VDRH20X385BSE

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The VDRH 20X385BSE is a voltage dependent resistor, or vari-istor, that is commonly used in the protection of general purpose equipment from transients, such as lightning and power spikes. It is a nonlinear two-terminal device meant to provide temporary voltage protection to electrical and electronic circuits. As the name suggests, the VDRH 20X385BSE has a 20 x 385 mm footprint, with an operating range between 85 and 575V. The VDRH 20X385BSE varistor is capable of handling energy up to 0.493 Joules or surge current up to 2000 Amps.

The primary function of the VDRH 20X385BSE is to provide a range of protection against transient voltage spikes. The device\'s nonlinear electrical characteristics allow it to selectively absorb surges without damage to itself. When a surge occurs, the varistor starts to conduct. The current through the device is dependent on the amount of energy in the surge. Once the surge has passed, the device reverts to its high resistance state and will not “trip” without a surge. Because of its rapid response time, any transients that occur while the device is on are absorbed readily and quickly.

The protection level of the VDRH 20X385BSE is determined by its maximum clamping voltage and maximum surge energy. The maximum clamping voltage refers to the maximum peak voltage that can be withstood before the varistor will start to conduct. The maximum surge energy is the total energy that the varistor can handle before it will become permanently damaged. It is important to note that the maximum clamping voltage and maximum surge energy of the VDRH 20X385BSE will vary depending on the application. When installing the VDRH 20X385BSE, it is important to use the correct mounting hardware to ensure that the device is secure and that it does not move while in operation.

The VDRH 20X385BSE is typically used in applications requiring protection against transients. These include automotive applications, such as providing voltage protection to the alternator, starter motor, electronic ignition, and the vehicle\'s audio system. It is also used in power tools, home appliances, and other electrical devices. The device can also be used to protect other vulnerable circuits such as personal computers, computer routers, and surge protectors.

The working principle of the VDRH 20X385BSE is fairly simple. The two metal electrodes of the device are attached to an internal semiconductor junction. When a voltage surge is applied, the device conducts electricity by creating a short circuit between the electrodes. The amount of current that the device can handle is determined by the amount of energy in the surge, which is dissipated as heat. Once the surge is over, the device reverts to its high resistance state to provide further protection against transients.

In conclusion, the VDRH 20X385BSE is a voltage dependent resistor, or varistor, designed to provide protection from transient voltage spikes. It has a 20 x 385 mm footprint and operates within an 85 to 575V voltage range. The device works by creating a short circuit between two metal electrodes attached to an internal semiconductor junction. This causes the device to absorb energy from the surge, protecting the connected circuit. The VDRH 20X385BSE is often used in automotive applications, as well as in home appliances and other electrical and electronic devices.

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