SR-5-40MA-AP

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Fuses are a type of electrical component that are designed to protect circuits from excessive, sudden current overloads that can happen when a short circuit or other unexpected incident occurs. They typically break an electrical circuit when a predetermined current level is exceeded. The SR-5-40MA-AP fuse is a UL and CUL listed device with a voltage rating of 125-250VAC and 250VDC and is suitable for a wide range of applications. In this article, we will discuss the application field and working principle of this particular fuse.

Application Field

The SR-5-40MA-AP fuse is a dual-element, slow-blow type, meaning that it is designed to handle high inrush currents associated with capacitor charging circuits, motor starting, and other current-consuming operations. It has a wide range of applications suitable for circuit protection in household appliances, lighting fixtures, transformers, power supplies, and more.

This fuse is also approved for use in NEC Class 2 and Class 3 applications, such as in battery-powered or low-voltage circuits. Additionally, it is suitable for T2-rated systems. Its design features make it a great choice for circuit protection in a variety of applications, including HVAC, imaging systems, motors, robotics, and medical equipment.

Working Principle

A fuse consists of a metal strip or element that is surrounded by a material designed to melt when exposed to a high level of current. The SR-5-40MA-AP is a dual-element fuse, meaning it consists of two strips of metal or elements encased in a fuse body. Depending on the specific application, each of the elements in the fuse may be designed to melt at different temperatures.

When an electrical circuit is exposed to a current level that exceeds a certain amount, the metal strip heats up and the surrounding material melts. This causes the circuit to be broken, preventing further damage from occurring. In the case of the SR-5-40MA-AP, the two elements are designed such that the first one will melt at a relatively low current level, while the second one will protect the circuit against higher current overloads.

Once the power has been disconnected and the cause of the overload determined, the line can be restored by replacing the fuse. The SR-5-40MA-AP fuse can be reset once the fault has been eliminated. After resetting the fuse, the circuit can be restored and power can be applied again.

Conclusion

The SR-5-40MA-AP fuse is a dual-element, slow-blow type fuse designed to protect circuits from unexpected current overloads. It is suitable for a wide range of applications, including T2-rated and NEC Class 2 and Class 3 systems. Its dual-element design allows it to handle both low and high current overloads, and the fuse can be easily reset once the fault has been eliminated.

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