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Protection relays
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![voltage protection relay](https://img.directindustry.com/images_di/photo-m2/7025-18182609.jpg)
Entry-level, yet powerful protection for motors and other electrical assets, finding application in power control centres and switchgear, motor control centres, etc. Complete and reliable protection ...
MITSUBISHI Automation
![thermal protection relay](https://img.directindustry.com/images_di/photo-m2/5067-7749183.jpg)
Tripping current: 250 A
Motor protection is one of the central tasks of the electrical equipment of any machine. The electronically configurable ZEB electronic motor protection relays of the Eaton Moeller series ...
![electric motor protection relay](https://img.directindustry.com/images_di/photo-m2/12491-17299551.jpg)
Tripping current: 0.4 A - 420 A
Trigger voltage: 1,000, 690 V
... the contactors or on an individual base, the RW_E electronic overload relays provide protection for electric motors up to 840 A. Main characteristics •Incorporated protections: overload, ...
![arc flash protection relay](https://img.directindustry.com/images_di/photo-m2/17136-16522136.jpg)
Trigger voltage: 100 V - 240 V
... Series arc-flash relay is a cost-effective solution that reduces arc-fault damage by detecting the light from an arc flash and rapidly tripping. Two remote light sensors can be connected to one relay ...
Littelfuse
![arc flash protection relay](https://img.directindustry.com/images_di/photo-m2/17136-16522055.jpg)
Trigger voltage: 110, 250, 100, 240 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 ...
Littelfuse
![phase protection relay](https://img.directindustry.com/images_di/photo-m2/17136-7163061.jpg)
Trigger voltage: 12, 48, 120, 240 V
... -8800 is a microprocessor-based relay that limits arc-fault damage by detecting the light from an arc flash and rapidly tripping. Phase-current-transformer inputs are provided for current-constrained arc-flash protection ...
Littelfuse
![thermal protection relay](https://img.directindustry.com/images_di/photo-m2/12225-14563579.jpg)
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](https://img.directindustry.com/images_di/photo-m2/25880-19271618.jpg)
Tripping current: 0.16 A - 480 A
Protects motors against overload and locked rotor, securing safe operation. Standard model complies with Japanese and many international standards.
MITSUBISHI ELECTRIC AUTOMATION
![over-current protection relay](https://img.directindustry.com/images_di/photo-m2/30064-15301193.jpg)
... 7SJ85 overcurrent protection has been designed specifically for protection of feeders and lines in medium-voltage and high-voltage systems. The SIPROTEC 7SJ86 overcurrent ...
Siemens Energy automation and smart grid
![over-current protection relay](https://img.directindustry.com/images_di/photo-m2/68287-11252053.jpg)
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 ...
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/88827-17951241.jpg)
COMBI-6 Type A & F MULTI-CHANNEL EARTH LEAKAGE RELAY The Multichannel earth leakage relays COMBI 6 have been designed for the monitoring and protection of up to 6 independent systems. ...
FRER
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/88827-16339054.jpg)
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 ...
FRER
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/88827-16339060.jpg)
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 ...
FRER
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/11644-2471415.jpg)
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 ...
CIRCUTOR
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/11644-17031471.jpg)
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 ...
CIRCUTOR
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/11644-6588685.jpg)
Tripping current: 0.03 A - 30 A
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 ...
CIRCUTOR
![current protection relay](https://img.directindustry.com/images_di/photo-m2/37684-18477960.jpg)
Tripping current: 15 A
... 3CR series current type motor starting relay is designed for single-phase AC applications with motor start winding currents up to 15 Amps. It is applicable on both split phase and capacitor start motors. The 3CR relay ...
![current protection relay](https://img.directindustry.com/images_di/photo-m2/37684-18477962.jpg)
Tripping current: 25 A
KLIXON® 4CR current type motor starting relay is a compact, high capacity relay, designed for universal application to split phase and capacitor start, single-phase motors with start-winding currents ...
![feeder protection relay](https://img.directindustry.com/images_di/photo-m2/20885-18551226.jpg)
Tripping current: 1 A - 5 A
Trigger voltage: 24 V - 230 V
SIR-A Overhead Control / RTU & Feeder Protection The Fanox SIR-A is the Relay that offers the complete solution for Recloser Control and Feeder Protection with current, voltage, ...
FANOX ELECTRONIC
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/20885-2977523.jpg)
Trigger voltage: 120, 230 V
... 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 ...
FANOX ELECTRONIC
![phase loss protection relay](https://img.directindustry.com/images_di/photo-m2/20885-15392614.jpg)
Trigger voltage: 230, 24 V
... and in general to protect motors which need dependable and accurate protection relays for every type of start. For 3-phase motors from 1 to 630 A and over. Cable feed through relay. Precise ...
FANOX ELECTRONIC
![thermal protection relay](https://img.directindustry.com/images_di/photo-m2/13616-19109972.jpg)
Trigger voltage: 80 V - 230 V
The contact protection relay BA 7961 protects sensitive control contacts of e.g. digital plc outputs, limit contacts on measuring devices, low load reed contacts against early wearing. It has a low input ...
![voltage protection relay](https://img.directindustry.com/images_di/photo-m2/183658-18650647.jpg)
RIS2 PROTECTION RELAY FOR DISTRIBUTION OIL TRANSFORMERS The RIS2 protection relay is a safety detector for distribution transformers. It's an essential ...
![thermal protection relay](https://img.directindustry.com/images_di/photo-m2/183658-18489950.jpg)
T-119 protective relay for monitoring the windings of your electrical transformer Temperature relay with T-119 The T119 is a unit developed to monitor the temperature of MV cast ...
![safety protection relay](https://img.directindustry.com/images_di/photo-m2/7337-18003004.jpg)
Tripping current: 20 mA
Trigger voltage: 24 V
... start with automatic start or a start button • Monitoring of downstream relays or contactors. • Simultaneity monitoring to monitor safety components over time • Relay start using a ...
![safety protection relay](https://img.directindustry.com/images_di/photo-m2/7337-18003070.jpg)
Tripping current: 0 A - 0.4 A
Trigger voltage: 24 V
... • 4 test outputs for monitoring for short circuits and overload states • 2 monitoring outputs programmed via the EUCHNER Safety Designer software • Scope of delivery • The expansion plug (order no. 121308) is ...
![over-voltage protection relay](https://img.directindustry.com/images_di/photo-m2/85325-18459066.jpg)
Tripping current: 5 A
Trigger voltage: 310 V - 520 V
Three phase voltage Protection relay Monitors: Over / Under voltage, Phase failure and Phase sequence Supply Voltage: 310 to 520V AC (L - L) 1 C/O DPDT output relay ...
SELEC Controls Pvt. Ltd.
![safety protection relay](https://img.directindustry.com/images_di/photo-m2/16061-18462777.jpg)
Tripping current: 2 A
Trigger voltage: 19 V - 29 V
The safety relay / safety switching devices from di-soric make simple integration of individual safety sensors into occupational safety solutions possible. ...
di-soric
![grid and system protection relay](https://img.directindustry.com/images_di/photo-m2/16071-16849078.jpg)
Trigger voltage: 24, 110 V
Grid protection monitoring relay RE series; Frequency and voltage monitoring; Grid and system protection; Functionally Safe; Measuring voltage 3 x 400/230V AC; Supply voltage 24V DC, ...
![grid and system protection relay](https://img.directindustry.com/images_di/photo-m2/16071-18348569.jpg)
Trigger voltage: 24 V - 110 V
... system protection monitoring relay RE series; Frequency and voltage monitoring; Functional safety; Measuring voltage 3 x 400/230V AC; Supply voltage 24V DC, 110-240V AC; 3 CO contacts; Width 107 mm; Installation ...
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/82417-19512216.jpg)
Tripping current: 0.03 A - 30 A
Trigger voltage: 48 V - 400 V
... Din modules Dossena presents the DER4B range, the new generation of type B differential toroid relays. DER4B is recommended for electrical protection in the tertiary sector, where devices that generate ...
DOSSENA
![current protection relay](https://img.directindustry.com/images_di/photo-m2/82417-19512280.jpg)
Tripping current: 0.03 A - 30 A
Trigger voltage: 48 V - 400 V
... Recessed 96x96mm Dossena presents the DER3B range, the new generation of type B differential toroid relays. DER3B is recommended for electrical protection in the tertiary sector, where devices that ...
DOSSENA
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/82417-19513566.jpg)
Tripping current: 0.03 A - 30 A
Trigger voltage: 48 V - 400 V
The residual current relays of the DER4 Dossena range can be used on LV networks in alternating current of the TT and TN type. They make it possible to achieve adequate selectivity and residual current protection ...
DOSSENA
![overload relay](https://img.directindustry.com/images_di/photo-m2/55636-19570620.jpg)
Tripping current: 14 A - 35 A
... important to prevent the motor from overheating, or thermal overload. IMO Thermal Overload Relays offer electromechanical protection for main circuits and reliable protection for motors ...
IMO Precision Controls Limited
![overload relay](https://img.directindustry.com/images_di/photo-m2/55636-19570674.jpg)
Tripping current: 20 A - 48 A
... important to prevent the motor from overheating, or thermal overload. IMO Thermal Overload Relays offer electromechanical protection for main circuits and reliable protection for motors ...
IMO Precision Controls Limited
![overload relay](https://img.directindustry.com/images_di/photo-m2/55636-18635167.jpg)
Tripping current: 0.12 A - 0.18 A
... important to prevent the motor from overheating, or thermal overload. IMO Thermal Overload Relays offer electromechanical protection for main circuits and reliable protection for motors ...
IMO Precision Controls Limited
![safety protection relay](https://img.directindustry.com/images_di/photo-m2/190484-13826933.jpg)
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 ...
GM International srl
![temperature protection relay](https://img.directindustry.com/images_di/photo-m2/4570258-18710714.jpg)
Tripping current: 6 A
... for power supply and output relay The TCM is used with PTC sensors (DIN 44081) to provide permanent over temperature protection for motors and other equipment Up to 6 PTC's connected in series can ...
HIQUEL
![safety protection relay](https://img.directindustry.com/images_di/photo-m2/209945-18701417.jpg)
... General Purpose Relay in strict accordance with the production process. GEYA has a detailed archive to ensure no error in General Purpose Relays’ development, production, acceptance, and sales. For ...
Zhejiang Geya Electrical Co., Ltd
![power protection relay](https://img.directindustry.com/images_di/photo-m2/238463-18497602.jpg)
Tripping current: 16 A
Trigger voltage: 250 V
... switches. While "normal" relays are monostable, i.e. they return to the idle state when the excitation is switched off, remanence relays are bistable, i.e. the current switching state is retained irrespective ...
Releco
![power protection relay](https://img.directindustry.com/images_di/photo-m2/26690-16719215.jpg)
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 ...
Contrel elettronica
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/26690-13053614.jpg)
Trigger voltage: 12 V - 415 V
... Adjustable tripping and delay time. Earth leakage relay with 1 operation threshold, flush mount. External CT. Introduction Range ELR Product name ELR-1E Product type Residual current protection ...
Contrel elettronica
![earth-leakage protection relay](https://img.directindustry.com/images_di/photo-m2/26690-16727457.jpg)
Trigger voltage: 24, 48, 110, 240, 415 V
... indicator (TRIP). Fail safe. Earth leakage relay with 2 operation thresholds, flush mount. External CT. Fail safe. Introduction Range ELR Product name ELR-2 Product type Residual current protection ...
Contrel elettronica
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![protection-relay](https://img.directindustry.com/images_di/kwref/kwref-m2/1/2/75121.jpg)
A protection relay shuts off a machine operating in a way that represents a potential risk to itself.
ApplicationsThese 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.
TechnologiesAs 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 chooseChoice of a protection relay depends on the monitored parameters: overcurrent, zero velocity, excessive speed, current consumption, leaks, etc.
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