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earth-leakage protection relay / 1 NO/NC / AC/DC / high-sensitivity
earth-leakage protection relay
EL731 series

... over-temperature protection. EL731 also offers metering capabilities, along with trip settings and a password protected alarm, along with optional network communications. The product is also used to add low-level ground-fault ...

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Littelfuse
level protection relay / for generators
level protection relay
PGR-4300 series

The PGR 4300 is a generator protection relay by Littlefuse. The unit functions as a simple device for alarming that the condition is ground fault without using any transformers. Using this, it makes the ...

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Littelfuse
arc flash protection relay / 1 NO/NC / programmable / DIN rail
arc flash protection relay
AF0500 series

The AF0500 is a microprocessor-based arc-flash protection relay that limits arc-fault damage by detecting the light from an arc flash and rapidly tripping the feeder breaker. The unit is well suited for ...

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Littelfuse
over-voltage protection relay / AC/DC / DIN rail
over-voltage protection relay
Series 9079

Series 9079 Over-voltage protectors for applications up to 100 V DC, or 75 V AC based on varistor technology are available as single components.

thermal protection relay / automatic reset / three-phase / contactor mount
thermal protection relay
Z

Tripping current: 0 A - 250 A

The Z product has protection during overload and phase loss. Mounted directly on contactor DIL M up to 250 A, or separately mounted, its auxiliary contacts switch off the motor protection and indicate ...

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Eaton
thermal protection relay / automatic reset / three-phase / contactor mount
thermal protection relay
ZEB series

Tripping current: 0.33 A - 175 A

... tripping classes give optimum protection at differing starting solutions. The motor protection relay can be mounted directly on the contactor DILM, resulting in saving space in the control ...

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Eaton
overload relay / temperature / 1 NC / three-phase
overload relay
EMT series

... circuit and zero-voltage safety to ensure reliable fault signalling during supply voltage failure. The EMT 6-DKB can suitably used for every thermistor application for simplified selection, engineering and stock-keeping. ...

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Eaton
thermal protection relay / phase loss / for motors / manual reset
thermal protection relay
TI 9C-5 series

Tripping current: 3.2 A - 4.8 A

... 9C-5, Thermal overload relaysThermal overload relay TI 9C-5 is used with minicontactor CI 5 – for protection of squirrel cage motors where compactness is required. The relay have single ...

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Danfoss Industrial Automation
thermal protection relay / compact / motor / manual reset
thermal protection relay
TI C 16-30 series

Tripping current: 0.13 A - 32 A

TI C (16-30 series), Thermal overload relaysThe thermal overload relays TI 16C-30C cover the range from 0.13-32 Amp and protect squirrel cage motors of up to 15 kW against overload. The phase failure function accelerates ...

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Danfoss Industrial Automation
thermal protection relay / compact / for motors / manual reset
thermal protection relay
TI 80-86 series

Tripping current: 16 A - 85 A

TI (80-86 series), Thermal overload relaysThe thermal overload relays TI 80-86 cover the range from 16-85 Amp and protect squirrel cage motors of up to 45 kW against overload. For use with contactors CI 32 to CI 86 Compact ...

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Danfoss Industrial Automation
safety protection relay / with guided contacts
safety protection relay
G7SA series

Tripping current: 6 A

Relays with forcibly guided contactsThe slim G7SA relay family with forcibly guided contacts is available as a four or six-pole type in various contact combinations and offers reinforced insulation. Terminals ...

safety protection relay / compact
safety protection relay
G7S series

Tripping current: 6, 10 A

Relays with forcibly guided contactsThe slim G7S-_-E relay family with forcibly guided contacts is available as a six-pole type in two different contact combinations. Terminals are arranged for easy PCB ...

differential protection relay / earth-leakage / digital
differential protection relay

The X...DB3 series earth leakage relays type B are designed to measure the DC, AC and high frequency leakage current. Thanks to their distinctive feature (the displaying of the leakage current) it is possible to continuously ...

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FRER
earth-leakage protection relay / panel-mount / DIN rail / digital
earth-leakage protection relay
X72DD

The X...DD series earth leakage relays are designed to measure the leakage or unbalance currents caused by conductors or appliances insulation losses and to react, in case the set limits are exceeded, switching off the ...

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FRER
earth-leakage protection relay / panel-mount / DIN rail / digital
earth-leakage protection relay
X96DD

The X...DD series earth leakage relays are designed to measure the leakage or unbalance currents caused by conductors or appliances insulation losses and to react, in case the set limits are exceeded, switching off the ...

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FRER
motor protection relay / power
motor protection relay

emergency stop protection relay / safety
emergency stop protection relay
SAFEMASTER | UF 6925

... emergency stop module UF 6925 of the SAFEMASTER series monitors safety functions such as emergency stop or safety door safely and simply in nearly every application and is characterised by maximum safety ...

arc flash protection relay / 4 NO / AC/DC
arc flash protection relay
1728

The 1728 model assembled by Tec Automatismes, is a monostable fast acting electromechanical relay that features a 4 RT 10A contact. This device consists of a ≤4ms coil energization closing make contact. Moreover, its ...

4 NO/NC protection relay / panel-mount / AC/DC
4 NO/NC protection relay
EPRA

The EPRA Latching relay consist of a magnetic hold function that can be plugged on a socket. It features a contact of 4RT -7A and a coil of 12-24-48-125-230V AC/DC 380 VAC. The product provides a climatic protection ...

voltage protection relay / 2 NO/NC / panel-mount / AC/DC
voltage protection relay
EPK

... series flashing relay with fixed rhythm features two RT contacts up to 5 A, a coil from 12 to 230 V DC, or 12 to 380 V AC, with flashing frequency from 60 to 120 beates/min at rV. It also contains a pluggable-on socket, ...

earth-leakage protection relay / differential / adjustable / electronic
earth-leakage protection relay
RG1M series

WG series electronic differential protection relay for connection to external WG / WGS / WGC series toroidal transformers These are highly reliable electronic relays with the option ...

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CIRCUTOR
earth-leakage protection relay / adjustable / modular / electronic
earth-leakage protection relay
RGE series

Electronic earth leakage protection relay, used to connect to the earth leakage transformers WG / WGC Series These electronic relays offer a high reliability, with the option of a ...

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CIRCUTOR
earth-leakage protection relay / DIN rail / programmable / digital
earth-leakage protection relay
CBS4 series

Unit equivalent to 4 earth leakage protection networks. 4 independent programmable relays available Four inputs to connect the external toroidal transformers of the WG Superimmunized Type A relay ...

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

Tripping current: 0.3 A - 30 A

... and prepared software for 4 main protection groups as feeder protection, transformer protection, motor protection and busbar protection. Every groupd ...

thermal protection relay / under-voltage / over-voltage / earth-leakage
thermal protection relay
FPC 400

Tripping current: 1, 5 A

FPC 400 is a family of current and 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 ...

over-current protection relay / synchronization / programmable / configurable
over-current protection relay
SEL-311L

... Line Current Differential Relay with integral four zone distance backup for easy-to-apply, high-speed line protection. Apply subcycle current differential protection with included four ...

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Schweitzer Engineering Laboratories
current protection relay / programmable / configurable / digital
current protection relay
SEL-387L

SEL-387L Line Current Differential Relay Ordering Information Online Product Configuration Use SEL-387L Line Current Differential Relays for economical, easy-to-apply line protection

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Schweitzer Engineering Laboratories
phase protection relay / high-voltage / configurable / programmable
phase protection relay
SEL-321

SEL-321 Phase and Ground Distance Relay The SEL-321 Relay delivers outstanding EHV protection, performance, and features—at a price practical for all voltage levels and with the ...

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Schweitzer Engineering Laboratories
over-current protection relay / phase sequence / panel-mount / digital
over-current protection relay
SIA B

... Dual & Self Powered Overcurrent Protection Relay using the operating current through three specific current transformers fitted on the lines. These transformers are also used to obtain ...

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FANOX ELECTRONIC
over-current protection relay / trip circuit / panel-mount
over-current protection relay
SIA-C

The SIA-C is an Overcurrent Protection Relay with SELF-POWERED and Dual Powered (self+auxiliary) models. The relay SIA-C gets its supply from the current lines through ...

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FANOX ELECTRONIC
earth-leakage protection relay / adjustable / modular / electronic
earth-leakage protection relay
DM30

... is composed of multirange electric modular relays. It is specifically designed for direct pulse currents. Its delay time and sensitivity can be adjusted, with near-immunity to external interruptions. The relay ...

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FANOX ELECTRONIC
over-current protection relay / safety / 1 NC / 2 NO
over-current protection relay
MCR-225

... reinforcement via feedback loop Y1 - Y2 Over-current and short-circuit proof Realisation of several safety applications Technological and economical optumum Safety TypIII-C according to EN 574 Category ...

earth-leakage protection relay / current / electronic / digital
earth-leakage protection relay
ELR-3A

Earth Differential Relay Type A • earth leakage current measurement by external toroidal gearbox • measurement in true effective value (trms) • programming and display via a backlit LCD display - fault current (red ...

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Contrel elettronica
earth-leakage protection relay / current / programmable / digital
earth-leakage protection relay
ELR-3B

... Monitor device Type B. Associated to external core balance transformer the CTB-1/xxx family. It has 2 programmables outputs relays. Main trip and prealarm signal. It has one free voltage input for external TRIP/RESET. ...

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Contrel elettronica
power protection relay / 1 NO/NC / differential
power protection relay
ELR-1D

• Earth leakage relay type A • External toroidal • Green power LED indicator (ON) • Red relay tripped LED indicator (TRIP) • Front TEST and RESET buttons • Modular DIN housing, 1 module, with transparent ...

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Contrel elettronica
overload relay / digital
overload relay
TRM-25

Tripping current: 0.1 A - 25 A

This overload devices are designed to prevent the loads getting harm from high currents and ability of control at the same time.

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Tense
voltage protection relay / time delay / adjustable / DIN rail
voltage protection relay
UVR-10

Under Voltage Relay - Delay Time Adjustable UVR-10 Under Voltage Relay is designed for preventing threephase devices to get harmed from long-term voltage fluctuations.

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Tense
overload relay / DIN rail / three-phase / automatic reset
overload relay
KON-TER 25

Tripping current: 1 A - 25 A

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Tense
over-voltage protection relay / under-voltage / DIN rail / single-phase
over-voltage protection relay
600VPR-1

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SELEC Controls Pvt. Ltd.
over-voltage protection relay / under-voltage / phase sequence / DIN rail
over-voltage protection relay
600VPR

... under-voltage and over-voltage protection relay that can be installed in a standard DIN rail measuring 17.5 mm. It is integrated with three wire inputs that cater to wires with a diameter of 3 mm. This ...

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SELEC Controls Pvt. Ltd.
over-voltage protection relay / under-voltage / phase sequence / phase loss
over-voltage protection relay
900VPR-2

... frequency monitoring, - Asymmetry , phase failure & phase sequence monitoring, - RMS value measurement, - Two separate alarm relays

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SELEC Controls Pvt. Ltd.
motor protection relay / current
motor protection relay
MS32 series

Motor Protection Switches - MS32 Versions Professional range of motor protection switches from the MS32 series. The switches can be either vertically or horizontally mounted onto 35 mm DIN Rail. The ...

level protection relay / DIN rail
level protection relay

Managing water and conductive liquids are an essential part of modern societies illustrated in water plants, factory production processes, agriculture irrigation, pools,.. Pumps are the core of liquid flow systems and they require efficient control ...

level protection relay / DIN rail
level protection relay
MP

Tripping current: 0.63 A - 1 A

phase unbalance protection relay / phase loss / DIN rail / for motors
phase unbalance protection relay

Aimed to protect motors where phase sequence is specially relevant (lifts, cranes, escalators,..) or phase failure can be specially damaging.

earth-leakage protection relay / digital / differential / panel-mount
earth-leakage protection relay
DER3BDUAL/2I

Tripping current: 0.05 A - 7 A

DER3B DUAL – UNIVERSAL relay type B. Dossena presents the new DER3B DUAL series, the new generation of earth differential relays. The earth differential relays DER3B DUAL series ...

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DOSSENA
earth-leakage protection relay / DIN rail / digital / AC/DC
earth-leakage protection relay
DER3BDUAL/6D

Tripping current: 0.05 A - 7 A

DER3B DUAL – UNIVERSAL relay type B. Dossena presents the new DER3B DUAL series, the new generation of earth differential relays. The earth differential relays DER3B DUAL series ...

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DOSSENA
current protection relay / earth-leakage / DIN rail / IEC
current protection relay
DER3/0D

Tripping current: 0 A - 30 A

... regulations. With this design, it meet the expectation to have a double need which are the safety of facility and the continuous service of industrial production. The relay consist of one intervention ...

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DOSSENA
current protection relay / differential / Ethernet
current protection relay
ALP series

Tripping current: 100 mA - 100,000 mA

The ALP series covers differential protection and accounts for current transformer errors by providing a two slope differential setting characteristic. The events of transformer ultrasaturation during inrush and very ...

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Gentec
voltage protection relay / Ethernet
voltage protection relay
ALP series

Tripping current: 100 mA - 100,000 mA

The ALP series covers directional protection and accounts for loss of voltage in case of a fuse failure in a voltage transformer. Provides directional overcurrent protection ...

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Gentec
frequency protection relay
frequency protection relay
ALP series

Tripping current: 100 mA - 100,000 mA

The ALP series covers frequency protection for underfrequency, overfrequency and rate of change of frequency (ROCOF). Precise frequency calculation (±0.001 Hz) Provides one additional voltage input for validation ...

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Gentec
over-current protection relay / over-voltage / under-current / under-voltage
over-current protection relay
24 - 240 V, 1 - 5 A | PAU series

... level Imin, the protector will trip and the red LED will illuminate indicating the fault condition. During the time delay period the red LED will flash for the set time (t) before the relay de-energises output ...

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Crompton Instruments
over-current protection relay / over-voltage / under-current / under-voltage
over-current protection relay
24 - 240 V, 1 - 5 A | PAO series

... level Imax, the protector will trip and the red LED will illuminate indicating the fault condition. During the time delay period the red LED will flash for the set time (t) before the relay energises ...

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Crompton Instruments
over-current protection relay / over-voltage / under-current / under-voltage
over-current protection relay
24 - 240 V, 1 - 5 A | PAD - PAP series

... output relays • Three module version Under or Over Current - PAP/V • Three-phase, three/four-wire • Continuously monitors to provide under or over protection (set level In) • Monitors three-phase current • ...

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Crompton Instruments
over-current protection relay / earth-leakage / phase / digital
over-current protection relay
IPR-A

... Instantaneous overcurrent (ANSI 50). - Instantaneous ground overcurrent (ANSI 50N/50G). - Overload alarm adjustment to one level. - Accumulated KA per phase on breaker interruption. - 1 trip relay ...

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Orion Italia
current protection relay / panel-mount / digital / programmable
current protection relay
IPR-D

... Extremely inverse. Definite time. - Instantaneous ground overcurrent (ANSI 50N/50G). - Overload alarm adjustment to one level. - 1 trip relay and 1 alarm relay. - Loss of control ...

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Orion Italia
earth-leakage protection relay / programmable / DIN rail / digital
earth-leakage protection relay
RD

The Earth Leakage Relay RD is a microprocessor-based electronic protection device designed to recognize low-level leakage or unbalanced currents, due to insulation loss on conductors or equipment to be ...

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Orion Italia
overload relay
overload relay
TH-P18(R)(S)

Tripping current: 0.25 A - 21 A

... #9678;Type:  2 elements:TH-P18(R)(S)  3 elements:TH-P18E(R)(S)  Phase Failure Protection:TH-P18PP(R)(S)  ※「R」:installion base;「S」:terminal ...

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Shihlin Electric & Engineering Corporation
overload relay
overload relay
TH-P400CT(S)

Tripping current: 105 A - 350 A

... Type:  Two Elements:TH-P400CT(S)  Therr Elements:TH-P400ECT (S)  Phase Failure Protection:TH-P400CTPP(S)  ※「S」:terminal cover ◎Heater ...

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Shihlin Electric & Engineering Corporation
overload relay
overload relay
TH-P220CT(S)

Tripping current: 80 A - 200 A

... Type:  Two Elements:TH-P220CT(S)  Three Elements:TH-P220ECT (S)  Phase Failure Protection:TH-P220CTPP(S)  ※「S」:terminal cover ◎Heater ...

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Shihlin Electric & Engineering Corporation
phase loss protection relay / AC
phase loss protection relay
120 - 575 V | 1000 series

... by TE, is a sensor and protective relay that is ideally used in an AC actuating system and is equipped with a protective relay type. This device has an input voltage ...

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TE Connectivity - Schrack Relays
paralleling protection relay / for generators
paralleling protection relay
120 - 575 V | 1800 series

The 1800 series engineered by TE Connectivity, is a generator paralleling relay that features a dual dead bus mechanism and a protection function. In addition, this apparatus operates in a 120 VAC input voltage.

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TE Connectivity - Schrack Relays
frequency protection relay
frequency protection relay
55 - 66 Hz, 120 - 240 V | 20-000 series

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 Connectivity - Schrack Relays

How to choose this product

protection-relay

A protection relay shuts off a machine operating in a way that represents a potential risk to itself.

Applications

These devices supervise the operation of a machine or other installation by measuring current, voltage or phase variations. It shuts off the machine, cuts off power to an installation or triggers an alarm when a parameter exceeds authorized thresholds.

Technologies

As with other relays, electromechanical models exist, though most now are semiconductor-based solid state relays. Some are directly programmable and are in ISO cases for rail installation.

How to choose

Choice of a protection relay depends on the monitored parameters: overcurrent, zero velocity, excessive speed, current consumption, leaks, etc.