.

ER-15KV
15-kV Sensing Resistor
Used with the SE-325, SE-330, SE-330AU, and SE-330HV to continuously monitor the continuity of a neutral-grounding resistor on systems up to 15 kVac.

ER-5KV
5-kV Sensing Resistor
Used with the SE-325, SE-330, and SE-330AU to continuously monitor the continuity of a neutral-grounding resistor on systems up to 5 kVac.

ER-25KV
25-kV Sensing Resistor
Used with the SE-325, SE-330, SE-330AU, and SE-330HV to continuously monitor the continuity of a neutral-grounding resistor on systems up to 25 kVac.