PTM902-020K-503B1

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Rotary Potentiometers, Rheostats are electric devices commonly used in electronic circuits for various purposes, such as voltage or current control, sensing, and signal attenuation. One particular example of these devices is the PTM902-020K-503B1; this device is a three-terminal (A, B, and W) panel-mount multiposition adjustable carbon rheostat with a maximum resistance of 20 kilohms, a maximum current rating of 1 A, and 20 separate positions between terminals A and B. This particular device is relatively small, measuring 0.118 in. (2.99 mm) in diameter and 0.236 in. (6 mm) in length, and is made from several materials including steel, aluminum, phenolic plastic, and carbon. In this article, we will discuss the application field and working principle of the PTM902-020K-503B1.

Applications

The PTM902-020K-503B1 is most commonly seen in applications that require precise resistive control, such as audio and volume control systems, signal attenuation and transducer control. This device is particularly effective in applications dealing with temperature control systems, radios and televisions, audio amplifiers, and many other consumer electronic devices. This device is also very useful in industrial applications such as testing of circuit breakers, meters and gauges, electronic ballasts, and other AC and DC loads. This device is also very popular in motors and power transmission systems for controlling current, voltage, and speed.

Working Principle

The PTM902-020K-503B1 works by adjusting the amount of electrical resistance between terminals A and B within a specified range. The resistance level between A and B is determined by the amount of voltage applied to terminal W, which is typically referred to as the “sensing” terminal. As the voltage on terminal W is increased or decreased, the resistance between A and B also changes accordingly. This, in turn, changes the amount of current flowing through the device, allowing for precise control of a circuit.

In addition to these features, the PTM902-020K-503B1 also has a feature known as “thermal shutdown” which protects the device from thermal damage by automatically shutting down the power supply if the temperature at the sensing terminal exceeds a certain limit. This ensures that the device always operates within safe parameters and does not cause any damage to the circuit.

Conclusion

In conclusion, the PTM902-020K-503B1 is a reliable, precise, and effective 3-terminal Carbon Rheostat. It is a popular choice for a variety of applications including temperature control systems, radios and televisions, audio amplifiers, motors and power transmission systems, and more. Furthermore, it has additional features such as thermal shutdown which can protect the device from thermal damage.

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