relco electrical components Germany relco model relco price

relco electrical components are devices for detachable (active) connection between optical fibers. They precisely align the end faces of two optical fibers to maximize the coupling of light energy from the transmitting fiber into the receiving fiber, while minimizing the impact on the system due to their insertion in the optical link. This is the basic requirement for fiber optic connectors. To a certain extent, fiber optic connectors affect the reliability and various performance metrics of optical transmission systems.

relco electrical components principle

The thermistor will remain in a non-operating state for a long period; 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 operate. When the ambient temperature is the same, the operating time of the thermistor decreases sharply as the current increases; at relatively higher ambient temperatures, the thermistor has a shorter operating time and lower holding current and operating current. The PTC effect refers to a material exhibiting the PTC effect, i.e., the Positive Temperature Coefficient (PTC) effect, which means that the 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 temperature, known as the linear PTC effect. Non-linear PTC effect: Materials undergoing phase transition exhibit a phenomenon where resistance increases abruptly by several to more than ten orders of magnitude within a narrow temperature range, known as the non-linear 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 self-resetting fuses (hereinafter referred to as thermistors). Due to their unique positive temperature coefficient resistance characteristics, they are highly suitable as overcurrent protection devices. Thermistors are used in series in circuits, similar to conventional fuses. When the circuit operates normally, the thermistor temperature is close to room temperature, and its resistance is very low, so it does not hinder 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 (ts), the resistance increases dramatically, rapidly reducing the current in the circuit to a safe value. After the thermistor operates, the current in the circuit drops significantly; t is the operating time of the thermistor. Due to the good designability of polymer PTC thermistors, their sensitivity to temperature can be adjusted by changing their switching temperature (ts), allowing them to provide both over-temperature and overcurrent protection. They are suitable for overcurrent and over-temperature protection of lithium-ion and nickel-metal hydride batteries. Influence of ambient temperature on polymer PTC thermistors: Polymer PTC thermistors are direct-heated, step-type thermistors. Their resistance change process is related to their own heat generation and dissipation conditions; therefore, their holding current, operating current, and operating time are influenced by ambient temperature.

relco electrical components characteristics

Sensitivity refers to the ratio of the change in output to the change in input of a sensor under steady-state operating conditions. It is the slope of the output-input characteristic curve. If there is a linear relationship between the sensor's output and input, then the sensitivity S is a constant. Otherwise, it will vary with changes in the input. The dimension of sensitivity is the ratio of the dimensions of the output and input quantities. When the dimensions of the sensor's output and input quantities are the same, sensitivity can be understood as the amplification factor. Increasing sensitivity can yield higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range, and often the poorer the stability.

relco electrical components parameters

(1) Rated operating voltage: Refers to the voltage required by the coil for the relay to operate normally. Depending on the relay model, it can be AC voltage or DC voltage. (2) DC resistance: Refers to the DC resistance of the relay coil, which can be measured with a multimeter. (3) Pull-in current: Refers to the minimum current required for the relay to perform the pull-in action. During normal use, the applied current must be slightly greater than the pull-in current to ensure stable operation of the relay. The working voltage applied to the coil should generally not exceed the rated operating voltage; otherwise, excessive current may burn out the coil. (4) Release current: Refers to the maximum current at which the relay performs the release action. When the current in the pulled-in state decreases to a certain level, the relay returns to the de-energized released state. At this point, the current is much lower than the pull-in current. (5) Contact switching voltage and current: Refers to the voltage and current that the relay is allowed to carry. It determines the magnitude of voltage and current the relay can control. Do not exceed these values during use, as doing so can easily damage the relay contacts.

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