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Temperature fuses, also known as thermal fuses or thermal melt fuses, are safety devices used to protect circuits or equipment. They are specially designed resistance wires that can automatically disconnect the circuit based on the magnitude of the current and the duration of time, serving the purpose of overload protection.

2023

08-12

The working principle of temperature fuses

When current flows through a conductor, the conductor will heat up due to its certain resistance. The amount of heat generated follows this formula: Q=0.24I2RT; where Q is the amount of heat generated, 0.24 is a constant, I is the current flowing through the conductor, R is the resistance of the conductor, and T is the time the current flows through the conductor; from this formula, we can easily see the simple working principle of a fuse.

2023

03-11

What is used to sense temperature in a temperature control switch?

Many friends are very interested in what temperature sensing the snap-action temperature control switch relies on! Since it is a snap-action temperature control switch, it must have its own temperature sensing system. Without a good temperature sensing system, it is impossible to predict the temperature.

2020

07-15

Longde Electric teaches you how to use the thermostat correctly.

The use of electric heating systems in homes is increasing, and how to save energy has become a concern for many people. In addition to ensuring good insulation in the house, temperature control is one of the keys to energy saving. Some users who have installed electric heating always turn on the thermostat when needed and turn it off when they go out, thinking that this will save electricity. In fact, this not only does not save energy but also consumes more energy. So how can we use the thermostat to truly save energy? Let's learn from the editor of Longde Electric.    1. Is turning it on when needed energy-saving?   Turning on the thermostat when needed and turning it off when going out will consume energy. The electric heating system operates at low temperatures and has good heat storage capabilities. After the system is turned on, it takes some time for the room temperature to reach the set temperature, and when the system is turned off, the indoor temperature does not drop rapidly. When turned back on, it also takes a long time to raise the temperature again. Frequent switching not only does not achieve energy-saving effects but also increases the operating costs of the heating system.     Rooms that are not frequently used can have their temperature lowered a few degrees through the thermostat. When leaving the house for a long time, simply lower the thermostat temperature a few degrees. In cases where the house is unoccupied for a long time or when leaving for an extended period, the system can be turned off. However, it is important to note that if there are devices in the room that are at risk of freezing, the temperature should be maintained at a certain level to prevent damage to the equipment or pipes.   2. Does setting the thermostat to a high temperature heat up quickly?   Some users feel that the room temperature is low and set the thermostat to a higher temperature to heat up quickly, which is also incorrect. The time it takes for the room temperature to rise depends on the temperature difference between indoors and outdoors, as well as the installed power per unit area of the room. With a constant installed power and temperature difference, regardless of how high the setting is, the time it takes for the room to reach the desired temperature remains the same. If the room is currently at 16 degrees and you want to raise it to 18 degrees, setting the thermostat to 18, 20, or 25 degrees will take the same amount of time to reach 18 degrees.   Set the thermostat to the desired temperature, or use a smart thermostat that can automatically calculate the pre-heating time.

2020

07-15

What types of fuses do you know?

There are many types of fuses, classified by protection form, usage range, size, rated voltage, breaking capacity, melting speed, etc. Below is an introduction based on type classification, which can be divided into: current fuses: chip fuses, micro fuses, plug fuses, tubular fuses; temperature fuses: RH square type, RP resistance type, RY metal shell; self-resetting fuses: plug-in, stacked, chip.   1. Current Fuses. 1. Chip Fuses. Available in specifications such as 0805, 1206, using thin film technology to control electrical characteristics. Due to their small size, they are ideal for providing secondary protection in circuits with limited space, such as handheld portable electronic devices and various instruments. 2. Tubular Fuses. These are very common, especially in various power applications such as switch power supplies. 3. Plug Fuses. Commonly seen in automotive applications, sometimes also called fork fuses. 4. Micro Fuses.   2. Temperature Fuses.  Temperature fuses, also known as thermal fuses (National Standard GB9816.1-2013), are temperature sensing circuit interruption devices. Temperature fuses can sense overheating caused by abnormal operation of electrical and electronic products, thereby cutting off the circuit to prevent fire hazards. They are a type of non-recoverable disposable thermal protection device, with series such as RH, RF, RY, featuring a compact appearance, good sealing, sensitive and reliable action temperature, minimal impact from current surges, and resistance to vibration. They are mainly used in electric fans, rice cookers, electric frying pans, sterilizers, etc.   1. RH Square Temperature Fuse. The appearance is a plastic square shell, square temperature fuse, generally made of low melting point alloy. 2. RY Metal Shell Temperature Fuse. Made with a metal shell and organic chemical substances as the thermal sensing element, it is sensitive, accurate in action, with a sealed structure and reliable performance. Used in rice cookers, hair dryers, motors, etc. 3. RP Resistance Type Temperature Fuse, generally made of low melting point alloy.     3. Self-Resetting Fuses. This is a type of fuse that automatically resets when the circuit is open due to excessive current, belonging to the reusable type, suitable for overload protection circuits. 1. Plug-in Self-Resetting Fuse. 2. Chip Self-Resetting Fuse. 3. Stacked Self-Resetting Fuse.

2020

07-15

Key points for selecting fuses

When choosing a fuse, I believe everyone finds it quite troublesome, as there is no good guidance. Below, the editor from Longde Electric will list the factors involved in fuse selection, so that everyone can choose a suitable fuse based on these ideas.

2020

07-15

Why can't a fuse be replaced with copper wire?

Although a fuse is also a type of metal wire, it is different from ordinary copper or iron wire. It is soft and is made from low melting point alloys such as lead, antimony, or lead and tin. Its resistivity is relatively high, and its melting point is relatively low, making it inherently heat-sensitive. Due to the thermal effect of electric current, as long as the current passing through the fuse exceeds its rated current and reaches the melting current, the fuse will quickly melt, automatically disconnecting the circuit and power supply. This way, strong current cannot enter the user's home, thus preventing instruments, appliances, or wires connected to the circuit from being damaged due to excessive current. When a fuse blows, it cannot be casually replaced with copper or iron wire. If copper or iron wire is used to replace the fuse, due to their high melting points, they will not melt even when strong current passes through, failing to achieve the purpose of automatically cutting off the current, which is very dangerous. Additionally, when installing a fuse, it is essential to choose one of the appropriate thickness. There are many specifications for fuses, usually indicated by their rated current. For fuses made of the same material, the larger the cross-sectional diameter, the greater the rated current that can pass through. Therefore, when selecting, it is necessary to first calculate the maximum working current through the circuit based on the total wattage of the appliances, ensuring that the rated current of the fuse is equal to or slightly greater than the maximum working current of the circuit. This ensures that the fuse can operate normally and can quickly melt and cut off the circuit when encountering excessive current. If the rated current of the fuse is too high, it will not melt when there is excessive current in the circuit, failing to provide protection, which is no different from using steel or iron wire; if the rated current is too low, the fuse will also melt under normal electrical conditions, causing a power outage.

2020

07-30

Longde Science Popularization: The Role of Temperature Fuses in Circuits

2020

07-30

How to use a thermostat to truly achieve energy savings

Under the national clean heating initiative of "coal to electricity," more and more households are using electric heating, and how to save energy has become a concern for many people. In addition to ensuring good insulation of the house, temperature control is one of the keys to energy saving. Some users who have installed electric heating always turn on the thermostat when needed and turn it off when they go out, thinking this will save electricity. In fact, this not only does not save energy but also consumes more energy. So how can we use the thermostat to truly achieve energy savings?     Misconception 1. Can turning it on and off save energy?   Turning on the thermostat when needed and turning it off when going out will consume energy. The electric heating system operates at low temperatures and has good heat retention. After the system is turned on, it takes some time for the room temperature to reach the set temperature, and the indoor temperature does not drop rapidly after the system is turned off. When turned back on, it also takes a long time to raise the temperature again. Frequent switching not only fails to achieve energy savings but also increases the operating costs of the heating system.   Correct usage method:     For rooms that are not frequently used, the temperature can be lowered a few degrees using the thermostat. When leaving the house for a long time, simply lower the thermostat temperature a few degrees. In cases of long-term unoccupancy or extended absence, the system can be turned off, but it is important to note that if there are devices in the room that are at risk of freezing, the temperature should be maintained at a certain level to prevent damage to the equipment or pipes.       Misconception 2. Does setting the thermostat to a higher temperature heat up faster?     Some users feel that the room temperature is low and need to heat up quickly, so they set the thermostat to a higher temperature, which is also incorrect.     The time it takes for the room temperature to rise depends on the temperature difference between indoors and outdoors, as well as the installed power per unit area of the room. With a constant installed power and temperature difference, regardless of how high the setting is, the time it takes for the room to reach the desired temperature is the same.     If the room is currently at 16 degrees and you want to raise it to 18 degrees, in this case, setting the room temperature to 18, 20, or 25 degrees will take the same amount of time to reach 18 degrees.   Correct usage method:       Set the thermostat to the desired temperature, or use a smart thermostat that can automatically calculate the preheating time.

2020

07-30

A Brief Discussion on the Function of Temperature Fuses

The temperature fuse, also known as a thermal fuse, is a new type of electrical overheating protection component. This component is usually installed in appliances that are prone to heating. Once the appliance malfunctions and generates heat, when the temperature exceeds the abnormal temperature, the temperature fuse will automatically melt, cutting off the power supply to prevent the appliance from causing a fire. In recent years, in our country, most household appliances that primarily function by generating heat, such as rice cookers, electric kettles, and electric stoves, have been equipped with temperature fuses. When the internal components fail, the temperature fuse can timely cut off the power supply, preventing further damage to the appliance and eliminating the risk of fire caused by it. The temperature fuse functions similarly to the fuses we are familiar with; it usually acts as a power path in the circuit. If the rated value is not exceeded during use, it will not melt and will not affect the circuit. It only melts and cuts off the power circuit when the appliance malfunctions and generates an abnormal temperature. This is different from a fuse, which melts due to the heat generated when the current in the circuit exceeds the rated current.      The temperature fuse has characteristics such as accurate melting temperature, high voltage resistance, small size, and low cost. The rated temperature value and rated current value are marked on the shell of the temperature fuse, making identification easy and use very convenient. It can be widely used in electrical equipment, electric heating devices, and practical appliances for overheating protection. The temperature fuse mainly has the following parameters:     1. Rated temperature: Sometimes also referred to as operating temperature or melting temperature, it refers to the temperature reached when the temperature rises at a rate of 1°C per minute under no load until it melts. 2. Melting accuracy: Refers to the difference between the actual melting temperature of the temperature fuse and the rated temperature. 3. Rated current and rated voltage: Generally, the current and voltage rated for temperature fuses have a certain margin, usually 5A and 250V.   The temperature fuse is a one-time use protection component. Its effectiveness not only depends on the performance of the component itself but also on how to correctly select and install the temperature fuse. When using a temperature fuse, it is generally connected in series in the circuit, so when selecting a temperature fuse, its rated current value must be greater than the current used in the circuit, and the current passing through the temperature fuse must never exceed the specified rated current value. Before selecting the rated temperature of the temperature fuse, it is necessary to understand and actually measure the temperature that needs protection and the temperature difference at the installation position of the temperature fuse. In addition, the duration of the melting time and whether ventilation is possible are also closely related to the selection of the rated temperature of the temperature fuse.

2020

07-30

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