RUSBF090-2 Circuit Protection

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PTC Resettable Fuses (Polymeric Positive Temperature Coefficient Fuses) are current-limiting electrical devices that are designed to protect against overload and short-circuit conditions in products. They are often used in automotive applications, consumer electronics, lighting, and industrial applications, and can be used as either a primary protection device or secondary protection device. The RUSBF090-2 is an electronic resettable fuse designed to protect against a wide range of overload and short-circuit current conditions. This article will discuss the application field and working principles of the RUSBF090-2.

Application Field

The RUSBF090-2 is ideal for applications where consistent protection and prolonged fuse life is required. It is ideal for applications that require low operating current, short circuit protection, and reliable, repeatable resets. Some of the common application fields of the RUSBF090-2 are consumer electronics, automotive applications, industrial motor drives, health care, communication equipment, panel displays, lighting, and any other application that requires short circuit protection and frequent resetting.

Working Principle

The RUSBF090-2 is a multi-layer Polymeric Positive Temperature Coefficient (PPTC) fuse made up of a resistance element and a temperature sensitive polymer. The resistance element is composed of trace metal particles that are suspended in a resin matrix. The metal particles increase resistance as more current is supplied, limiting the current flow when the device heats up. When the current reaches a certain limit, the temperature of the metal particles causes the polymer to expand and increase the resistance, cutting off the current. When the current is reduced to a safe level, the polymer slowly reset to its original shape, thus allowing the current to flow and the device to be reset.

The RUSBF090-2 has an operating current of 90mA and a resettable voltage of 4V. It also has a power dissipation of 1.4W and an operating temperature range of -40°C to +85°C. The device is rated for a maximum hold current of 2000mA and a maximum nominal dissipation of 10W.

The RUSBF090-2 also offers reset protection against short-circuit conditions. When a short-circuit condition occurs, the device expands quickly and cuts off the current flow. When the current flow is corrected, the device gradually returns to its original shape, resetting the device. This allows the device to be reset without power loss, providing a significant advantage over traditional fusing solutions.

The RUSBF090-2 is a reliable and durable resettable fuse ideal for a variety of applications, particularly those that require consistent and reliable protection and resetting. With its wide operating temperature range, low operating current, and short circuit protection, this device is an ideal solution for those seeking an alternative to traditional fuses. With a better understanding of its application field and working principles, designers can make an informed decision about the right device for their application.

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