Solid state relay is a non-contact electronic switch with isolation function, no mechanical contact parts in the switching process, so in addition to having the same function as electromagnetic relay, solid state relay also has logic circuit compatibility, vibration resistance and mechanical impact resistance, unlimited installation position, good moisture-proof, mildew-proof and anti-corrosion performance, excellent performance in explosion-proof and ozone pollution prevention, small input power, high sensitivity, small control power, good electromagnetic compatibility, low noise and high working frequency.
(1) SSR has no mechanical parts inside, and the structure adopts the infusion and full sealing method, so SSR has the advantages of vibration resistance, corrosion resistance, long life and high reliability, and its switching life is as high as 10.1 million times;
(2) Low noise: AC SSR adopts zero-crossing trigger technology, so it effectively reduces the voltage rise rate dv/dt and current rise rate di/dt values on the line, so that the SSR has little interference to the mains power supply when working for a long time;
(3) The switching time is short, about 10ms, and can be used in occasions with high frequency;
(4) Photoelectric isolation is adopted between the input circuit and the output circuit, and the insulation voltage is above 2500V;
(5) The input power consumption is very low, and it is compatible with TTL and COMS circuits;
(6) There is a protection circuit at the output end;
(7) Strong load capacity.
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Siemens APT Relays – The difference between solid state relays and intermediate relays
First, the solid-state relay has no contacts and coils in the structure, which can be opened and closed at a high frequency and will not produce sparks, and has a long service life;
Second, the intermediate relay is generally only used for the control loop, and cannot work with load, and will make a "pop" sound when it is sucked in;
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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 Relays - the main product technical parameters of relays
(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.
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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 Relays – The difference between solid state relays and intermediate relays
First, the solid-state relay has no contacts and coils in the structure, which can be opened and closed at a high frequency and will not produce sparks, and has a long service life;
Second, the intermediate relay is generally only used for the control loop, and cannot work with load, and will make a "pop" sound when it is sucked in;
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Siemens APT Relays – the solution to common faults in solid state relays
1. The simplest and most effective way is to use a new solid state relay.
2. The other is to determine the voltage of the coil to avoid the voltage provided by the coil being less than the operating voltage.
3. Check whether the polarity is reversed.
4. Reasonable power-on time for the solid state relay coil, if ...
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ALH-0.66 series transformer FAQ
1. What is the maximum voltage that can be used for an ALH transformer?
AC low voltage up to 720V
2. Is there a protective grade product for ALH transformers?
II-P AND III-P are available in both protective grades
3. What is the maximum primary current of ALH transformer?
The maximum primary side current is 8 ...
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Siemens APT Relays – The difference between signal relays and power relays
Signal relays are used more in secondary maintenance circuit circuits. It tells the right people exactly what is wrong with the maintenance. The power relay is a bit like a discriminant sentence in mathematics. When a constant is entered, the satisfactory and unsatisfactory conditions will output different results. Merit...
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Siemens APT transformer - the use, principle and selection of current transformer
The principle of the current transformer is based on the principle of electromagnetic induction. A current transformer is composed of a closed core and windings. Its primary side winding turns are very small, string in the line of the current that needs to be measured, so it often has all the current of the line flowing through, the number of turns of the secondary side winding is relatively large, and the series ...
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Siemens APT current transformer - how to choose a current transformer?
First, the principle of primary parameter selection of current transformer
The rated primary current of the current transformer is determined by the actual load of the tested circuit, and the rated primary current of the current transformer should not be less than the rated primary current of the circuit.
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Siemens APT current transformer - introduction to the classification of current transformers
Categorized by use
According to different uses, current transformers can be roughly divided into two categories:
Current transformer for measurement (or measurement winding of current transformer): provides current information of the power grid to measurement, metering and other devices within the normal working current range.
Protecting Electricity ...
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Siemens APT Pushbutton Switches - Introduction to the types of metal pushbutton switches
Common types of metal button switches include self-locking switches, self-reset switches, knob gear switches, lever gear switches, locking switches, etc.; Because the metal button switch is small in size, easy to install, metal material, voltage can be used from 9-220V, and the appearance of metal texture ...
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Siemens APT Current Transformer - The difference between voltage transformer and current transformer
The difference between the voltage transformer and the current transformer in terms of effect principle The primary difference is that the operating conditions are very different during normal operation, and the main performance is as follows:
1) The current transformer can be short-circuited twice, but it cannot be opened; The voltage transformer can be opened twice, but it must not be short-circuited
2) ...
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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 Relays - Common Problems and Solutions of Relays
First, the contact is loose and cracks
The contact is the electrical contact part of the relay to complete the switching load, and the contact of some products is riveted and pressed, and its main drawbacks are loose contacts, cracked contacts or excessive dimensional position deviation. This will affect the contact reliability of the relay. Shovel appears ...
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Siemens APT Relays – Analysis of Common Faults and Causes of Relays
1. Overhaul of the sensing mechanism
For electromagnetic (voltage, current, intermediate) relays, the sensing mechanism is the electromagnetic system. The faults of the electromagnetic system are mainly concentrated in the coil and the moving and static iron cores.
(1) Coil fault maintenance
Coil failure usually has a coil absolute...
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Siemens APT Relays – How to Choose the Right Power Relay
1. Measure the resistance of the contact
Use the resistance level of the universal meter to measure the resistance of the normally closed contact and the moving point, and its resistance value should be 0, (the contact resistance value can be measured in a more accurate way within 100 milliohms); The resistance between the normally open contact and the moving point is infinite. From this, it can be distinguished which is a normally closed contact ...
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Siemens APT current transformer - classification of current transformer and its function
1. Current transformers are classified according to the installation method
According to the installation method, the current transformer can be divided into through-type current transformer, pillar type current transformer, bushing type current transformer, and busbar type current transformer.
Through-type current transformer: used to pass through the screen or wall...
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Siemens APT transformer – common faults and analysis of voltage transformers
(1) The insulation between the iron chips is damaged
Problem: The temperature rises during operation.
Possible causes of the problem:
(1) Poor insulation between iron chips
(2) The use of harsh environmental conditions or long-term operation at high temperature to promote the aging of insulation between iron chips.
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Siemens APT current transformer - what need to be paid attention to in the use of current transformer
1. The secondary side of the current transformer shall not be open when working. Due to the small secondary impedance of the current transformer, the secondary side of the current transformer is close to the short-circuit state during normal operation. When the secondary side is open, a high voltage will be induced, which endangers the safety of people and equipment.
2. Electricity ...
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