Protection relays

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Protection relays | Choosing the Right Protection Relay
Protection relays enable the safe distribution of electricity from the grid. Their function is to detect anomalies in the grid that could lead to dangerous situations and, if necessary, interrupt the electrical circuit for as long as necessary. They provide differential, overcurrent, and arc flash protection. This protection is ensured by the relay’s ability to respond rapidly. A relay can consist of several modules, each with its own function.
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thermal protection relay
thermal protection relay
ZEB series

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 ...

arc flash protection relay
arc flash protection relay
AF0100 series

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 ...

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Littelfuse
arc flash protection relay
arc flash protection relay
AF0500 series

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 ...

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Littelfuse
phase protection relay
phase protection relay
PGR-8800 series

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 ...

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Littelfuse
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

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 ...

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CIRCUTOR
over-voltage protection relay
over-voltage protection relay
800VPR-3

Tripping current: 5 A
Trigger voltage: 310 V - 520 V

• Three phase voltage Protection relay • Monitors: Over / Under voltage, Phase failure and Phase sequence • 1 C/O DPDT output relay • Auto reset feature available Brief Specifications Measuring ...

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SELEC Controls Pvt. Ltd.
safety protection relay
safety protection relay
SR-0

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. ...

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di-soric
thermal protection relay
thermal protection relay
BA 7961

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 ...

safety protection relay
safety protection relay
ESM-BA201

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
safety protection relay
MSC-CE-AC-FI8FO2-121290

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 ...

earth-leakage protection relay
earth-leakage protection relay
X52UL6

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. ...

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FRER
earth-leakage protection relay
earth-leakage 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
earth-leakage protection relay
earth-leakage 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
self-powered protection relay
self-powered protection relay
SIA-C

OC&EF Protection Relay (self-powered + auxiliary power supply). - Self-powered with operating current through 3 standard current transformers /5 or /1, to obtain current measurements. Universal 24-230 ...

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FANOX ELECTRONIC
feeder protection relay
feeder protection relay
SIR-A

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, ...

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FANOX ELECTRONIC
earth-leakage protection relay
earth-leakage protection relay
DM30

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 ...

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FANOX ELECTRONIC
current protection relay
current protection relay
3CR series

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
current protection relay
4CR series

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 ...

grid and system protection relay
grid and system protection relay
NA003-M64

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
grid and system protection relay
NA003.COM-64

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
earth-leakage protection relay
DER4B/2D

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 ...

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DOSSENA
earth-leakage protection relay
earth-leakage protection relay
DER4B/2I

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 ...

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DOSSENA
earth-leakage protection relay
earth-leakage protection relay
DER4/0D

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 ...

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DOSSENA
overload relay
overload relay
MCOR-2-20

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 ...

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IMO Precision Controls Limited
overload relay
overload relay
MCOR-3-28

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 ...

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IMO Precision Controls Limited
overload relay
overload relay
MCOR-1-0.18

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 ...

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IMO Precision Controls Limited
power protection relay
power protection relay
CHI14

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 ...

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Releco
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
earth-leakage protection relay
earth-leakage protection relay
ELR-1E

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 ...

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Contrel elettronica
earth-leakage protection relay
earth-leakage protection relay
ELR-2

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 ...

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Contrel elettronica
voltage protection relay
voltage protection relay
230 V, max. 10 A | IMREF2SS series

Tripping current: 0 A - 10 A
Trigger voltage: 230 V

... Easy to replace pluggable relays. -Possibility of Bussing (Jumpering) relays in common negative or common positive configurations. -Relay Coil Protection by means of ...

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Connectwell Industries
three-phase protection relay
three-phase protection relay
LXPRC/S

Trigger voltage: 110, 208, 380, 400, 415 V

... phase loss - Adjustable Trip levels and Time delay - SPDT Relay output - 17.5mm wide, DIN Rail mount - UL Listed The product monitors it’s own three-phase supply and for the output relay to energise, ...

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Broyce Control
voltage protection relay
voltage protection relay
MEprotect

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 ...

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MITSUBISHI Automation
thermal protection relay
thermal protection relay
TH series

Tripping current: 0.1 A - 400 A
Trigger voltage: 200 V - 440 V

Protects motors against overload and locked rotor, securing safe operation. Standard model complies with Japanese and many international standards.

arc flash protection relay
arc flash protection relay
REA 105

The REA 105 module detects light and carries out tripping if the main REA 101 module simultaneously provides an overcurrent signal. REA 105 modules are typically used for main-tie-main configured switchgears or as selective ...

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ABB Oy Distribution Automation
over-current protection relay
over-current protection relay
SIPROTEC 7SJ series

... 7SJ85 overcurrent protection has been designed specifically for protection of feeders and lines in medium-voltage and high-voltage systems. The SIPROTEC 7SJ86 overcurrent ...

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SIEMENS Energy automation and smart grid
electric motor protection relay
electric motor protection relay
RW_E series

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

... mounting on the contactors or on an individual base, the RW_E electronic overload relays provide protection for electric motors up to 840 A. •Incorporated protections: overload, phase ...

generator protection relay
generator protection relay
Multilin 889

The Multilin 889 relay, a member of the Multilin 8 Series protective relay platform, has been designed for the protection, control, monitoring and management generators ...

overload relay
overload relay
GSR1-09

Tripping current: 0.1 A - 0.16 A
Trigger voltage: 690 V

GSR1 series thermal overload relay is used in AC 50Hz (or 60Hz); rated voltage is up to 690V, for protecting AC motor against overload or phase-breaking.

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Tianshui 213 Electrical Apparatus Group CO.,LTD.
electric motor protection relay
electric motor protection relay
C440 series

Tripping current: 0.3 A - 1,500 A
Trigger voltage: 690 V

Increased flexibility, enhanced protection The C440/XTOE electronic overload relay delivers enhanced motor protection and communications capabilities in a single compact device, directly ...

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Eaton Count Control Products
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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.