V320LS40B

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V320LS40B is a series of varistors manufactured by Littelfuse. Varistors are voltage-dependent resistors that, once their threshold is exceeded, greatly reduce the current flowing through the device. They have relatively low resistance at voltages below the threshold. Above the threshold, they conduct very well to protect components from powerful surges and spikes. V320LS40B is suitable for applications where harsh surges are present, such as power supplies, industrial control systems, automotive applications, and similar.

The metal-oxide varistor (MOV) is the most widely used type of Varistor. MOVs are made up of an oxide-rich ceramic material that includes conductive particles. They have voltage dependent resistors in them made with a low-voltage breakdown. When the voltage exceeds the threshold of the MOV, the resistance in the MOV reduces, allowing a higher current flow.

V320LS40B is a low-voltage metal-oxide varistor that provides reliable protection against damages caused by transient voltages and over-voltages. It has an AC breakdown voltage of 115 V (for 330 V or lower AC application). It features a low current noise, fast response time, and a wide operating temperature range. Additionally, its highly rugged construction prevents the device from being damaged even in the harshest environments.

V320LS40B provides an easy-to-use, low-cost solution for transient-voltage suppression and over-voltage protection applications. It can be used in environments prone to electrical surges, like ATX power supplies, consumer electronics, and peripherals. V320LS40B also meets International EMC (electromagnetic compatibility) standards.

To understand the working principle of V320LS40B, we need to first explore voltage-dependent resistors. These types of resistors are made of a ceramic material that, when exposed to voltage, exhibits a resistance that changes with the voltage. This results in the device offering a high resistance at low voltage and a low resistance at high voltage. This characteristic allows V320LS40B to offer a high degree of protection against transient voltage surges.

The surge voltages are collected and spread across the varistor when they reach the device. The voltage overload causes the MOV to conduct a high current, which dissipates the energy and reduces the voltage, resulting in the device acting as a surge protector. This mechanism offers protection for the components connected to the device.

The working principle of V320LS40B makes it a dependable solution for harsh environments where voltage surges are present. Its reliable protection prevents circuit damage, ensuring that the components remain safe from the hazards of powerful surges. It also has a low current noise and a fast response time that allow it to quickly reset once the threshold is reset by the surges.

V320LS40B is an excellent choice for applications where transient voltages and over-voltages are present, such as power supplies, industrial control systems, automotive applications, and similar. Its highly rugged construction makes it perfect for harsh environments, and its compliance with International EMC standards ensures that the device meets all safety requirements.

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