Selection of the circuit breaker

Selection of the circuit breaker The selection of the air switch
Circuit breaker, full name automatic air circuit breaker, also known as air switch, is a commonly used low-voltage protection appliances, can achieve short circuit, overload and other functions.
The circuit breaker is used in the home power supply for the total power protection switch or branch line protection switch. When the residential circuit or household appliances short circuit or overload, it can automatically trip, cut off the power, so as to effectively protect the equipment from damage or prevent accidents.
Households generally use two-pole (ie 2P) circuit breakers for total power protection, with a single pole (1P) for branch protection.
If the choice of the circuit breaker is too small, the circuit breaker is prone to frequent tripping, causing unnecessary power failure, such as the choice is too large, then the desired protection effect, so the home improvement circuit breaker, the correct choice of rated capacity current size is very important.
10A, 25A, 32A, 50A, 63A, 80A, 100A, etc .; then the general family how to choose or check the total load current of the total value of it?
1, first calculate the value of each branch current
① pure resistive load, such as bulbs, electric heaters, etc. with the specified power directly divided by the voltage that is,
Formula I = Power / 220v;
Such as 20w bulb, branch current I = 20W / 220 = 0.09A
Electric water heaters, electric heaters, rice cookers, electric woks, vacuum cleaners, air conditioners, etc. are resistive loads. Electric water heaters, electric heaters, electric cookers, electric cookers, vacuum cleaners,
How to choose a circuit breaker This is a professional technical problem. Briefly said that you can choose from the following 6: 1, first according to the rated voltage selection, the rated voltage to be consistent. 2, the rated current of the circuit breaker is greater than or equal to the rated current of the circuit used. 3, the rated breaking current of the circuit breaker is greater than or equal to the short circuit current of the circuit used. 4, according to environmental conditions, such as altitude, temperature, humidity, choose to meet the requirements of the circuit breaker. 5, according to the quality of the brand selection, cost-effective circuit breakers. 6, the special break off the situation, to check the circuit breaker. However, different loads should use different types of circuit breakers.
The principle of air switch selection
1, according to the requirements of the line to protect the circuit breaker to determine the type and form of protection – to determine the use of frame type, device type or flow limit and so on.
2, the rated voltage of the circuit breaker UN should be equal to or greater than the rated voltage of the protected circuit.
3, circuit breaker undervoltage release rated voltage should be equal to the rated voltage of the protected circuit.
4, the rated current of the circuit breaker and the rated current of the overcurrent release shall be greater than or equal to the calculated current of the protected circuit.
5, the circuit breaker limit breaking capacity should be greater than the line of the maximum short-circuit current RMS.
6, the distribution line in the lower and lower circuit breaker protection characteristics should be coordinated with the protection of the lower level should be located in the lower level of protection features and do not intersect.
7, the circuit breaker long delay trip current should be less than the conductor to allow continuous current.

What is an Automotive Relay?

Automotive Relays
What is an Automotive Relay?

Automotive relays of different sizes are found in every type of land or sea vehicle. They are often used to enable a low amperage circuit to switch a higher amperage circuit on or off. An example would be turning headlights on. Automotive relays also allow items to switch at the same time by using a single output, therefore allowing one to simultaneously open and/or close continuity on multiple items.
Types of Automotive Relays

Choose from more than 200 automotive relays available from Binder Electric, offering one of the most comprehensive portfolios of SPST and SPDT automotive relays in the industry. Our parametric filters help refine your search results by Contact Arrangement, Contact Current, Coil Voltage and Termination Style. We offer a huge selection of Latching and Non Latching automotive relays in SPST, SPDT and DPDT combinations, with Coil Voltages from 5V to 120V (12V relays and 24V DC relays being the most common). The most common sizes for maximum contact current are 20 A and 30 A. We also carry automotive relays with maximum contact current as high as 300 A.
Automotive Relays from Binder Electric.

Binder Electric has a full selection of automotive relays from several manufacturers when looking for a relay in SPDT, SPST or DPDT combinations, PCB relays, a non latching automotive relay, a quick connect auto Relay, or for any circuit that might require an automotive relay. Simply choose from the automotive relay technical attributes below and your search results will quickly be narrowed to match your specific automotive relay application needs.

Automotive relays are found in several automobile applications including:
Car antennas
Power windows
Power seats
Car stereos
Door locks
Power sunroofs
Interior lighting
Intermittent wipers
Automotive Relay termination style is usually plug-in or quick-connect, and Binder Electric has a full selection of both versions, as well a wide choice of PCB mount automotive relays. Simply choose from the automotive relay technical attributes below and your search results will quickly be narrowed to match your specific automotive relay application needs.

Is the setting distance in the proximity switch the same as the detection distance?

Question: is the setting distance in the proximity switch the same as the detection distance? What’s the difference?
Answer: Hello, close to the switch of these 2 distance is often confused, in fact, is different. Setting distance refers to the working distance of 0.8 times times, in this distance the sensor work should not be affected by the temperature and voltage fluctuations in the wrong action. The spacing between the proximity switches and the detector must be controlled within this value during installation. The detection distance refers to the rated action distance, which is the standard value of the approaching sensor action distance measured by the standard test body. is the sensor brand calibration value.

mark sensor

Interface series relay

BRG2RV Interface Series

Cross Reference

Binder 6.2mm interface relays provide a compact solution for general purpose relay requirements. The BRG2RV series Interface relays are ideal for PLC and electronic systems, industrial automation, panel builders, assembly machine applications and other applications that require a high switching capability in a compact space.

The BRG2RV relays can be used as a universal interfaces between the controller and the actuator to switch small and medium size loads. Installation time is greatly reduced with pre-assembled relays and sockets. Replacement relays and sockets are also available.

Optional accessories include jumpers, spacers and marking plates to facilitate wiring and quick identifications.

If you are looking for Binder BRG2rv Series General Purpose Relays, please call us on (86) 577-62710579 or email us [email protected] we will do our best to help you find the relay that you are looking for at the most competitive prices possible. If you are searching forBinder relay technical information (data-sheets) please use the datasheets or product selection guide page links.


interface relay and socket






Key Features:
•Space-saving 6.2mm width
•Only 70mm in height from DIN rail
•Gold-plated contacts
•Pre-assembled relay and DIN mount socket
•Universal screw terminals
•Universal AC/DC socket with built-in surge suppression and green LED
•Lever for easy locking and removal of relay
•Wide input voltage range: 6 to 240V
•High dielectric strength and impulse withstand voltages
•Reverse Polarity protected
•400V AC maximum switching voltage
•Spring clamp accepts 20-14 AWG solid or stranded wires
•1500VA maximum switching power
•RoHS compliant

Jumper combs come with 20 points, if shorter lengths are needed simply cut off the excess points.

Note: When using a cut jumper, please use a spacer on the cut side.

Air switch principle describes the role of air switch which

Air switch principle describes the role of air switch which
Air switch principle
Tripping method has three kinds of thermal, electromagnetic and double tripping.
When the line occurs when the general overload, the overload current can not make the electromagnetic release device action, but can make the heat element to produce a certain amount of heat, so that bimetal heating up bending, pushing the lever to hook and lock off, the main touch Head off, cut off the power. When the line short circuit or serious overload current, the short circuit current exceeds the instantaneous tripping set current value, the electromagnetic release device to produce a large enough suction, the armature suction and impact the lever, so that the hook around the shaft seat up and lock off , The lock in the role of the reaction under the spring will be three main contact breaking, cut off the power.
The tripping mechanism of the switch is a set of connecting rods. When the main contact is closed by the operating mechanism, it is locked in the closed position. If a fault occurs in the circuit, the associated release will act to release the latch in the trip mechanism so that the main contact is quickly broken off by the release spring. In accordance with the different protection, the release can be divided into over-current release and voltage relief and other types.

Siemens breaker

Siemens breaker

The role of air switch
The air switch is a very important electrical appliance in the low-voltage distribution network and the electric drive system, which combines control and a variety of protection functions. In addition to complete contact and breaking circuit, but still on the circuit or electrical equipment, short circuit. Severe overload and undervoltage protection, but also can be used to start the motor less frequently.
Under normal circumstances, the overcurrent release of the armature is released; in the event of a serious overload or short circuit failure, the main circuit in series with the coil will have a strong electromagnetic attraction to attract the armature down and open the hook, Disconnect the main contact. Undervoltage release work on the contrary, in the normal voltage, the electromagnetic suction suction armature, the main contact was able to close. Once the voltage has dropped or is de-energized, the armature is released and the main contact is disconnected. When the power supply voltage back to normal, you must re-closing before work, to achieve a loss of pressure protection.
Because there are many ways of insulation, there are switches for oil switches, vacuum switches and other inert gases (sulfur hexafluoride gas). The air switch uses the air to extinguish the arc generated during the switch. So called air switch.

Latching relay Latching relay principle Latching relay works principle

Latching relay principle
Action principle: Latching relay its contact opening and closing state is usually by the permanent magnet generated by the magnetic force to maintain. When the relay contacts need to open or the state, only need to use positive (anti) DC pulse voltage excitation coil, the relay in an instant to complete the open and the state transition. Usually the contact is in the holding state, the coil does not need to continue to power, only the magnetic force of the permanent magnet can maintain the state of the relay unchanged.

Latching power relay

Latching relay 80A

Latching relay works principle

Action process: When the relay contacts need to be set, only need to use the positive DC pulse voltage excitation coil J2, coil J2 excitation after the magnetic pole and permanent magnet magnetic pole interaction, with the polarity of mutual repulsion, , So that the relay in an instant to complete the reset to set the state transition. Figure 1-4 shows the specific state transition process. The process of converting the latching relay from the set state to the reset state is the same.


Electromagnetic relay – Application analysis of electromagnetic relays

Electromagnetic relay – Application analysis of electromagnetic relays

Electromagnetic relays can use low voltage, weak current control high voltage, high current circuit, but also to achieve long-distance operation and production automation, in modern life plays an increasingly important role. So what is the electromagnetic relay that is composed of those parts? How does it achieve automatic control?

my                                    MY2

(1)the construction of electromagnetic relays
Electromagnetic relay construction: As shown, A is the electromagnet, B is the armature, C is the spring, D is the movable contact, E is the static contact. Electromagnetic relay working circuit can be divided into low-voltage control circuit and high-voltage working circuit. The control circuit is composed of electromagnet A, armature B, low voltage power supply E1 and switch. The working circuit is composed of small bulb L, power supply E2 and static contact and movable contact corresponding to switch. Connected to the working circuit, in normal, D, E is not connected, the working circuit is disconnected. With the fingers to move the contact down, then D, E between the moving contact with the static contact and the working circuit connected to a small light bulb L light. Close the switch S, the armature is sucked down by the electromagnet, moving contact with two static contact at the same time, so that D, E connectivity. At this time the spring is elongated, observe the working circuit is connected, small light bulb L light. Disconnect switch S, electromagnet loss of magnetism, no attractive to the armature. The armature in the spring under the action of the force back to the original position, moving contact and static contact separately, the working circuit is cut off, small light bulb L does not light.

electronic relay

(2)the working principle of electromagnetic relays
How it works: When the electromagnet is energized, pull the armature down to make D and E contact, and the working circuit is closed. Electromagnet power loss when the magnetic loss, the spring pull the armature, cut off the working circuit.
Conclusion: Electromagnetic relay is the use of electromagnets to control the working circuit on and off the switch.
Advantages of using electromagnetic relays to control circuits: control of high voltage with low voltage; remote control; automatic control.

(3) the application of electromagnetic relays
Anti-alarm alarm: K is the contact switch, B is a funnel-shaped bamboo cylinder, which has a float A, the water level rose more than the warning line, the float A rise, so that the control circuit connected, Then the alarm indicator circuit is connected, the light alarm.

relayTemperature automatic alarm: When the temperature rises to a certain value, the mercury thermometer in the mercury surface rose to the wire, the mercury is the conductor. So the solenoid circuit connected to the solenoid to attract the spring, so that the bell circuit closed, alarm bell alarm, when the temperature drops, the mercury surface to leave the wire, the solenoid circuit is broken, the spring back to the original, The bell is no longer sounded.



Note on sealed relays

Note on sealed relays


The relay has a sealed seal such as a plastic seal. These models not only have excellent environmental resistance, for automatic welding and cleaning and other printed circuit board when the failure to deal with the effect is also very effective. The following will describe the characteristics of sealed relays and the use of precautions, please use the discussion to avoid failure.

1. About the use of the environment Plastic seal type is not suitable for the environment with special air tightness requirements, the use of the usual flat no problem, but please avoid (96 ± 10kPa) outside the use of pressure. And to avoid the use of flammable, explosive atmospheres. In this case, use a metal reed relay.

2. About cleaning After cleaning the printed circuit board, it is recommended to use alcohol for cleaning. Please avoid ultrasonic cleaning. If ultrasonic cleaning is used, ultrasonic energy may cause slight disconnection of the coil and the contact.


Switching power supply, as the heart of electronic equipment, has a very important role in the safe and reliable operation of electronic equipment. So the switching power supply should be choose in the system development phase of electronic equipment, and not in final design stage of the whole system, which otherwise tend to delay system development time and increases system cost.

The main issues to be considered when selecting Switching Power Supply:
According to use case, setting the required output voltage and current; choosing power supply size, installation method and mounting holes, how many outputs, each output whether need to electrical isolation; input voltage range; decided the derating degree and power supply of switch power according to the ambient temperature, certification and safety standards are needed or not; the cooling method of power: natural cooling or forced air cooling; electromagnetic compatibility standards.

In order to improve the reliability of the system, the proposed switching power supply work in the 50%-80% load is better, that is, if the power is 20W, the switching power supply should be selected for the 25W-40W output power.

In order to improve the reliability of the system, the proposed switching power supply work in the 50%-80% load is better, that is, if the power is 20W, the switching power supply should be selected for the 25W-40W output power.

Clear the input voltage range, AC input, for example, commonly used in the input voltage specifications have 220V, 110V, so the corresponding 220V, 110V AC switching, as well as universal input voltage (AC:85V-264V) three kinds of specifications. Input voltage specifications should be selected based on the use of the area.

Switching power supply will consume a part of power in the work and release heat, so the user should consider the heat dissipation of the switch power supply in the system design (especially the closed system).

And there are some special cases, such as: output with a motor, printer, lighting, large relay negative impact load, transient current greatly, it is best to provide a maximum load current so that we can make special design; the system used in lightning sensitive location like lightning prone areas, or in the mountain , the design should be with the lightning protection system, and also it is best to choose the switch power supply with lightning protection function to keep the safe operation of the equipment support system.

power supply

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