Internal accessories
Auxiliary contact: The auxiliary contact is the contact mechanically linked by the main circuit of the circuit breaker, which is mainly used for the display of the circuit breaker opening and closing status, and is connected to the control circuit of the circuit breaker through the opening and closing of the circuit breaker to control or interlock its related electrical appliances. For example, it outputs signals to traffic lights, relays, etc. The rated current of the shell frame of the molded case circuit breaker is 100A for the single break conversion contact, and the bridge contact structure for 225A and above, and the agreed heating current is 3A; The rated current of the shell frame level is 400A and above, and it can be installed with two normally open and two normally closed, and the agreed heating current is 6A. The number of operational performance is the same as the total number of operational performance of the circuit breaker.
Alarm contact: the alarm contact used for the circuit breaker accident, and this contact only acts when the circuit breaker trips and breaks, mainly used for the load of the circuit breaker when there is an overload, short circuit or undervoltage and other faults and free tripping, the alarm contact is converted from the original normally open position to the closed position, and the indicator light or electric bell and buzzer in the auxiliary line are turned on, and the fault trip status of the circuit breaker is displayed or reminded. Because the probability of the circuit breaker tripping freely due to load failure is not too much, the life of the alarm contact is 1/10 of the life of the circuit breaker. The working current of the alarm contact generally does not exceed 1A.
Shunt tripper: It is a kind of tripper excited by a voltage source, and its voltage can be independent of the main circuit voltage. The shunt tripper is an accessory for long-range manipulation of the switch. The circuit breaker can be reliably disconnected when the supply voltage is equal to either between 70% and 110% of the rated control supply voltage. The shunt tripper is a short-time working system, and the coil energizing time generally cannot exceed 1S, otherwise the wire will be burned. In order to prevent the coil from burning out, the molded case circuit breaker is connected in series with a micro switch in the shunt trip coil, when the shunt tripper is engaged through the armature, the micro switch is converted from normally closed to normally open, because the control line of the power supply of the shunt tripper is cut off, even if the button is artificially pressed, the shunt coil is never energized to avoid the occurrence of coil burning. When the circuit breaker is snapped back on, the micro switch is back in the normally closed position.
When the power supply voltage drops (or even slowly drops) to the range of 70% to 35% of the rated working voltage, the undervoltage tripper should operate, and the undervoltage tripper should be able to prevent the circuit breaker from closing when the power supply voltage is equal to 35% of the rated working voltage of the tripper; When the power supply voltage is equal to or greater than 85% of the rated working voltage of the undervoltage tripper, the circuit breaker should be able to close reliably under hot conditions. Therefore, when a certain voltage drop occurs in the power supply voltage in the protected circuit, the circuit breaker can be automatically disconnected to cut off the power supply, so that the load electrical appliances or electrical equipment below the circuit breaker are protected from damage by undervoltage. When in use, the under-voltage tripper coil is connected to the power supply side of the circuit breaker, and the circuit breaker can be closed only after the under-voltage tripper is energized, otherwise the circuit breaker cannot be closed.
External attachments
Electric operating mechanism: It is an accessory for long-distance automatic opening and closing circuit breaker, the electric operating mechanism has two kinds of motor operating mechanism and electromagnet operating mechanism, the motor operating mechanism is a molded case circuit breaker shell frame grade rated current 400A and above circuit breaker, the electromagnet operating mechanism is suitable for molded case paging block shell frame grade rated current 225A and below circuit breaker, whether it is an electromagnet or a motor, their suction and rotation direction are the same, Only by the position of the cam inside the electric operating mechanism to achieve the closing and dividing, the circuit breaker should be able to ensure the reliable closure of the circuit breaker when operating with the electric mechanism, at any voltage between 85% and 110% of the rated control voltage.
Rotating operating handle: suitable for molded case circuit breaker, the mechanism of rotating operating handle is installed on the cover of circuit breaker, the rotating shaft of the handle is installed in its mechanism matching hole, the other end of the rotating shaft passes through the door hole of the chest of drawers, the handle of rotating handle is installed on the rotating shaft head exposed above the door of the complete set of devices, and the circular or square seat of the handle is fixed with screws on the door, so that the operator can rotate clockwise or counterclockwise through the handle of the handle outside the door to ensure the closing or opening of the circuit breaker. At the same time, turning the handle can ensure that the cabinet door cannot be opened when the circuit breaker is closed; The door of the switch plate can only be opened if the handle is turned open or re-buckled. In an emergency, when the circuit breaker is "closing" and the door panel needs to be opened, the red release button on the side of the handle seat can be pressed.
Extended handle: It is an external extended handle, which is directly installed on the handle of the circuit breaker, and is generally used for manual opening and closing operation on large-capacity circuit breakers of 600A and above.
Handle locking device: It is to install a clamp on the handle frame, punch a hole in the handle and lock it with a padlock. It is mainly used when the circuit breaker is in the closed working state, and other people are not allowed to open the circuit and cause a power outage, or when the circuit breaker load side needs to be repaired or is not allowed to be energized, in order to prevent the circuit breaker from being mistakenly closed, so as to protect the safety of maintenance personnel or the reliable use of electrical equipment.
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Tianyi switch button - the color meaning of the button and indicator light and the place of use
1. Buttons
1. Red
Operation in hazardous situations. It is often used for emergency stops
Stop and break. It is often used to stop all machines, stop one or more motors, stop a certain part of a piece of equipment, make the electrical components lose power, and have a stop function reset button.
...
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Tianyi switching power supply troubleshooting
1. Check the key points:
1) Whether the voltage at point B is 310V.
2) Whether the 15V voltage is normal.
3) Whether the voltage at point C is greater than 14V.
4) Whether the SS terminal of (8) pin IC6 is higher than 10V, whether the SD terminal of pin (10) is lower than 0.6V, and whether there is a square wave transmission at pin 13 and pin 14 ...
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Tianyi switch - the precautions required for the operation of dual power automatic transfer switch
1. When closing, first of all, attention should be paid to check that the circuit breaker that can be connected to the dual-power automatic transfer switch is indeed in the opening position, and then quickly operate the risk isolation switch to close it (whether the enterprise adopts manual management agency or leveraged financial institution personnel operation), but ...
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Tianyi switch - the high and low voltage division of low voltage switch
36V is a safe voltage, but it cannot be used as a standard for dividing high and low voltages. There are two ways to divide high and low pressure:
1. According to the rated voltage: the rated voltage is 1000V and below is called low voltage; The rated voltage of 1000V or more is called high voltage.
2. According to the voltage of the equipment to the ground...
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Tianyi switch - a measure to reduce the ripple and noise voltage of the switching power supply
Reduces EMI interference
The metal shell is used as a shield to reduce the interference of external electromagnetic field radiation. To reduce electromagnetic interference from the power line input, an EMI filter is added to the power supply input.
At the output, capacitors with good high-frequency performance and low ESR are used
The use of polymer solids ...
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Tianyi switch - the air switch is always the reason for tripping
1. The current value of the air switch is too low, and the load power is greater than the rated power of the air switch.
2. The load joint is not firm, and the joint is not compressed.
3. If there is a short circuit in the line, check whether the electrical plug is dry.
4. The line is aging and leaking, resulting in both the live wire and the neutral line.
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Tianyi switch - the operation method of dual power automatic transfer switch
First, first place the dual power supply on the adjustment table, and the phase wire and the neutral wire (neutral line) are docked in place, and can not be connected wrongly.
Second, after the line is connected, it is necessary to check the installed line, and then turn on the main switch of the debugging station to turn on the common and standby working power supply.
Three, when the double ...
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What requirements should be met by Tianyi switch - disconnector?
(1) The disconnector should have an obvious disconnection point, which is easy to identify whether the electrical appliance is disconnected from the power grid.
(2) There should be reliable insulation between the disconnect points of the disconnector, that is, there should be enough distance between the disconnect points of the disconnector to ensure that it can work reliably under harsh climatic conditions, and ...
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What should be paid attention to in the design of Tianyi switch - switching power supply?
1. Wiring
The design requirements of wiring are very strict in the design of switching power supplies, and they must be done well to pass the test. If the designer does not handle the wiring work in the early stage of design, there will be great safety hazards in the future electricity consumption. So here I recommend you to buy a switching electric ...
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Tianyi switch - the role of the travel switch (limit switch) and its working principle
The scope of use of the travel switch (limit switch).
The range of use of travel switches (limit switches) is very wide, so what is the effect of travel switches (limit switches)? The position switch (limit switch) refers to the maintenance of the micro switch from external forces, oil, water, gas, ...
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Tianyi switch - what are the functions of limit switches?
1. Protection
The most important role of the limit switch must be its protection effect, the limit switch is also known as the travel limit switch, which is mainly used to control the stroke of mechanical equipment and limit protection. In practice, the travel limit switch is installed in a pre-arranged position, and the travel limit switch is installed in a pre-arranged position.
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Tianyi switch - the difference between high-voltage load switch and high-voltage circuit breaker
1. The high-voltage load switch can be used as a load switch, which has the effect of self-extinguishing arc, but its breaking volume is very small and very limited.
2. The high-voltage isolation switch generally cannot be used as a load switch. There is no arc extinguishing cover in the structure, and there are also disconnectors that can switch loads on and off, but the structure is different from load switches ...
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Tianyi switch - the classification of proximity switches and their introduction
(1) Eddy current proximity switch
This type of switch is sometimes called an inductive proximity switch. It is the use of conductive objects when they are close to the proximity switch to produce eddy currents inside the object. This eddy current reacts to the proximity switch, causing the internal circuit parameters of the switch to change, so as to identify the presence or absence of ...
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Tianyi switch - the term introduction of limit switches
Pre-stroke - indicates the distance or angle at which the actuator on the limit switch must move before tripping the switch contact
Operating Point - Indicates the position of the actuator when the switch contact is moved to the working position
Release Point - Indicates the position of the actuator when the contact returns to its original state
Differential - ...
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Tianyi switch - the difference between C type and D type of air switch
The meaning is different, the scope of application is different, and the role is different.
Air opening C represents the current, and the D model represents the power. The scope of use is different. If it is a household electricity, the air switch of the C model is generally chosen. The role is different. Type C it is used for home lighting use, Type D is suitable for ...
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Tianyi switch - the characteristics of low-voltage isolation switch
1. When overhauling electrical equipment, provide an electrical interval and a visible disconnection point to ensure the personal safety of maintenance personnel.
2. The disconnector can not be operated with load: it cannot be operated with rated load or large load, and it cannot be divided or combined with load current and short circuit current.
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Tianyi switch - what is the difference between proximity switch PNP and NPN?
The so-called PNP and NPN proximity switches are for the type of DC three-wire proximity switch output transistor, and even though many proximity switch output stages use MOS transistors, they are still called the same.
Differences: PNP type proximity switch: The type of proximity switch output transistor is P...
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Tianyi switch - dual power supply automatic transfer switch normal working conditions
1) Ambient air temperature: The upper limit of ambient air temperature is +40°C, the lower limit of ambient air temperature is -5°C, and the average value of ambient air temperature for 24h does not exceed +35°C
2) Altitude: The altitude of the installation site does not exceed 2000m.
3) Atmospheric conditions: Atmospheric relative humidity in the surrounding air ...
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Tianyi switch - the characteristics and classification of load isolation switch
First, the characteristics of the load switch
A load switch is a switchgear between a circuit breaker and an isolation switch. It has a simple arc extinguishing device, which can cut off the rated load current and a certain overload current, but cannot cut off the short-circuit current
Second, the classification of load switches
According to the operating voltage ...
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Tianyi switch - the performance and main features of dual power automatic transfer switch
performance
1. Adopt double-row composite contacts, cross-connected mechanisms, micro-motor pre-energy storage and micro-electronic control technology, basically achieve zero arcing (no arc extinguishing cover);
2. Adopt reliable mechanical interlocking and electrical interlocking technology;
3. Adopt zero-crossing technology;
4、 ...
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