Gessmann electrical components Germany Gessmann model Gessmann price

Gessmann electrical components utilize the good conductivity and fluidity of mercury to control the opening and closing of electrical circuits. They consist of a glass tube, mercury, fixed electrodes, lead wires, etc. After evacuating the air from the tube, it is filled with various gases and sealed. It is suitable for environments with dust, oil, water vapor, and corrosive gases, and can also be used as an explosion-proof switch in places with explosive gases. Given the high surface tension and specific gravity of the mercury inside the tube, along with its fluidity, the position of the mercury changes immediately upon slight tilting of the glass tube, and contacts the electrodes via surface contact, thus enabling the switching of high AC and DC currents. Additionally, this type of switch features a lifespan of several million operations at rated current, small size, high sensitivity, no mechanical noise, and low cost, so it has always been used as a switch for automatic control.

Gessmann electrical component principle

The thermistor will remain in a non-tripped state for extended periods; when the ambient temperature and current are in the c region, the heat dissipation power of the thermistor is close to its heat generation power, so it may or may not trip. For a given ambient temperature, the tripping time of the thermistor decreases sharply as the current increases; at relatively higher ambient temperatures, the thermistor has a shorter tripping time and lower holding current and tripping current. The PTC effect refers to a material exhibiting the PTC effect, i.e., the positive temperature coefficient effect, meaning that the electrical resistance of the material increases with rising temperature. For example, most metallic materials exhibit the PTC effect. In these materials, the PTC effect manifests as a linear increase in resistance with increasing temperature, which is commonly referred to as the linear PTC effect. Nonlinear PTC effect: Materials undergoing a phase transition exhibit a phenomenon where resistance increases sharply by several to more than ten orders of magnitude within a narrow temperature range, known as the nonlinear PTC effect. Many types of conductive polymers exhibit this effect, such as polymer PTC thermistors. These conductive polymers are very useful for manufacturing overcurrent protection devices. Polymer PTC thermistors are used for overcurrent protection and are often referred to as resettable fuses (hereinafter referred to as thermistors). Due to their unique positive temperature coefficient resistance characteristics, they are highly suitable for use as overcurrent protection devices. The method of using a thermistor is similar to that of a conventional fuse; it is connected in series in the circuit. When the circuit operates normally, the thermistor's temperature is close to room temperature and its resistance is very low, so connecting it in series does not hinder current flow. However, when an overcurrent occurs due to a fault, the increased heat generation causes the thermistor's temperature to rise. When the temperature exceeds the switching temperature, the resistance increases dramatically, rapidly reducing the current in the circuit to a safe value. After the thermistor trips, the current in the circuit is significantly reduced; t is the tripping time of the thermistor. Due to the good design flexibility of polymer PTC thermistors, their temperature sensitivity can be adjusted by changing their switching temperature (ts), allowing them to provide both overtemperature and overcurrent protection. They are suitable for overcurrent and overtemperature protection of lithium-ion and nickel-metal hydride batteries. Influence of ambient temperature on polymer PTC thermistors: A polymer PTC thermistor is a direct-heating, step-type thermistor. Its resistance change process is related to its own heat generation and dissipation conditions; therefore, its holding current, tripping current, and tripping time are influenced by ambient temperature.

Gessmann electrical component principle

An AC power supply that can provide stable voltage and frequency is called an AC stabilized power supply. Most domestic manufacturers focus on AC voltage stabilization. Below is a brief description of the classification characteristics combined with existing AC stabilized power supplies on the market. Parameter adjustment (resonance) type: The basic principle of voltage stabilization for this type of stabilized power supply is LC series resonance. Early magnetic saturation stabilizers belong to this category. Its advantages are: simple structure, few components, high reliability, wide voltage stabilization range, strong anti-interference and overload capacity. Disadvantages are: high energy consumption, high noise, heavy weight, and high cost.

Gessmann electrical component characteristics

The main parameters characterizing resistor characteristics include nominal resistance and its tolerance, rated power, load characteristics, and resistance temperature coefficient. Load characteristics: When the working environment temperature is below tR, the resistor must not exceed its rated power; when exceeding tR, the load power must be reduced. Each type of resistor has specified load characteristics. In addition, the allowable load can be correspondingly reduced under low pressure. Under pulse load, the average pulse power is far lower than the rated power, and there are generally separate regulations. Within the specified ambient temperature range, the average relative change in resistance value for every 3℃ change in temperature is expressed in ppm/℃. In addition to the above parameters, there are other technical indicators such as non-linearity (degree of deviation of the current-voltage characteristic from a linear relationship), voltage coefficient (relative change rate of resistance per volt change in applied voltage), current noise (ratio of the effective value of noise potential generated by current flow within the resistor body to the test voltage, expressed by the current noise index), high-frequency characteristics (curve showing the decrease in resistance with increasing operating frequency due to the influence of distributed capacitance and inductance within the resistor body), and long-term stability (process of irreversible change in resistance value due to environmental conditions during long-term use or storage).

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