merXu
Cancel
categories
Phase monitoring relays
Parameters
EUR
EUR
94
0
0
0
7
0
1
21
7
9
31

Phase monitoring relays

(94 results)
Sort by
Relay for phase loss and asymmetry F & f 10A 1Z 4sec 45V CZF

Relay for phase loss and asymmetry F & f 10A 1Z 4sec 45V CZF

ASAJ Sp. z o.o.
Starting at
€9.18 +VAT
PLN 43.25
  • EAN: 5908312593010
  • Manufacturer: F&F
Supplier
ASAJ Sp. z o.o.
leave message
Phase sequence and phase loss relay F&F CKF-B 10A 1Z delay 4s asymmetry 55V for DIN rail

Phase sequence and phase loss relay F&F CKF-B 10A 1Z delay 4s asymmetry 55V for DIN rail

ASAJ Sp. z o.o.
Starting at
€11.20 +VAT
PLN 52.79
  • EAN: 5908312593058
  • Manufacturer: F&F
Supplier
ASAJ Sp. z o.o.
leave message
F & f sequence relay for phase loss and phase unbalance 10A 1P 4sec 40-80V CKF-317

F & f sequence relay for phase loss and phase unbalance 10A 1P 4sec 40-80V CKF-317

ASAJ Sp. z o.o.
Starting at
€12.69 +VAT
PLN 59.78
  • EAN: 5908312593171
  • Manufacturer: F&F
Supplier
ASAJ Sp. z o.o.
leave message
Phase failure relay F&F CZF2-B 10A 1Z with contact control delay 4s asymmetry 55V for DIN rail

Phase failure relay F&F CZF2-B 10A 1Z with contact control delay 4s asymmetry 55V for DIN rail

ASAJ Sp. z o.o.
Starting at
€14.11 +VAT
PLN 66.47
  • EAN: 5908312593065
  • Manufacturer: F&F
Supplier
ASAJ Sp. z o.o.
leave message
F&F Phase imbalance and sequence relay 10A 1P 4sec 40-80V CKF-317

F&F Phase imbalance and sequence relay 10A 1P 4sec 40-80V CKF-317

Morele.net
€15.01 +VAT
PLN 70.72
  • Manufacturer: F&F
Supplier
Morele.net
leave message
Eaton phase unbalance control relay 1P 0.5sec 380-415V AC EMR6-A500-D-1 (184762)

Eaton phase unbalance control relay 1P 0.5sec 380-415V AC EMR6-A500-D-1 (184762)

Morele.net
€85.62 +VAT
PLN 403.44
  • Manufacturer: Eaton
Supplier
Morele.net
leave message
F&F Relay for phase decay and unbalance 10A 1NO 4sec 45V CKF

F&F Relay for phase decay and unbalance 10A 1NO 4sec 45V CKF

Morele.net
€11.21 +VAT
PLN 52.84
  • Manufacturer: F&F
Supplier
Morele.net
leave message
Carlo Gavazzi Solid state relay, single phase 25A 230V AC 4.5-32V DC (RS1A23D25)

Carlo Gavazzi Solid state relay, single phase 25A 230V AC 4.5-32V DC (RS1A23D25)

Morele.net
€20.70 +VAT
PLN 97.54
  • Manufacturer: Carlo Gavazzi
Supplier
Morele.net
leave message
Relpol Three phase solid state relay 40A AC 4-32V DC RZ3A40D40

Relpol Three phase solid state relay 40A AC 4-32V DC RZ3A40D40

Morele.net
€100.94 +VAT
PLN 475.60
  • Manufacturer: Relpol
Supplier
Morele.net
leave message
Novatek-Electro Phase sequence, loss and unbalance relay 2P 400V (RNPP-311.1)

Novatek-Electro Phase sequence, loss and unbalance relay 2P 400V (RNPP-311.1)

Morele.net
€27.60 +VAT
PLN 130.07
  • Manufacturer: Novatek-Electro
Supplier
Morele.net
leave message
Hager Polo Phase and asymmetry control relay 400V AC 3-phase (EU300)

Hager Polo Phase and asymmetry control relay 400V AC 3-phase (EU300)

Morele.net
€66.90 +VAT
PLN 315.24
  • Manufacturer: Hager Polo
Supplier
Morele.net
leave message
Eaton phase control relay EMR6-AWN-280-D-1 (184770)

Eaton phase control relay EMR6-AWN-280-D-1 (184770)

Morele.net
€108.49 +VAT
PLN 511.19
  • Manufacturer: Eaton
Supplier
Morele.net
leave message
F&F Phase failure and unbalance relay with contact control 10A 1P 4sec 40-80V CZF-332

F&F Phase failure and unbalance relay with contact control 10A 1P 4sec 40-80V CZF-332

Morele.net
€17.94 +VAT
PLN 84.54
  • Manufacturer: F&F
Supplier
Morele.net
leave message
Relpol Single-phase solid state relay 50A 230V 4.5-32V DC RM1A23D50

Relpol Single-phase solid state relay 50A 230V 4.5-32V DC RM1A23D50

Morele.net
€25.60 +VAT
PLN 120.61
  • Manufacturer: Relpol
Supplier
Morele.net
leave message
F&F Relay for phase loss and asymmetry 10A 1NO 4sec 45V CZF

F&F Relay for phase loss and asymmetry 10A 1NO 4sec 45V CZF

Morele.net
€10.87 +VAT
PLN 51.21
  • Manufacturer: F&F
Supplier
Morele.net
leave message
F&F Voltage monitoring relay 3-phase 3x (50-450V) + N 3R 8A 170-210V AC CP-733

F&F Voltage monitoring relay 3-phase 3x (50-450V) + N 3R 8A 170-210V AC CP-733

Morele.net
€28.85 +VAT
PLN 135.96
  • Manufacturer: F&F
Supplier
Morele.net
leave message
Eaton Phase power supply control relay 2P 350-580V EMR5-AWM580-2 134235

Eaton Phase power supply control relay 2P 350-580V EMR5-AWM580-2 134235

Morele.net
€46.72 +VAT
PLN 220.15
  • Manufacturer: Eaton
Supplier
Morele.net
leave message
Carlo Gavazzi Three Phase Solid State Relay 24-440V AC 55A 4-32V DC (RZ3A40A55)

Carlo Gavazzi Three Phase Solid State Relay 24-440V AC 55A 4-32V DC (RZ3A40A55)

Morele.net
€144.96 +VAT
PLN 683.05
  • Manufacturer: Carlo Gavazzi
Supplier
Morele.net
leave message
Novatek-Electro Voltage monitoring relay 1-phase 230V AC (RN-113)

Novatek-Electro Voltage monitoring relay 1-phase 230V AC (RN-113)

Morele.net
€35.54 +VAT
PLN 167.47
  • Manufacturer: Novatek-Electro
Supplier
Morele.net
leave message
Relpol Single-phase solid state relay 25A 230V 4.5-32V DC RM1A23D25

Relpol Single-phase solid state relay 25A 230V 4.5-32V DC RM1A23D25

Morele.net
€23.59 +VAT
PLN 111.16
  • Manufacturer: Relpol
Supplier
Morele.net
leave message
Didn't find what you were looking for? We will help you!

Phase monitoring relays

Phase monitoring relays belong to the monitoring relays that are used in automation and control systems to control phase voltages in three-phase AC networks. Their role is to protect electric motors supplied from a three-phase network against voltage failure in at least one phase. They also prevent voltage asymmetry between phases. They also protect against damage to the operating contactor and change of the phase connection sequence, which may result in incorrect operation or damage to the motor.

Phase control relays are useful in three-phase networks, and their installation in the system is of great importance in the event of a power failure in one of the phases, or in the event of voltage unbalance. They detect cases where there is incorrect sequence of the power phases, which prevents the motor from rotating in the wrong direction.

Phase monitoring relays can be used to protect single motors or a group of motors. In such cases, they are powered by a common contactor or a magnetically latched switch. They are used for any three-phase motors, maintenance-free devices, e.g. fans, air conditioners, welders, pumps, cooling devices, computers. F&F relays perform very well in this role.

These types of relays are also used to protect equipment in a small installation from one external source. The phase control relay has an auto-reset capability to protect the motors without the compulsion of sensory control. In the event of a phase failure, the motor will be disconnected, and when the specified conditions are restored, the relay is reset.

Tasks of phase control relays

The sequence and phase failure relay detects accidents that could eventually damage the engine. The main tasks of phase control relays, in addition to detecting incorrect phase sequence and preventing the motor from starting in the wrong direction, also include immediate motor shutdown in the event of a change in the phase sequence in the supply voltage. The relay detects a phase failure and switches the output contact instantaneously. It detects the unbalance of the supply voltage (exceeding 40%) and, similarly to a phase failure, switches the output contact. The role of the relay also boils down to switching off the device when the supply voltage drops symmetrically below 0.8Un.

How phase control relays work

A loss of voltage in at least one phase, or voltage unbalance between phases above the threshold, will result in the motor being shut down. Usually, it is delayed (depending on the manufacturer, from one to several seconds), which allows to protect the device against accidental disconnection in the event of a temporary voltage drop. It is switched on again automatically when the voltage rises by 5V above the activation voltage. It is the value of the voltage hysteresis. The phase monitoring relay detects voltage failure. In normal operation, the three-phase voltage input phases present in the standard network are balanced.

When any phase is unbalanced by more than 12% with respect to the other two (high or low), phase failure occurs, the sensor network supplies an output voltage to activate the transistor circuit. As a consequence, the main output relay (phase-noise relay) trips. Most of the phase control relays have an adjustable switch-off and recovery delay and a different voltage unbalance threshold.

How to mount the relays

Most types of relays allow for easy surface mounting and mounting on a TH 35mm rail. They do not require a neutral conductor, and surface-mounted versions are available with a wire connection and / or connectors. Installation and commissioning is relatively easy as it does not require additional measurements and settings. It can be mounted in any position.