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, corrosive gases, and can also be used as an explosion-proof switch in places with explosive gases. Due to the high surface tension and specific gravity of the mercury inside the tube, and its rich fluidity, as long as the glass tube is slightly tilted, the position of the mercury changes immediately, and contacts the electrodes via surface contact, thus enabling the switching of high AC and DC currents. In addition, this type of switch features a service life of several million cycles at rated current, small size, high sensitivity, no mechanical noise, and low price, 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 resistance of this 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 phase transition exhibit a phenomenon where resistance increases sharply by several to more than ten orders of magnitude over a narrow temperature range, known as the nonlinear PTC effect. Many types of conductive polymers exhibit this effect, such as polymeric PTC thermistors. These conductive polymers are very useful for manufacturing overcurrent protection devices. Polymeric 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 as overcurrent protection devices. The thermistor is used in series in the circuit, similar to a conventional fuse. When the circuit operates normally, the thermistor's temperature is close to room temperature and its resistance is very low, so it does not impede current flow when connected in series. 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 circuit current 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 polymeric 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 polymeric PTC thermistors: Polymeric PTC thermistors are direct-heating, step-type thermistors. Their resistance change process is related to their own heat generation and dissipation conditions, so their holding current, tripping current, and tripping time are affected 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. The following briefly describes the classification characteristics based on existing AC stabilized power supplies in 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 operating 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 much lower than the rated power, and there are generally separate regulations. Within the specified ambient temperature range, the average relative change in resistance 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 (the process of irreversible change in resistance value due to environmental conditions during long-term use or storage).

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