Siemens APT Relays – What are the forms of protection 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.

1. When selecting the solid-state relay used in the printed circuit board with small current specifications, because the lead terminal is made of high thermal conductivity material, the soldering should be carried out under the condition that the temperature is less than 250 °C and the time is less than 10S.

(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. （ ...

When the solid state relay is open and there is voltage at the load end, there will be a certain leakage current at the output end, and care should be taken to prevent electric shock when using or designing. When the solid-state relay fails to be replaced, the original model or the product with the same technical parameters should be selected as far as possible, so as to match the original application line and ensure that the system ...

01 The role is different Proximity switches are contactless switches with a long life and are suitable for "pass-through signals". The travel switch is also known as the limit switch, the travel switch and the limit switch are both position switches, but the travel switch can detect the stroke, and can be used as an input signal to control the circuit at a certain distance ...

1. What are the installation methods of ALS limit switches? Usually the limit switch is divided into front of the board installation or board back installation, all of which are installed by screws. 2. What are the different modes of limit switch action? According to the action mode of the limit switch head, it is divided into ...

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.

1. What are the basic combination colors of combination lights? Red, yellow, green, blue, white, bicolor. 2. What are the different types of combination light panes? F, H, L, V, G any combination 3. Is the lampshade detachable? OK 4. Combination light ...

The excitation current is the main cause of the error of the current transformer, so reducing the excitation current can reduce the error (1) The core is made of materials with high permeability, because the magnetic properties of the core not only affect the ratio difference and angular difference, but also affect the saturation multiple. (2) Increase the cross-section of the iron core and shorten the magnetic circuit.

1. The control box is made of ABS and PC, which material has better flame retardant performance? ABS has good flame retardant performance. 2. What are the certifications for the control box? 3C & CE (for unperforated control box only) 3. What is the color of the grey cabinet of the control box? Work...

When the current transformer is finalized and its internal parameters are determined, the magnitude of the error will be affected by the secondary current (or primary current), secondary load, power factor, and frequency. These factors are called external factors, and the error of the current transformer in operation is mainly affected by these four factors. ...

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, and good anti-...

1. The reason for the frequent disconnection of the coil: whether the solid state relay is cleaned with ultrasonic, whether the coil is overvoltaged, etc., will cause the coil to be disconnected. 2. The reason for the insufficient power supply of the coil: First, it is necessary to confirm the voltage of the solid state relay coil. If the voltage supplied to the coil is lower than ...

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 ...

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 ...

1. Electromagnet: The electromagnet of high and low voltage relay is usually composed of two parts: coil and core. When the high and low voltage relay inputs the electrical signal, the electromagnet coil will generate electromagnetic force, drive the iron core, and realize the on/off control of the relay. 2. Contact group: The contact group is a high and low voltage relay control ...

1. What are the current specifications of universal transfer switches? At present, there are four forms: 10A, 16A, 25A, and 63A 2. What are the positioning angles of the universal transfer switch? At present, it is divided into four angles: 30°, 45°, 60° and 90° 3. There is no customer's ...

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.

1. The position of the auxiliary contact is not suitable. After the switch has been tripped, the mechanical part has moved, worn phenomenon, resulting in the auxiliary contact position offset to the correct position, in the protection action tripping, when the auxiliary contact is not disconnected, the outlet electrical appliances, electrical appliances, relays have returned, and it is ...

1. Regular cleaning: The relay needs to be cleaned regularly with dust and dirt to keep its surface clean and smooth. It can be cleaned with a clean cloth or brush, and detergents containing acids and bases should be avoided. 2. Check the wiring: The wiring of the relay needs to be fastened firmly, and the contact ...