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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 ...

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 ...

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 ...

overload relay / adjustable / electronic / motor
overload relay
TI 630 E

Tripping current: 160 A - 630 A

TI 630 E, Electronic motor protection relaysThe electronic motor protection relay covers the range from 160-630 Amp and protects squirrel cage motors of up to 238 kW against overload. ...

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: 10, 6 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 ...

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 ...

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 ...

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. ...

voltage protection relay / high-voltage / panel-mount
voltage protection relay

Eaton delivers sophisticated power protection for low- and medium voltage applications. Protective Relays provide you with unique microprocessor-based devices that eliminate unnecessary ...

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.

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
arc flash protection relay / current / phase / 1 NO/NC
arc flash protection relay
PGR-8800 series

... -8800 arc-flash relay is UL and cUL listed. It provides dependable detection of developing arc-flash incidents and avoids nuisance tripping. It achieves this by spotting a combination of extra light and current. For arc-flash ...

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Littelfuse
earth-leakage protection relay / insulation / 1 NO/NC / for motors
earth-leakage protection relay
PGR-6100 series

Tripping current: 0.01 A - 3 A

... 6100 Series features the Ground-Fault and Insulation Relay designed for general safety of motors. It is used for ground-fault protection and insulation monitoring. Integrated with predictive ...

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Littelfuse
voltage protection relay / panel-mount
voltage protection relay
1/3 x 19 in | 7SA84

All voltage levels are covered by the line protection system of this device, which comes with a 3-pole tripping system to ensure the best user experience and help you achieve the best results from your project. The overhead ...

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SIEMENS Energy Management
voltage protection relay / panel-mount
voltage protection relay
1/3 x 19 - 2/1 x 19 in | 7SA86

... - Distance Protection is a wonder of modern technology. It's key features are Line protection for all voltage levels with 3-pole tripping, Very short tripping time, Also used in switchgear with breaker-and-a-half ...

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SIEMENS Energy Management
voltage protection relay / panel-mount
voltage protection relay
1/3 x 19 - 2/1 x 19 in | 7SA87

... selective protection of overhead lines. It is suitable for radial, ring or any type of meshed systems of any voltage level. Grounded, compensated or isolated neutral points can be used in conjunction with this machine. ...

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SIEMENS Energy Management
phase protection relay / voltage / panel-mount / differential
phase protection relay
1/3 x 19 in | 7SD84

The 7SD84 - Differential Protection is a one of a kind product delivered by SIEMENS. It utilizes adaptive algorithm integrated with differential protection to achieve optimum stability and sensitivity. ...

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SIEMENS Energy Management
phase protection relay / voltage / panel-mount / differential
phase protection relay
1/3 x 19 - 2/1 x 19 in | 7SD86

... compensating coils in the protection zone. Suitable for radial, ring or any type of meshed systems of any voltage level with grounded, compensated or isolated neutral point. Protection of lines with capacities ...

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SIEMENS Energy Management
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
earth-leakage protection relay / panel-mount / DIN rail / digital
earth-leakage protection relay
X70DD

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
X48DS

The X48DS 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
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
earth-leakage protection relay / current / digital / DIN rail
earth-leakage protection relay
RGU-10 series

Electronic earth leakage protection relay, used to connect to the earth leakage transformers WG / WGC Series Superimmunized Type A relay with high frequency current filtering and high ...

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CIRCUTOR
earth-leakage protection relay / frequency / programmable / digital
earth-leakage protection relay
WRU10 series

... differential protection settings. protection trigger current. protection status messages, etc. Units with three programmable output contact relays, one switched and ...

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CIRCUTOR
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 ...

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: 1,000, 5 mA

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 / programmable / three-phase / configurable
over-current protection relay
SEL-351S

Protection System The SEL-351S Protection System offers comprehensive feeder and overcurrent protection perfect for industrial and utility feeder applications. Enhance ...

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Schweitzer Engineering Laboratories
over-voltage protection relay / over-current / digital / panel-mount
over-voltage protection relay
SEL-351

The SEL-351 Protection System has built-in Ethernet and IEEE C37.118 synchrophasors, and is ideal for directional overcurrent applications. Optional Mirrored Bits® communications and power quality ...

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Schweitzer Engineering Laboratories
earth-leakage protection relay / differential / time delay / adjustable
earth-leakage protection relay
RESYS M40

Tripping current: 0.03 A - 30 A

The Resys M40 is a type A differential relay manufactured by Socomec. Integrated with a remote trip breaking device, it provides an indirect contact protection and a leakage current limitation. Designed ...

earth-leakage protection relay / differential / DIN rail
earth-leakage protection relay
RESYS M40R

Tripping current: 0.03 A - 30 A

RESYS M40R are earth leakage relays that are often associated with a remote trip breaking device, offering automatic power breaking and reclosing. In terms of the functionality, the leakage current limitations and protection ...

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-voltage protection relay / panel-mount / digital / programmable
over-voltage protection relay
SIA-F

Protection functions: 50P, 50/51P, 50N/G, 50/51 N/G, CLP and 86. Optionally 52, 50BF, 49, 49T and Trip block for Switch disconnector. Auxiliary supply (110-230 Vac / 90-300 Vdc or 24-48 Vdc). Compact size ...

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FANOX ELECTRONIC
over-voltage protection relay / panel-mount / digital / programmable
over-voltage protection relay
SIL-A

Many Protection functions by default: 50P(2), 50N/G(2)(*), 50/51P, 50/51 N/G(*), 50BF, 46, 52, 79, 74TCS, COLD LOAD PICK-UP, 86, 49T . Optionally 49, 74CT, 37, 46BC, Trip Block for switch disconnector. SIL-A ...

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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 ...

phase protection relay / overload / current / level
phase protection relay
TPM6

Tripping current: 0 A - 40 A

Control and protection module for motors and pumps. - Protections: overload, underload, phase and level failure. - 0…40A 230/400VAC - Level relay and pressure switch connections Codes ...

phase loss protection relay / overload / with fault indication / digital
phase loss protection relay
TPM5

Tripping current: 5 A

Protection relay against overload, underload, and phase loss. With display. Codes and references - 10002217 TPM5-230 - 10002218 TPM5-400 - 10002451 TPM5/5-230 - 10002452 TPM5/5-400 Specifications - ...

phase loss protection relay / overload / over-current / under-current
phase loss protection relay
TPM-Drain

Tripping current: 0.6 A - 40 A

Control module for ECO-Drain Control and protection module for pumps and motors with overload, underload, phase failure and level, 0…40A 230/400VAC, control through float switches. Power supply: 230/400Vac – 50/60Hz Consumption: ...

overload relay / digital / programmable / configurable
overload relay
TPM-Pool

Tripping current: 0.5 A - 20 A

... thermal protection with automatic setting of motor overload and underload. External On/Off control of spotlights and scene change function (RGB). External On/Off control of the pump. Forced pump Start/Stop in manual mode. Integrated ...

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
1 NO/NC protection relay
1 NO/NC protection relay
ELR-D2-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 / 2 NO/NC / modular / DIN rail
earth-leakage protection relay
ELR-3C

... transmissions offer lifelong regulation of the Toroidal - ELR orbit. Any disturbance to this orbit can facilitate instant trip of security and enables you to recognize the anomaly without having a timely regulation done ...

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Contrel elettronica
level protection relay / DIN rail
level protection relay
MP

Tripping current: 0.63 A - 1 A

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 ...

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.

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
overload relay / DIN rail / three-phase / automatic reset
overload relay
TRM-400

Tripping current: 290 A - 400 A

Digital Overload Relays are designed to protect the devices having precise operating current values against the errors likely to arise from excessive current. Descriptions: There are High (Overload Relay ...

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Tense
overload relay / DIN rail / three-phase / automatic reset
overload relay
TRM-10

Tripping current: 0.1 A - 10 A

Digital Overload Relays are designed to protect the devices having precise operating current values against the errors likely to arise from excessive current. Descriptions: There are High (Overload Relay ...

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Tense

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.