Under-frequency protection relays

11 companies | 16 products
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over-voltage protection relay / under-voltage / phase sequence / phase loss
over-voltage protection relay
900VPR-2

Trigger voltage: 280 V - 520 V

3Ø-Digital Voltage Protection Relay, Self Powered [900VPR-2-280/520V] Measuring Parameter Under Voltage, Over Voltage, Under Frequency, Over Frequency, Phase Asymmetry, Phase Failure, Phase Sequence Electrical Connection 3Ø-3W, 3Ø-4W Display ...

over-voltage protection relay / under-voltage / phase sequence / phase loss
over-voltage protection relay
900VPR-BL-U-CE

Trigger voltage: 250 V

3Ø-Digital Voltage Protection Relay, Auxillary Supply [900VPR-BL-U-CE] Measuring Parameter Under Voltage, Over Voltage, Under Frequency, Over Frequency, Phase Asymmetry, Phase Failure, Neutral Loss, Phase Sequence Electrical Connection ...

electric motor protection relay / over-voltage / earth-leakage / overload
electric motor protection relay
7UM6 series

The SIPROTEC 7UM6 protection relays have been specially developed and designed for the protection of generators of all sizes and synchronous and asynchronous motors. With the high-performance DIGSI 4 engineering tool, the SIPROTEC 4 devices ...

current protection relay / excitation loss / over-voltage / under-voltage
current protection relay
DGP

The digital system of DGP is a perfect choice for providing safety, security, monitoring, recording, and controlling various functions of AC generators. This digital system can be deployed over generators that are run by gas, steam, hydraulic ...

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GE Grid Solutions
under-frequency protection relay / over-frequency / DIN rail / single-phase
under-frequency protection relay
PHD series

Trigger voltage: 87 V - 550 V

The Frequency protector set point adjustment range is centred around the nominal system frequency of 50, 60 or 400Hz. The adjustable differential setting can be used to reduce nuisance tripping if the measured signal is noisy or unstable. ...

under-current protection relay / over-voltage / earth-leakage / temperature
under-current protection relay
FPC 200, Protection relay

Tripping current: 0.3 A - 30 A

FPC 200 is a current or voltage digital protection relays with easy to use interface meant for variety of solutions in industry and power distribution. Its robust design enables it to be placed even in demanding industrial environments. ...

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Iskra d.d.
under-frequency protection relay / over-frequency / single-phase
under-frequency protection relay
20-050-2X

Tripping current: 5 A
Trigger voltage: 120 V

The 20-050-2X is a sensor and protective relay that is ideally used in an AC actuating system. It has an input voltage of 120 VAC and an over or underfrequency protection function.

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TE Relays, Contactors & Switches
over-voltage protection relay / under-voltage / over-current / over-frequency
over-voltage protection relay
SEL-787-3E/-3S/-4X

Transformer Protection Relay Protect and monitor most three- and four-winding transformers and terminals with the versatile SEL-787 Transformer Protection Relay platform. Select SEL-787-3E/-3S models, and apply three-phase current and ...

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Schweitzer Engineering Laboratories
over-voltage protection relay / under-voltage / overload / over-current
over-voltage protection relay
T-PRO 4000

The IEC 61850 station bus embedded T-PRO relay provides complete 3-phase multi-winding transformer fault and overload protection, DFR-quality fault oscillography, sequence of event logging, trend recording, in a fully integrated protective ...

under-voltage protection relay / over-voltage / under-frequency / over-frequency
under-voltage protection relay
SVF5940 series

The relay type SVF5940 is intended for the protection of electric lines and machines against line voltage, frequency and rate of frequency change; it covers all protection requirements from ENEL DK5940 and many other utilities in application ...

over-voltage protection relay / under-voltage / under-frequency / over-frequency
over-voltage protection relay
KPFV51x series

Trigger voltage: 100 V - 480 V

KPFV51x - SINGLE PHASE - FREQUENCY AND VOLTAGE GUARD Under and Over Voltage and Frequency Protection Adjustable Voltage and Frequency Deviation Set points "Pathfinder" function Optional very fast analogue output (<50mS), ...

over-voltage protection relay / under-voltage / over-frequency / under-frequency
over-voltage protection relay
ALP series

Tripping current: 100 mA - 100,000 mA

The ALP series prevents islanding from occurring by combining a series of overvoltage, undervoltage, overfrequency, underfrequency and rate of change of frequency (ROCOF) functions. Detects island and trips associated breaker ...