Protection relays

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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 ...

level protection relay
level 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
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 ...

electric motor protection relay
electric motor protection relay
RW_E series

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
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
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
TH-T series

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.

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MITSUBISHI ELECTRIC 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
over-current protection relay
over-current protection relay
P50 Agile P154

... substations and as a backup relay in HV systems. P154 can also be applied for direct refurbishment of substations using older generations of non-communicating overcurrent relays. The ...

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Alstom Grid
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 ...

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 ...

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 ...

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 ...

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
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
phase loss protection relay
phase loss protection relay
C Series

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 ...

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FANOX ELECTRONIC
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
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-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 ...

voltage protection relay
voltage protection relay
46212 series

Tripping current: 3 A - 4 A
Trigger voltage: 30 V - 250 V

... Very compact design 1 relay safety output potential-​free SIL3/PLe/Kat.4 1 control output changeover contact potential-​free LEDs for status and error indication The compact design ...

insulation protection relay
insulation protection relay
DCG-UBC1

Tripping current: 30 mA
Trigger voltage: 400 V

... communication method:RS485 Protocol,Standard MODBUS protocol Internal ground impedance:1024k (ohm) Relay output form:Normally open + normally closed Relay output contact:3A, 250VAC/30VDC Response ...

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Chongqing Blue Jay Technology Co. Ltd
insulation protection relay
insulation protection relay
DCG-UBCH2

Tripping current: 30 mA
Trigger voltage: 250 V

GYDCG-UBCH2 series products are used for on-line monitoring dc floating land system is thecathode of insulation resistance of thedevice, it is based on the principle of unbalanced bridge, toavoid the balance bridge across the electrodes ...

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Chongqing Blue Jay Technology Co. Ltd
current protection relay
current protection relay
GYID Series

GYID series insulation monitor is used for real-time monitoring of the insulation resistance between the high voltage components (0~1000Vdc) and the chassis (earth) of the power battery pack (pure electric or hybrid) power supply system. ...

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Chongqing Blue Jay Technology Co. Ltd
differential protection relay
differential protection relay
DER3BDUAL/2I

Tripping current: 0.05 A - 16 A
Trigger voltage: 48 V - 400 V

... 96x96mm Dossena presents the DER3B DUAL range, the new generation of type B differential toroid relays. DER3B DUAL is recommended for electrical protection in the tertiary sector, where devices ...

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DOSSENA
differential protection relay
differential protection relay
DER3BDUAL/6D

Tripping current: 0.05 A - 16 A
Trigger voltage: 48 V - 400 V

... modules Dossena presents the DER3B DUAL range, the new generation of type B differential toroid relays. DER3B DUAL is recommended for electrical protection in the tertiary sector, where devices ...

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DOSSENA
earth-leakage protection relay
earth-leakage protection relay
DER3/0D

Tripping current: 0.03 A - 30 A
Trigger voltage: 48 V - 400 V

The residual current relays of the DER3 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
temperature protection relay
temperature protection relay
TCM series

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 ...

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HIQUEL
safety protection relay
safety protection relay
JQX-13F LY4

... 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 ...

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Zhejiang Geya Electrical Co., Ltd
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
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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.