Electricity meters – how they work in practice
Electricity meters – how they work in practice
Electricity meters are a central part of every modern home installation. They record how much electricity is used and make it possible to monitor consumption accurately – both to ensure correct billing and to provide insight into energy habits. As more homes have smart electricity meters installed, it becomes easier to monitor and optimise electricity consumption in everyday life.
In this article, you’ll get an overview of how electricity meters work in practice, what types exist, and what you should consider if you’re choosing or replacing an electricity meter.
The article presents a selection of different electricity meters representing a wide range of functions and price levels. The aim is to provide an informative overview of the options available on the market so that you can assess which type best suits your needs. The product descriptions are based on publicly available information from manufacturers and retailers and are summarised to provide a neutral and clear picture of the individual models.
Factors to consider when buying an electricity meter
When choosing an electricity meter, there are several factors that can affect both functionality and usability.
1. Measurement principle and accuracy
Electricity meters can measure consumption in different ways – some via electromechanical systems, others digitally. Digital meters (often called smart meters) usually provide more accurate measurements and the possibility of remote reading. Make sure the meter meets the requirements of your installation and has the necessary approvals.
2. Communication and reading
Modern electricity meters can send data automatically to the electricity company via wireless signals or a network connection. If you want to monitor your own consumption in real time, you can choose a model with a display or app integration so that you can see the consumption directly on your smartphone.
3. Installation and compatibility
It is important to choose an electricity meter that fits your power grid and installation type (single-phase or three-phase). In many cases, the installation must be carried out by an authorised electrician, especially if the meter is to be connected directly to the main distribution board.
4. Features and data insight
Some electricity meters offer advanced features such as consumption statistics, time-differentiated measurement (day/night tariff), and integration with smart home systems. These features can be useful if you want to optimise your electricity consumption and reduce costs.
5. Price and quality
The price of electricity meters varies depending on technology and features. Simple models for basic use are often affordable, while advanced smart meters cost more but provide better insight and automation. Consider which features actually add value for you.
Products in focus
The Siemens Mechanical Hour Counter 230V 60Hz is a compact unit designed to record the total operating time of electrical systems. It works by counting hours when the unit is powered, providing an accurate overview of how long a device or machine has been in use.
The mechanical design makes it particularly suitable for environments where simplicity and operational reliability are prioritised. Since it does not require software or digital configuration, it is easy to install and use in many types of electrical cabinets and control systems.
The hour counter is part of Siemens' 7KT series (model 7KT5807) and is manufactured with a focus on long service life and stable performance. It can be used in both industrial and commercial installations where accurate recording of operating hours is required.
- Mechanical operating counter: Records operating time without the need for digital control.
- 230V, 60Hz: Designed for standard electrical installations with this voltage and frequency.
- Robust construction: Suitable for demanding environments requiring reliable operation.
- Easy installation: Can be integrated directly into cabinets and control systems.
- Long service life: Mechanical design without complex electronic components.
Pros and cons
- Reliable and maintenance-free design
- Easy to install and use
- No need for software or programming
- Suitable for industrial applications
- Lacks advanced features such as data collection or digital reading
- Limited to use at 230V and 60Hz
Pros and cons
Pros
- Reliable and maintenance-free design
- Easy to install and use
- No need for software or programming
- Suitable for industrial applications
Cons
- Lacks advanced features such as data collection or digital reading
- Limited to use at 230V and 60Hz
Pros
- Reliable and maintenance-free design
- Easy to install and use
- No need for software or programming
- Suitable for industrial applications
Cons
- Lacks advanced features such as data collection or digital reading
- Limited to use at 230V and 60Hz
Specifications
- Manufacturer: Siemens
- Model: 7KT5807
- Type: Mechanical hour counter
- Voltage: 230V
- Frequency: 60Hz
- EAN: 4001869311012
- Item number: 2904002
This mechanical timer from Siemens is designed to measure and record operating time in electrical circuits with a supply voltage between 10 and 27 volts DC. It is suitable for use in control cabinets, machines, and other industrial applications where precise time recording is required.
The unit is part of the Siemens 7KT series and comes in a compact format that makes it easy to integrate into existing installations. The mechanical design ensures stable operation without the need for software or external configuration.
With a weight of only 95 grams, the timer is easy to handle and install. It is developed to deliver reliable measurement over a long period, making it suitable for both new and existing installations.
- Supply voltage: 10–27 V DC
- Mechanical construction: Operation without the need for electronics or software
- Measurement function: Records operating time in kWh
- Compact design: Easy to integrate into cabinets and machines
- Low weight: Only 95 grams
Pros and cons
- Reliable and simple mechanical function
- Suitable for industrial and technical installations
- Requires minimal maintenance
- Easy integration into existing systems
- No digital functions or data output
- Limited to DC voltage between 10 and 27 volts
Pros and cons
Pros
- Reliable and simple mechanical function
- Suitable for industrial and technical installations
- Requires minimal maintenance
- Easy integration into existing systems
Cons
- No digital functions or data output
- Limited to DC voltage between 10 and 27 volts
Pros
- Reliable and simple mechanical function
- Suitable for industrial and technical installations
- Requires minimal maintenance
- Easy integration into existing systems
Cons
- No digital functions or data output
- Limited to DC voltage between 10 and 27 volts
Specifications
- Manufacturer: Siemens
- Model: 7KT5801
- Item number: 2904003
- EAN: 4001869310961
- Supply voltage: 10–27 V DC
- Measurement function: Power consumption
- Measurement unit: kWh
- Weight: 95 g
- Product type: Mechanical timer
The Siemens Contactor week 1sk 230V/50Hz is a synchronous time relay used to control electrical circuits according to a set time schedule. The unit is intended for installation in electrical panels and is suitable for applications where automatic control of lighting, heating, or other electrical loads is desired.
The contactor operates with an operating voltage of 230 volts at 50 hertz and has a single changeover contact (1SK). The synchronous motor ensures stable and precise timing function, making it suitable for continuous operation in professional installations.
With a compact design of 3 TE (modules), it fits into standard DIN rail installations. The product is part of the Siemens 7LF5300 series, known for reliability and long service life in industrial and commercial environments.
- Synchronous time relay: Provides precise and stable time control.
- Operating voltage 230V/50Hz: Standard for most electrical installations.
- 1 changeover contact: Enables simple circuit control.
- Compact design: 3 TE width for DIN rail mounting.
- Siemens 7LF5300 series: Known for reliability and quality.
Pros and cons
- Reliable and precise time control
- Compact format for panel mounting
- Suitable for automation of fixed installations
- Long service life and stable operation
- Requires fixed installation in electrical panel
- Not suitable for battery operation or mobile applications
Pros and cons
Pros
- Reliable and precise time control
- Compact format for panel mounting
- Suitable for automation of fixed installations
- Long service life and stable operation
Cons
- Requires fixed installation in electrical panel
- Not suitable for battery operation or mobile applications
Pros
- Reliable and precise time control
- Compact format for panel mounting
- Suitable for automation of fixed installations
- Long service life and stable operation
Cons
- Requires fixed installation in electrical panel
- Not suitable for battery operation or mobile applications
Specifications
- Manufacturer: Siemens
- Model: 7LF5300-6
- Item number: 2904009
- EAN: 4001869335759
- Type: Synchronous time relay / contactor
- Operating voltage: 230V / 50Hz
- Contact configuration: 1 changeover contact (1SK)
- Module width: 3 TE
- Measuring function: Power consumption
- Measuring unit: kWh
- Weight: 150 g
The Siemens Contactor day 1sk 230V/50Hz is a synchronous time relay used for automatic control of electrical circuits. The unit is equipped with a changeover contact and is intended for operation at 230 volts and 50 hertz.
The product is part of Siemens' range of components for panels and enclosures and is developed to deliver stable and precise time control in daily applications. The synchronous motor ensures accurate time function, making it suitable for fixed on/off cycles.
With a weight of 147 grams and a compact design, the contactor is easy to integrate into existing installations. It is a practical choice for controlling lighting, heating, or other electrical systems where repeated time intervals are desired.
- Synchronous time relay: Provides precise and stable time control.
- One changeover contact: Simple and efficient circuit control.
- 230V/50Hz operation: Standard voltage for most installations.
- Compact design: Easy to mount in panels and enclosures.
- Siemens quality: Known for reliability and long service life.
Pros and cons
- Reliable and precise time control
- Compact and lightweight design
- Easy integration into existing panels
- Suitable for daily on/off functions
- Only one changeover contact limits application possibilities
- Requires fixed installation and electrical connection
Pros and cons
Pros
- Reliable and precise time control
- Compact and lightweight design
- Easy integration into existing panels
- Suitable for daily on/off functions
Cons
- Only one changeover contact limits application possibilities
- Requires fixed installation and electrical connection
Pros
- Reliable and precise time control
- Compact and lightweight design
- Easy integration into existing panels
- Suitable for daily on/off functions
Cons
- Only one changeover contact limits application possibilities
- Requires fixed installation and electrical connection
Specifications
- Manufacturer: Siemens
- Model: 7LF5300-5
- Item number: 2904010
- EAN: 4001869335742
- Type: Synchronous time relay with 1 changeover contact
- Operating voltage: 230V / 50Hz
- Measuring function: Power consumption
- Measuring unit: kWh
- Weight: 147 g
Product descriptions
The Siemens Mechanical Hour Counter 230V 60Hz is a compact unit designed to record the total operating time of electrical systems. It works by counting hours when the unit is powered, providing an accurate overview of how long a device or machine has been in use.
The mechanical design makes it particularly suitable for environments where simplicity and operational reliability are prioritised. Since it does not require software or digital configuration, it is easy to install and use in many types of electrical cabinets and control systems.
The hour counter is part of Siemens' 7KT series (model 7KT5807) and is manufactured with a focus on long service life and stable performance. It can be used in both industrial and commercial installations where accurate recording of operating hours is required.
- Mechanical operating counter: Records operating time without the need for digital control.
- 230V, 60Hz: Designed for standard electrical installations with this voltage and frequency.
- Robust construction: Suitable for demanding environments requiring reliable operation.
- Easy installation: Can be integrated directly into cabinets and control systems.
- Long service life: Mechanical design without complex electronic components.
Pros and cons
- Reliable and maintenance-free design
- Easy to install and use
- No need for software or programming
- Suitable for industrial applications
- Lacks advanced features such as data collection or digital reading
- Limited to use at 230V and 60Hz
Pros and cons
Pros
- Reliable and maintenance-free design
- Easy to install and use
- No need for software or programming
- Suitable for industrial applications
Cons
- Lacks advanced features such as data collection or digital reading
- Limited to use at 230V and 60Hz
Pros
- Reliable and maintenance-free design
- Easy to install and use
- No need for software or programming
- Suitable for industrial applications
Cons
- Lacks advanced features such as data collection or digital reading
- Limited to use at 230V and 60Hz
Specifications
- Manufacturer: Siemens
- Model: 7KT5807
- Type: Mechanical hour counter
- Voltage: 230V
- Frequency: 60Hz
- EAN: 4001869311012
- Item number: 2904002
This mechanical timer from Siemens is designed to measure and record operating time in electrical circuits with a supply voltage between 10 and 27 volts DC. It is suitable for use in control cabinets, machines, and other industrial applications where precise time recording is required.
The unit is part of the Siemens 7KT series and comes in a compact format that makes it easy to integrate into existing installations. The mechanical design ensures stable operation without the need for software or external configuration.
With a weight of only 95 grams, the timer is easy to handle and install. It is developed to deliver reliable measurement over a long period, making it suitable for both new and existing installations.
- Supply voltage: 10–27 V DC
- Mechanical construction: Operation without the need for electronics or software
- Measurement function: Records operating time in kWh
- Compact design: Easy to integrate into cabinets and machines
- Low weight: Only 95 grams
Pros and cons
- Reliable and simple mechanical function
- Suitable for industrial and technical installations
- Requires minimal maintenance
- Easy integration into existing systems
- No digital functions or data output
- Limited to DC voltage between 10 and 27 volts
Pros and cons
Pros
- Reliable and simple mechanical function
- Suitable for industrial and technical installations
- Requires minimal maintenance
- Easy integration into existing systems
Cons
- No digital functions or data output
- Limited to DC voltage between 10 and 27 volts
Pros
- Reliable and simple mechanical function
- Suitable for industrial and technical installations
- Requires minimal maintenance
- Easy integration into existing systems
Cons
- No digital functions or data output
- Limited to DC voltage between 10 and 27 volts
Specifications
- Manufacturer: Siemens
- Model: 7KT5801
- Item number: 2904003
- EAN: 4001869310961
- Supply voltage: 10–27 V DC
- Measurement function: Power consumption
- Measurement unit: kWh
- Weight: 95 g
- Product type: Mechanical timer
The Siemens Contactor week 1sk 230V/50Hz is a synchronous time relay used to control electrical circuits according to a set time schedule. The unit is intended for installation in electrical panels and is suitable for applications where automatic control of lighting, heating, or other electrical loads is desired.
The contactor operates with an operating voltage of 230 volts at 50 hertz and has a single changeover contact (1SK). The synchronous motor ensures stable and precise timing function, making it suitable for continuous operation in professional installations.
With a compact design of 3 TE (modules), it fits into standard DIN rail installations. The product is part of the Siemens 7LF5300 series, known for reliability and long service life in industrial and commercial environments.
- Synchronous time relay: Provides precise and stable time control.
- Operating voltage 230V/50Hz: Standard for most electrical installations.
- 1 changeover contact: Enables simple circuit control.
- Compact design: 3 TE width for DIN rail mounting.
- Siemens 7LF5300 series: Known for reliability and quality.
Pros and cons
- Reliable and precise time control
- Compact format for panel mounting
- Suitable for automation of fixed installations
- Long service life and stable operation
- Requires fixed installation in electrical panel
- Not suitable for battery operation or mobile applications
Pros and cons
Pros
- Reliable and precise time control
- Compact format for panel mounting
- Suitable for automation of fixed installations
- Long service life and stable operation
Cons
- Requires fixed installation in electrical panel
- Not suitable for battery operation or mobile applications
Pros
- Reliable and precise time control
- Compact format for panel mounting
- Suitable for automation of fixed installations
- Long service life and stable operation
Cons
- Requires fixed installation in electrical panel
- Not suitable for battery operation or mobile applications
Specifications
- Manufacturer: Siemens
- Model: 7LF5300-6
- Item number: 2904009
- EAN: 4001869335759
- Type: Synchronous time relay / contactor
- Operating voltage: 230V / 50Hz
- Contact configuration: 1 changeover contact (1SK)
- Module width: 3 TE
- Measuring function: Power consumption
- Measuring unit: kWh
- Weight: 150 g
The Siemens Contactor day 1sk 230V/50Hz is a synchronous time relay used for automatic control of electrical circuits. The unit is equipped with a changeover contact and is intended for operation at 230 volts and 50 hertz.
The product is part of Siemens' range of components for panels and enclosures and is developed to deliver stable and precise time control in daily applications. The synchronous motor ensures accurate time function, making it suitable for fixed on/off cycles.
With a weight of 147 grams and a compact design, the contactor is easy to integrate into existing installations. It is a practical choice for controlling lighting, heating, or other electrical systems where repeated time intervals are desired.
- Synchronous time relay: Provides precise and stable time control.
- One changeover contact: Simple and efficient circuit control.
- 230V/50Hz operation: Standard voltage for most installations.
- Compact design: Easy to mount in panels and enclosures.
- Siemens quality: Known for reliability and long service life.
Pros and cons
- Reliable and precise time control
- Compact and lightweight design
- Easy integration into existing panels
- Suitable for daily on/off functions
- Only one changeover contact limits application possibilities
- Requires fixed installation and electrical connection
Pros and cons
Pros
- Reliable and precise time control
- Compact and lightweight design
- Easy integration into existing panels
- Suitable for daily on/off functions
Cons
- Only one changeover contact limits application possibilities
- Requires fixed installation and electrical connection
Pros
- Reliable and precise time control
- Compact and lightweight design
- Easy integration into existing panels
- Suitable for daily on/off functions
Cons
- Only one changeover contact limits application possibilities
- Requires fixed installation and electrical connection
Specifications
- Manufacturer: Siemens
- Model: 7LF5300-5
- Item number: 2904010
- EAN: 4001869335742
- Type: Synchronous time relay with 1 changeover contact
- Operating voltage: 230V / 50Hz
- Measuring function: Power consumption
- Measuring unit: kWh
- Weight: 147 g
Different types of electricity meters
Electricity meters come in several variants, each with its own advantages depending on the area of use and needs.
1. Mechanical electricity meters
The classic mechanical electricity meters with a rotating disc have been standard for many years. They are reliable and require minimal maintenance but do not allow digital reading or data collection.
2. Electronic electricity meters
These meters use electronic circuits to record electricity consumption. They are more accurate than mechanical models and often have a digital display showing real-time consumption.
3. Smart meters
Smart meters are the latest generation of electricity meters. They can communicate directly with the electricity company and give the user access to detailed consumption data via an app or web portal. They make it easier to identify energy-intensive devices and adjust consumption according to electricity prices.
4. Sub-meters
Sub-meters are usually used to measure consumption in individual parts of an installation – for example, in a flat, a rental room, or a specific machine. They are useful if you want to allocate costs or monitor consumption on specific devices.
Different brands of electricity meters
The market for electricity meters includes a number of manufacturers, each specialising in different types and technologies.
Kamstrup
Kamstrup is a Danish manufacturer known for its intelligent metering systems for electricity, water, and heat. Their electricity meters are widely used in both private and commercial installations and offer high accuracy and advanced data management.
Landis+Gyr
Landis+Gyr is an international manufacturer focused on smart metering solutions. Their electricity meters are widespread in many countries and support advanced communication and energy management.
Schneider Electric
Schneider Electric offers a wide range of electricity meters, from simple models to advanced energy monitoring systems. The brand is known for quality and integration with other electrical components in buildings.
Siemens
Siemens manufactures both industrial and residential electricity meters with a focus on precision and reliability. Their products are often used in larger installations where high measurement accuracy is required.
Carlo Gavazzi
Carlo Gavazzi offers compact and user-friendly electricity meters often used in smaller commercial installations and smart home solutions. They are known for combining functionality with ease of use.
Frequently asked questions
What is the difference between a regular electricity meter and a smart meter?
A regular electricity meter only shows total consumption, while a smart meter continuously records data and automatically sends it to the electricity company. Smart meters also allow you to monitor consumption in real time.
Should I install an electricity meter myself?
No, installation of electricity meters should normally be carried out by an authorised electrician. This ensures correct connection and compliance with safety regulations.
How do I read my electricity meter?
Digital electricity meters display consumption on a screen, while older models are read manually by noting the numbers on the counter. Smart meters automatically send data to the electricity company, so you don’t need to read them yourself.
Can I use an electricity meter to monitor individual appliances?
Yes, with sub-meters or plug-in electricity meters you can measure consumption on specific appliances or circuits. This can be useful for identifying where you can save electricity.
How long does an electricity meter last?
The lifespan depends on the type and usage, but most electricity meters have an expected lifespan of 10–20 years. Smart meters may require software updates over time to remain compatible with new systems.
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