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SE-325 SERIES (PGM-8325)

SE-325 SERIES (PGM-8325)

Product catalog summary

Description
The SE-325 Neutral-Grounding-Resistor Monitor is designed for resistance-grounded systems up to 25 kV. It monitors the integrity of the neutral-to-ground path and detects ground faults by measuring current and voltage in a transformer or generator neutral-to-ground connection, as well as the continuity of the neutral-grounding resistor (NGR). It provides an alarm or trip output contact upon detecting issues such as loose connections, corrosion, ground faults, or NGR failure.

Ordering Information
The SE-325 series is available in different models based on control power requirements: SE-325 (120 Vac), SE-325D (120 Vac/Vdc), and SE-325E (240 Vac).

Features & Benefits

Continuous NGR monitoring detects resistor failure quickly, reducing transient-overvoltage risk and ground-fault-detection failure.
Ground-fault detection provides main or backup protection for the monitored system.
Adjustable pickup (0.5 - 4 A) and time delay (0.1 - 2 s) allow for system coordination and sensitivity adjustment.
Output contacts are Form A with selectable fail-safe or non-fail-safe operating modes.

Specifications

IEEE Device Numbers: Ground Fault (50G/N, 51G/N), Overvoltage (59N), Lockout Relay (86), Checking Relay (3).
Input Voltage: Refer to ordering information.
Dimensions: H 150 mm (5.9"), W 109 mm (4.3"), D 100 mm (4.0").
GF Trip Level Settings: 0.5-4.0 A.
GF Trip Time Settings: 0.1-2.0 s.
RF Trip-Level Settings: 20-400 Vac (≤5 kV systems), 100-2,000 Vac (>5 kV systems).
Contact Operating Mode: Selectable fail-safe or non-fail-safe.
Reset Button: Standard feature.
Output Contacts: Form A.
Approvals: CSA certified, UL Listed (E340889), C-Tick (Australian).
Conformally coated: Standard feature.
Warranty: 5 years.
Mounting: Surface.

Accessories

CT200 Series Current Transformer: Required for detecting ground-fault current.
ER Series Sensing Resistor: Required interface to eliminate hazardous voltage levels at the monitor.
RK Series Remote Indication and Reset: Optional panel-mounted assemblies available in NEMA 1 or NEMA 4 configurations.

Catalog excerpts

Neutral-Grounding-Resistor Monitoring Neutral-Grounding-Resistor Monitor Expertise Applied | Answers Delivered Description The SE-325 Neutral-Grounding-Resistor Monitor is used on resistance-grounded systems up to 25 kV to monitor the integrity of the neutral-to-ground path and to detect ground faults. It measures current and voltage in a transformer or generator neutral-to-ground connection and continuity of the neutral-grounding resistor (NGR). The SE-325 coordinates these three measurements to detect a loose connection, corrosion, ground fault, or NGR failure, and provides one alarm or trip output contact. Features & Benefits FEATURES Detects resistor failure within seconds, reduces transient-overvoltage risk, removes risk of ground-fault-detection failure Simplified Circuit Diagram Ground-fault Main or backup protection to detect a ground Detection fault anywhere on the monitored system Adjustable pickup Select greatest sensitivity without AM^sb^ time delay Adjustable trip delay allows system coordination Ordering Information ORDERING NUMBER Consult manual online for additional ordering options. IEEE Device Numbers Input Voltage Dimensions GF Trip Level Settings GF Trip Time Settings RF Trip-Level Settings Contact Operating Mode Reset Button Output Contacts Approvals Conformally coated Ground Fault (50G/N, 51G/N), Overvoltage (59N), Lockout Relay (86), Checking Relay (3) 100-2,000 Vac (>5 kV systems) Selectable fail-safe or non-fail-safe Standard feature Form A CSA certified, UL Listed (E340889), C-Tick (Australian) Standard feature 5 years Surface © 2016 Littelfuse Protection Relays & Controls Littelfuse.com/se-325

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SE-325 SERIES (PGM-8325)

SE-325 SERIES (PGM-8325)

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