(1) Rated working voltage: refers to the voltage required by the coil when the relay is working normally. Depending on the type of relay, it can be either AC voltage or DC voltage.
(2) DC resistance: refers to the DC resistance of the coil in the relay, which can be measured by a multimeter.
(3) Pick-up current: refers to the minimum current that the relay can produce a pick-up action. In normal use, the given current must be slightly greater than the pick-up current in order for the relay to work stably. For the working voltage of the coil, generally do not exceed 1.5 times of the rated working voltage, otherwise a large current will be generated and the coil will be burned.
(4) Release current: refers to the maximum current of the relay to produce the release action. When the current in the relay engagement state decreases to a certain extent, the relay will return to the unenergized release state, and the current at this time is much smaller than the engaging current.
(5) Contact switching voltage and current: refers to the voltage and current allowed to be loaded by the relay. It determines the size of the voltage and current that the relay can control, and it cannot exceed this value when used, otherwise it is easy to damage the contacts of the relay.
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Siemens APT Relays - Installation Precautions for High and Low Voltage Relays
1. Choose the right relay: When choosing a high and low voltage relay, you should choose the right product according to your needs, such as selecting according to the rated voltage, current and other information
2. Installation location: high and low voltage relays should be installed in dry, ventilated, non-corrosive gas, less dusty areas, ...
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Siemens APT current transformer - working principle and characteristics of current transformer
How a current transformer works
The principle of current transformer is based on the principle of electromagnetic induction. A current transformer is composed of a closed core and windings. It has a small number of turns on the primary side winding, stringed in the line where the current needs to be measured, so it often has the full current of the line ...
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Siemens APT Relays – an introduction to the new type of relay
The new relay refers to the electromagnetic relay developed and produced in order to meet the special requirements of the new and meet the use of special environmental conditions, its main characteristics are small size, light weight, vibration resistance, shock resistance, load range from low level load to 5A, 28 V rated load, product ...
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Siemens APT PB3 series of quick-fit pushbuttons wins CAIMRS "Automation Innovation Award"
On August 26, the CAIMRS2022 China Automation + Digital Industry Annual Conference was held in Beijing. Based on the fields of automation, digitalization, industrial robotics and industrial interconnection, this conference shared top digital innovation ideas, discussed the latest trends in the industry, and how to grasp the new round of science and technology.
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Siemens APT current transformer - common faults and solutions of current transformers
1. There is an abnormal noise or over-temperature of the iron core
Cause of failure: When the current transformer is in operation, if there is an open circuit or overload in the secondary circuit, it will lead to abnormal sound and over-temperature of the core.
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Siemens APT limit switches – what are the limits used for?
daily life
There are many applications of travel switches, and it is found in many electrical appliances. So what does such a simple switch do? It mainly plays the role of chain protection. The most common example is its use in washing machines and tape recorders (VCRs). ...
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Siemens APT warning light - the role of LED warning light in life
LED warning light function
1. The luminous method selection items are: solid light, shiny, burst flash, constant/shiny mix.
2. The installation base is: L rod, straight rod, folding, and barrel type.
Effect of LED warning light_Effect in different scenes
1. Construction unit
On the road ...
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Siemens APT Relays - a detailed introduction to the classification of relays
Classified according to the working principle or structural characteristics of relays:
1) Electromagnetic relay: an electrical relay that works by using the suction force generated by the current in the input circuit between the electromagnet core and the armature.
2) Solid state relay: refers to the electronic components that perform their functions without mechanical ...
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Siemens APT current transformer – the basis for whether the current transformer is damaged or the measurement is inaccurate
1. The inspection basis for whether the current transformer is damaged:
1. The basis for checking whether the polarity is damaged:
The primary winding of the current transformer is marked P1 and P2, and the secondary winding is marked as S1 and S2. If P1 and S1 are the same name, then this sign is called reduced polarity. Primary current from P1 ...
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Siemens APT current transformer - how to see the multiple of the current transformer
1. Most of the multiple values can be seen from the nameplate attached to the instrument, which will show the style of the value/value, which can be known by dividing the previous value by dividing the back value when calculating the standard core-piercing turns. If the actual number of turns of the grommet does not conform to the standard, then the multiple should be ...
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Siemens APT LA39 series button FAQ
1. What are the installation methods of LA39-A/B/C button?
There are five types in total: the Z1 diagonal screw unit, the Z2 straight screw unit, the Z3 nut device with fastening screws, the Z4 nut device without fastening screws, and the Z5 quick and convenient one-handed device
2. LA39 series products can be used ...
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Siemens APT Relays – Components of Solid State Relays
Solid state relays consist of three parts: the input circuit, the isolation (coupling), and the output circuit.
Input circuitry
According to the different categories of input voltage, the input circuit can be divided into three types: DC input circuit, AC input circuit and AC and DC input circuit. Some input control circuits are also ...
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Siemens APT Relays – The difference between AC relays and DC relays
1. Structural characteristics of AC relays
The coil of the AC relay is shorter, and the wire diameter is thicker, mainly because the coil is passed through the alternating current, the reactance is larger, and the thick wire diameter can reduce the internal resistance and reduce the heat generation.
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Siemens APT new x. The new product of R series relay was released
On May 8, 2019, APT held a grand online conference in Shanghai, Beijing, Guangzhou, Nanjing, Changsha and Tiantai...... and more than 20 cities across the country witnessed the new Siemens APT x. The new product of R series relay was released.
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Siemens APT Relays - Maintenance Methods for Solid State Relays
1. The influence of the ambient temperature
The load capacity of the solid state relay is greatly affected by the ambient temperature and its own temperature rise, during the use of the device, it should be ensured that it has good heat dissipation conditions, the rated working current of more than 10A products should be equipped with radiators, and the products above 100A should be dissipated.
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Siemens APT Relays – Principles and characteristics of photorelays
When the input quantity (such as voltage, current, temperature, etc.) reaches the specified value, the controlled output circuit is turned on or off an electrical appliance. It can be divided into two categories: electrical (such as current, voltage, frequency, power, etc.) relays and non-electrical (such as temperature, pressure, speed, etc.) relays. With action ...
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Siemens APT - AD16 series indicator frequently asked questions
1. Why does the indicator light still glow after the control power supply has been disconnected?
This situation is caused by the presence of interference voltage, and this problem can be solved by ordering our anti-interference indicator light
2. What are the operating hours of the AD16 series indicators?
More than 30000 small ...
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Siemens APT - FM series metal button indicator frequently asked questions
1. Which series of metal buttons can produce two-color buttons with light?
FM25N
2. Which series can produce knobs?
FM-N series
3. Which type of metal illuminated button needs an external resistor for step-down?
FM16E
4. What is the material of the shell ...
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Siemens APT current transformer – the difference between the ratio on a current transformer and the ratio on a watt-hour meter
1. Differences in use
The conversion ratio of the current transformer is inconsistent with the transformation ratio of the ammeter, which will lead to the inability to use the displayed value of the ammeter directly, and the proportional conversion must be carried out;
If the transformer of ratio 5 is used on the meter of ratio 1, the secondary current of CT will generally exceed 1A, so that the transformer of 5 is used on a meter of 1 ratio. Than 1 ...
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Siemens APT current transformer - inspection content of current transformer
1. Regularly check whether the current transformer is overheated, check whether there is discoloration in the terminal, and check whether there are sundries in the terminal box.
2. Check whether there is oil leakage in the oil level gauge in time to ensure that the oil level meets the use standard and there is no oil leakage.
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