Current monitoring device

If you would like to be in control of your electrical installation, then monitor your cables and wires for correct function and proper current flow. Especially if you want to minimize downtime or failures within production processes, you can counteract any problems early and effectively with a current monitoring relay. Learn more about the types and uses of power monitoring devices here. Use our help when making a purchase decision and choose from numerous quality products at top conditions here in your eibabo® shop.

Analysis and Evidence

High-quality current monitoring devices are able to store errors that occur for later evaluation, to communicate with other components and, if necessary, to send out alarm signals.


Devices of this type are typically installed in the control cabinet and use suitable relays to protect your system against undervoltage or overvoltage or against undercurrent or overcurrent.

What types of surveillance devices are there?

A monitoring device is a protective relay that is used to monitor various states of an electrical system. It is therefore an electrical switch which is triggered when certain specified parameters are exceeded. The device provides protection by shutting down the system in the event of an abnormal condition. A monitoring device (also called a control relay) typically consists of two main components: a sensing circuit for detecting condition and a trigger element. The detection element is used to determine the monitored parameters. The triggering element serves to trigger the switching process.

Individual settings can often be made by the user with these devices. The protection parameters can thus be adapted to the requirements of the respective system. This is done using adjustment wheels and screws or, in the case of digital relays, using buttons and a display. Among other things, the following can be set:

  • Delay – to avoid false alarms due to sudden power surges
  • Reset (manual or automatic) - used to reset the electrical system after a shift
  • Remote Reset - to remotely reset the electrical system after a shift
  • Alarm – to trigger an alarm in the event of a trip

 

Surveillance devices fall into different categories. These are based on the parameter being monitored. This can be voltage and current, but also filling levels or temperatures. The most common monitoring devices are:

  • Voltage monitors - trip when the voltage in an electrical system exceeds and/or falls below a specified level.
  • Phase monitors – are used to monitor and protect against polarity reversal, phase failure and phase asymmetry. These constantly check the phase difference between two or more phases.
  • Current monitors - protect equipment in an electrical system from overcurrent or undercurrent. Current monitoring relays trigger when the current exceeds or falls below a predetermined value.
  • Frequency Monitors - Used primarily in Alternating Current (AC) systems where line frequency control is required. These relays are therefore used to protect against frequency anomalies.
  • Temperature monitors – primarily protect against overheating by constantly monitoring the temperature of the system and the devices that are being protected. Areas of application are predominantly industrial plants where extreme temperatures are a problem.
  • Level monitors - are switches for level control in cisterns, tanks and other storage containers. These devices are used wherever liquid levels need to be monitored.

 

Source: eibabo®, Pilz S1IM #828050 current monitoring relayImage: Pilz S1IM #828050 current monitoring relay

The different types of current monitors

Current monitors are important devices when it comes to protecting electrical systems. These help prevent damage to equipment and components by shutting off a circuit in the event of a fault. There are different types of electricity monitors. Each has its own advantages and areas of application. Depending on this, please select the right type to ensure proper protection.

Primary and secondary power monitors

Primary devices are mostly part of a circuit breaker and are mainly used in electrical networks with voltages up to 1000 volts. Secondary current monitors are connected to the circuit through a current transformer, which in turn is connected to the power supply. The current transformer reduces the current to a value suitable for the function of the monitoring device. Secondary current monitors are in turn divided into the following subspecies:

Electromagnetic Devices

The devices based on the principle of electromagnetism are the most common. These consist of a core with a copper winding and an armature with attached switch contacts. When the current is off, a spring keeps the armature away from the core. When a voltage is applied, a magnetic field builds up around the core. This attracts the armature and thus switches the connected contacts. The majority of electromagnetic devices are so-called polarized relays. These contain two cores with windings, a permanent magnet and a contact rod. Operation is dependent on the polarity of the input signal. There are electromagnetic relays for alternating and direct current. Their advantages lie in high-quality galvanic isolation, low price, low contact voltage drop and low heat development. No refrigeration is required. Devices of this type are resistant to impulse loads and interference from lightning strikes. The main disadvantages are the limited mechanical and electrical service life and the low operating speed.

induction relay

The principle of operation of induction relays is based on the interaction between the current induced in a conductor and a variable magnetic flux. Therefore, with alternating current, these are used as indirect protection relays. The integrated components of the device are arranged in such a way that they are aligned with each other at the set frequency of the current and are not deflected. When the frequency changes, a moving element moves, causing the contacts to close or open. We distinguish between induction devices with a frame, with a pane and with glass.

differential relay

Such devices compare the current strength before the consumer and after it. This consumer is usually a power transformer. In the normal state, both values are approximately the same. However, if a short circuit occurs, this balance is disturbed. As a result, the relay closes the contacts and turns off the faulty section of the circuit. Often found in household appliances and lamps, these relays protect people from electric shock.

Relays on microcircuits in the integrated electronics

The devices work with semiconductors such as triacs or thyristors. In the basic principle, such a device compares the incoming signal with the parameters stored in the device for trouble-free operation. If there is a deviation, the relay breaks the circuit.

thermal relay

Thermal relays work with an integrated bimetal. This heats up when an electric current is passed through it. If the current flow deviates from the specified value, the bimetallic strip deforms, causing the contacts to open and close.

What should you look for in a current monitoring device?

In order for the current monitor to work, its parameters must meet the requirements of the assigned tasks. When selecting a device, pay attention to the following features:

  • Voltage in volts - this is the voltage range in which the device normally operates
  • Current in amperes - each device is rated for a specific current
  • Tripping power in watts - this is the minimum power of the electrical current supplied for normal operation
  • Control power in watts - this is the maximum power of electric current at which the relay will perform its functions correctly

 

 


TIP

When making your selection, pay attention to the prevailing operating conditions. Is the device used in critical environments with high humidity, dirt, heat, cold or vibrations?


 

Furthermore, the error detection depends on the accuracy of the measurement of the current strength in amperes. The response time of the device is another important parameter. How long does the device take from the moment of the event to triggering? Under certain circumstances, it can be advantageous to be able to individually set a delay before switching the device on or off for critical loads.

As a specialist for smart home technology, we at the eibabo® online shop are your competent partner for all questions relating to intelligent electrical installation. You can get high-quality current monitoring devices from us from well-known manufacturers such as ABB, Dold, Eaton, Eltako, Hager, Pilz, Siemens and many others.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Relays > Current monitoring relay you will find items from the following product groups:

Item overview:

  • Current measurement
  • Current measuring relay
  • Dry run protection
  • Fuse clamps
  • Level measurement
  • Level monitoring
  • Level relay
  • Level switch
  • Load monitoring relay
  • Load relay
  • Load shedding relay
  • Modular installation device
  • Overcurrent monitor
  • Overcurrent monitoring
  • Overcurrent relay
  • Power guard
  • Power monitoring
  • Power monitoring device
  • Power monitoring relay
  • Power relay
  • Power window relay
  • Security module
  • Selectivity
  • Supplementary module
  • Test function
  • Three-phase monitoring device
  • Transfer blocks
  • Window current relay


from the following manufacturers:

Manufacturer overview catalogue Current monitoring device:

  • ABB
  • Bender
  • Dold
  • Eaton
  • Eberle
  • Eltako
  • ETA
  • Finder
  • Hager
  • Lütze
  • Metz
  • Murrelektronik
  • Phoenix
  • Pilz
  • Schalk
  • Schneider Electric
  • Siemens
  • WAGO


 
If you would like to be in control of your electrical installation, then monitor your cables and wires for correct function and proper current flow. Especially if you want to minimize downtime or... read more »
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Power Monitoring Devices - Types and Characteristics

If you would like to be in control of your electrical installation, then monitor your cables and wires for correct function and proper current flow. Especially if you want to minimize downtime or failures within production processes, you can counteract any problems early and effectively with a current monitoring relay. Learn more about the types and uses of power monitoring devices here. Use our help when making a purchase decision and choose from numerous quality products at top conditions here in your eibabo® shop.

Analysis and Evidence

High-quality current monitoring devices are able to store errors that occur for later evaluation, to communicate with other components and, if necessary, to send out alarm signals.


Devices of this type are typically installed in the control cabinet and use suitable relays to protect your system against undervoltage or overvoltage or against undercurrent or overcurrent.

What types of surveillance devices are there?

A monitoring device is a protective relay that is used to monitor various states of an electrical system. It is therefore an electrical switch which is triggered when certain specified parameters are exceeded. The device provides protection by shutting down the system in the event of an abnormal condition. A monitoring device (also called a control relay) typically consists of two main components: a sensing circuit for detecting condition and a trigger element. The detection element is used to determine the monitored parameters. The triggering element serves to trigger the switching process.

Individual settings can often be made by the user with these devices. The protection parameters can thus be adapted to the requirements of the respective system. This is done using adjustment wheels and screws or, in the case of digital relays, using buttons and a display. Among other things, the following can be set:

  • Delay – to avoid false alarms due to sudden power surges
  • Reset (manual or automatic) - used to reset the electrical system after a shift
  • Remote Reset - to remotely reset the electrical system after a shift
  • Alarm – to trigger an alarm in the event of a trip

 

Surveillance devices fall into different categories. These are based on the parameter being monitored. This can be voltage and current, but also filling levels or temperatures. The most common monitoring devices are:

  • Voltage monitors - trip when the voltage in an electrical system exceeds and/or falls below a specified level.
  • Phase monitors – are used to monitor and protect against polarity reversal, phase failure and phase asymmetry. These constantly check the phase difference between two or more phases.
  • Current monitors - protect equipment in an electrical system from overcurrent or undercurrent. Current monitoring relays trigger when the current exceeds or falls below a predetermined value.
  • Frequency Monitors - Used primarily in Alternating Current (AC) systems where line frequency control is required. These relays are therefore used to protect against frequency anomalies.
  • Temperature monitors – primarily protect against overheating by constantly monitoring the temperature of the system and the devices that are being protected. Areas of application are predominantly industrial plants where extreme temperatures are a problem.
  • Level monitors - are switches for level control in cisterns, tanks and other storage containers. These devices are used wherever liquid levels need to be monitored.

 

Source: eibabo®, Pilz S1IM #828050 current monitoring relayImage: Pilz S1IM #828050 current monitoring relay

The different types of current monitors

Current monitors are important devices when it comes to protecting electrical systems. These help prevent damage to equipment and components by shutting off a circuit in the event of a fault. There are different types of electricity monitors. Each has its own advantages and areas of application. Depending on this, please select the right type to ensure proper protection.

Primary and secondary power monitors

Primary devices are mostly part of a circuit breaker and are mainly used in electrical networks with voltages up to 1000 volts. Secondary current monitors are connected to the circuit through a current transformer, which in turn is connected to the power supply. The current transformer reduces the current to a value suitable for the function of the monitoring device. Secondary current monitors are in turn divided into the following subspecies:

Electromagnetic Devices

The devices based on the principle of electromagnetism are the most common. These consist of a core with a copper winding and an armature with attached switch contacts. When the current is off, a spring keeps the armature away from the core. When a voltage is applied, a magnetic field builds up around the core. This attracts the armature and thus switches the connected contacts. The majority of electromagnetic devices are so-called polarized relays. These contain two cores with windings, a permanent magnet and a contact rod. Operation is dependent on the polarity of the input signal. There are electromagnetic relays for alternating and direct current. Their advantages lie in high-quality galvanic isolation, low price, low contact voltage drop and low heat development. No refrigeration is required. Devices of this type are resistant to impulse loads and interference from lightning strikes. The main disadvantages are the limited mechanical and electrical service life and the low operating speed.

induction relay

The principle of operation of induction relays is based on the interaction between the current induced in a conductor and a variable magnetic flux. Therefore, with alternating current, these are used as indirect protection relays. The integrated components of the device are arranged in such a way that they are aligned with each other at the set frequency of the current and are not deflected. When the frequency changes, a moving element moves, causing the contacts to close or open. We distinguish between induction devices with a frame, with a pane and with glass.

differential relay

Such devices compare the current strength before the consumer and after it. This consumer is usually a power transformer. In the normal state, both values are approximately the same. However, if a short circuit occurs, this balance is disturbed. As a result, the relay closes the contacts and turns off the faulty section of the circuit. Often found in household appliances and lamps, these relays protect people from electric shock.

Relays on microcircuits in the integrated electronics

The devices work with semiconductors such as triacs or thyristors. In the basic principle, such a device compares the incoming signal with the parameters stored in the device for trouble-free operation. If there is a deviation, the relay breaks the circuit.

thermal relay

Thermal relays work with an integrated bimetal. This heats up when an electric current is passed through it. If the current flow deviates from the specified value, the bimetallic strip deforms, causing the contacts to open and close.

What should you look for in a current monitoring device?

In order for the current monitor to work, its parameters must meet the requirements of the assigned tasks. When selecting a device, pay attention to the following features:

  • Voltage in volts - this is the voltage range in which the device normally operates
  • Current in amperes - each device is rated for a specific current
  • Tripping power in watts - this is the minimum power of the electrical current supplied for normal operation
  • Control power in watts - this is the maximum power of electric current at which the relay will perform its functions correctly

 

 


TIP

When making your selection, pay attention to the prevailing operating conditions. Is the device used in critical environments with high humidity, dirt, heat, cold or vibrations?


 

Furthermore, the error detection depends on the accuracy of the measurement of the current strength in amperes. The response time of the device is another important parameter. How long does the device take from the moment of the event to triggering? Under certain circumstances, it can be advantageous to be able to individually set a delay before switching the device on or off for critical loads.

As a specialist for smart home technology, we at the eibabo® online shop are your competent partner for all questions relating to intelligent electrical installation. You can get high-quality current monitoring devices from us from well-known manufacturers such as ABB, Dold, Eaton, Eltako, Hager, Pilz, Siemens and many others.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue Relays > Current monitoring relay you will find items from the following product groups:

Item overview:

  • Current measurement
  • Current measuring relay
  • Dry run protection
  • Fuse clamps
  • Level measurement
  • Level monitoring
  • Level relay
  • Level switch
  • Load monitoring relay
  • Load relay
  • Load shedding relay
  • Modular installation device
  • Overcurrent monitor
  • Overcurrent monitoring
  • Overcurrent relay
  • Power guard
  • Power monitoring
  • Power monitoring device
  • Power monitoring relay
  • Power relay
  • Power window relay
  • Security module
  • Selectivity
  • Supplementary module
  • Test function
  • Three-phase monitoring device
  • Transfer blocks
  • Window current relay


from the following manufacturers:

Manufacturer overview catalogue Current monitoring device:

  • ABB
  • Bender
  • Dold
  • Eaton
  • Eberle
  • Eltako
  • ETA
  • Finder
  • Hager
  • Lütze
  • Metz
  • Murrelektronik
  • Phoenix
  • Pilz
  • Schalk
  • Schneider Electric
  • Siemens
  • WAGO
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