ROV10H681K-S

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TVS (transient voltage suppressor) products are electrical components that are used to protect sensitive electronics from transient overvoltages and they come in many shapes and sizes. Today, we are focusing on the ROV10H681K-S, a varistor product from Littelfuse that is commonly used in AC line protection. This article will explore the application field and working principle of this device.

The ROV10H681K-S is a bidirectional, low-capacitance, nonlinear varistor with a very high surge capability. It is ideal for use in AC line protection applications that require high power handling and fast response times. Its bidirectional capability allows it to protect against both positive and negative transient voltages, ensuring effective protection against surge events.

The ROV10H681K-S varistor is designed for use in consumer and industrial electronics, such as washing machines, refrigerators, HVAC systems, motors, power supplies, computers, drives, and other high-power electrical systems. It is also suitable for use in safety systems such as medical equipment, alarm systems, and computer-controlled industrial systems. These devices are UL 1449 recognized, complies with IEC 61051-1, UL 497A standards, and can be used as a primary source of overvoltage protection in 2-wire applications.

The ROV10H681K-S varistor has a working principle that is based on the concept of nonlinearity. When the voltage across the device is increased, its resistance increases exponentially until it reaches a saturation level. When the current increases above the saturation level, the device dispels the excess energy as heat. This causes a dramatic increase in the current flow, which dissipates the transient voltage and effectively protects the circuitry.

The ROV10H681K-S varistor has a maximum peak pulse current of 6.8KA, a surge current of 8.2KA, and a maximum voltage rating of 885VAC. It has a big temperature coefficient of -9.4V/°C, a very low capacitance of 0.2~0.3pF, excellent EMI/RFI noise reduction, and a very high surge capability. This makes it an excellent choice for AC line protection in a variety of applications.

In summary, the ROV10H681K-S varistor from Littelfuse is a highly efficient device that is designed for AC line protection in a variety of consumer and industrial electronics. It is UL 1449 recognized, has a working principle based on nonlinearity, and has very low capacitance, excellent EMI/RFI noise reduction, and a very high surge capability. This makes it an ideal AC line protection device for a wide variety of applications.

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