Protection relays

86 companies | 515 products
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safety protection relay
safety protection relay

Industrial safety relays provide an interface between safety devices and the machines and processes those devices monitor for an easy-to-use safety control solution.

over-voltage protection relay
over-voltage protection relay
9079 series

... frequency surge voltages e g occurring dunng réguler electric railway operation along railway lines They provide sufficient safety even in the worst case scénario if the overhead high voltage lines fall to the ground Applications DC ...

thermal protection relay
thermal protection relay

Mitsubishi Electric offers AC and DC controlled Contactor Relays with multiple open and closed contacts configurations that can be used in a variety of applications. They are suitable for alarms and sensors, signal switching, ...

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MITSUBISHI Automation
earth-leakage protection relay
earth-leakage protection relay
EL731 series

Trigger voltage: 120, 240, 24, 48 V

... 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
level protection relay
PGR-4300 series

Trigger voltage: 120, 12, 24 V

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
arc flash protection relay
AF0500 series

Trigger voltage: 100, 240, 110, 250 V

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
overload relay
overload relay
PISA11.401

Tripping current: 1 A
Trigger voltage: 24 V

This protection module fulfills two basic functions. First it distributes the current of a large power source to four lower current output channels and therefore allows for smaller wires to be used. The second function ...

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PULS GmbH
thermal protection relay
thermal protection relay
TI 9C-5 series

Tripping current: 1.8 A - 2.8 A

... series of thermal overload relays are ideal for protection of squirrel-cage motors when used with the contactor range CI4 - CI86. TI 180E and TI 630E electronic motor protection relays ...

thermal protection relay
thermal protection relay
TH series

Trigger voltage: 690 V

Motor protection relays that protect your motor against burnout. Can be used for protection against motor burnout during overload or locked rotor. Offers a wide range of functions, including ...

thermal protection relay
thermal protection relay
ZEB, Z series

... functional safety and service life of a motor depend mainly on the motor protection. From attractively priced bimetal options to full motor protection with networking options, Eaton offers ...

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Eaton
thermal protection relay
thermal protection relay
TH-N Serie

Motor protection relays that protect your motor against burnout. Can be used for protection against motor burnout during overload or locked rotor. Offers a wide range of functions, including ...

earth-leakage protection relay
earth-leakage protection relay
RED

Schneider Electric RED Multi 9 automatic recloser for earth leakage protection is suitable for phase-to-neutral networks and TT or TN earthing systems. The device has 2 poles, rating of 25 to 63 A, and sensitivity of ...

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Schneider Electric - Electrical Distribution
overload relay
overload relay
RW_E series

Tripping current: 0.4 A - 420 A
Trigger voltage: 690, 1,000 V

The RW_E is meant to assure increased reliability for protection of low voltage three-phase electric motors in sinusoidal 50/60 Hz networks where reliability, low power dissipation and ease maintenance management are ...

thermal protection relay
thermal protection relay
TI 9C-5

Tripping current: 0.13 A - 0.2 A

... Identical product 047H4060 Packing format Multi pack Product description Thermal Overload Relay Product group Contactors and motor starters Product name Overload relay Quantity per packing format ...

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Danfoss Industrial Automation
thermal protection relay
thermal protection relay
TI 16C

Tripping current: 0.13 A - 0.2 A

... Identical product 047H4200 Packing format Multi pack Product description Thermal Overload Relay Product group Contactors and motor starters Product name Overload relay Quantity per packing format ...

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Danfoss Industrial Automation
thermal protection relay
thermal protection relay
TI 80

Tripping current: 60 A - 80 A

... starter [A [Min] 105 A Packing format Multi pack Product description Thermal Overload Relay Product group Contactors and motor starters Product name Overload relay Quantity per packing format 10 ...

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Danfoss Industrial Automation
differential protection relay
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
current protection relay
current protection relay
X35DB3

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
current protection relay
current protection relay
X48DB3

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

... emergency stop module UF 6925 is suitable to protect men and machine by safety related enabling or disabling of a safety circuit. It is used in applications with e-stop buttons and safety ...

phase protection relay
phase protection relay
RX-5

Tripping current: 1 A - 1,000 A
Trigger voltage: 0 V - 600 V

RX Motor Protection Relay Take your motor protection to a new level. The RX Series provides more than just solid state overload or power protection relays. ...

earth-leakage protection relay
earth-leakage protection relay
SIA B

Trigger voltage: 230, 24, 110 V

... powered Overcurrent and Earth Fault Protection Relays, using the operating current through three specific current transformers fitted on the lines. Thanks to this adaptation the SIA-B ...

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FANOX ELECTRONIC
over-current protection relay
over-current protection relay
SIA-B Standard CT's

Trigger voltage: 24 V - 230 V

... IN PROTECTION SOLUTIONS. Advanced OC&EF Self-Powered Protection Relay SIA B with Standard CT’s, is an overcurrent protection relay ...

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FANOX ELECTRONIC
earth-leakage protection relay
earth-leakage protection relay
SIA-C

SIA-C Relays are Dual & Self powered overcurrent and earth fault Protection Relays, that obtein the energy to power itself tanks to STANDARD CURRENT TRANSFORMES on the ...

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FANOX ELECTRONIC
earth-leakage protection relay
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
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
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
motor protection relay
motor protection relay

over-current protection relay
over-current protection relay
MCR-225

Trigger voltage: 230 V

... 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 ...

trip circuit protection relay
trip circuit protection relay
GMP series

Multi-Protection Wide and adjustable current setting range Adjustable trip time (trip class 5-10-15-20-30) Various connection way Screw connection & Separate mount, Direct mount, Passing through CT holes & Separate mountable ...

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LS Industrial Systems
safety protection relay
safety protection relay
D1180D

FLAMMABLE LIQUID PRESENCE DETECTOR INTERFACE RELAY OUTPUT DESCRIPTION The Flammable Liquid Presence Detector Interface type D1180D is a DIN Rail unit configurable with two isolated independent channels. The unit can ...

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GM International srl
safety protection relay
safety protection relay
D5000 series

Tripping current: 4, 10 A
Trigger voltage: 24 V

... common circuitry. Single channel versions available if required, to provide single loop integrity on Emergency Shut Down and Fire & Gas applications. Configuration components are easily accessed by removing cover. DIP ...

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GM International srl
safety protection relay
safety protection relay
D5093D

... :2010 Ed.2) in safety related systems for high risk industries. Each channel is able to reflect the presence of a 24 to 220 Vac/Vdc input signal to the output by closing an optically coupled NO open-drain transistor ...

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GM International srl
power protection relay
power protection relay
ELR-1D

Trigger voltage: 24, 48, 110, 230 V

• 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
1 NO/NC protection relay
1 NO/NC protection relay
ELR-D2-V

Trigger voltage: 110, 240 V

... leakage relay with 2 operation thresholds, 2 module, external ct, LCD display, RS485 communication interface. GENERAL CHARACTERISTICS • True RMS • Earth leakage relay type A • External toroidal • ...

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Contrel elettronica
earth-leakage protection relay
earth-leakage protection relay
ELR-3A

Trigger voltage: 240 V

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
overload relay
overload relay
TRM-400

Tripping current: 290 A - 400 A

Digital thermal relays are designed to prevent and control loads from damage due to high current. 290A - 400A (Adjustable Overload Value) Error Delay Time Adjustable Operation Mode Adjustable (Automatic, ...

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Tense
overload relay
overload relay
TRM-10

Tripping current: 0.1 A - 10 A

Digital thermal relays are designed to prevent and control loads from damage due to high current. 40A - 100A (Adjustable Overload Value) 50% Fixed Current Asymmetry Error Delay Time Adjustable Operation ...

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Tense
overload relay
overload relay
TRM-300

Tripping current: 190 A - 300 A

Digital thermal relays are designed to prevent and control loads from damage due to high current. 190A - 300A (Adjustable Overload Value) 50% Fixed Current Asymmetry Error Delay Time Adjustable Operation ...

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Tense
phase unbalance protection relay
phase unbalance protection relay
SFE2/4 series

SFE2/4 SERIES PHASE SEQUENCE RELAY - Compact Size - 1 Module ( 17,5mm) - Phase sequence / Rotation control - Universal three phase supply 3x200-450VAC - Din rail mounting - 1 Exchange contact Typical application ...

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EL.CO.
earth-leakage protection relay
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
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
current protection relay
DER3/0D

Tripping current: 0.03 mA - 30,000 mA

... 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

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.