37212000411

­Fuses are safety devices that protect circuits from overloading and dangerous short circuits. The 3721 series fuses are one type of such devices. It has a wide application field in many industries. The working principle of 3721 series fuses is easy to understand.

Application Field

The 3721 series fuses are widely used in industrial automation and control systems, protection of power and communications equipment, power tools and instrumentation. It has three different fuse sizes, from 10A to 300A. The fuse has low I2t characteristics, which ensure an effective protection of the connected components.

This fuse is suitable for a wide range of applications, from simple panels and components to complex industrial systems which require higher levels of protection. In addition, the fuses have a standard structure, making them easy to install. For example, the 10A fuse fits into a standard DIN rail, providing more design options for the connected components.

Working Principle

The 3721 series fuses are one type of thermal fuse. Thermal fuses use heat to protect circuits from overcurrent. The current flows through a strip of metal which is connected to a temperature sensitive element. When the current reaches a certain rate, the element heats up and triggers the fuse.

The fuse element is designed to open at a certain current level, while the other components of the fuse remain closed. This ensures that the circuit is safely disconnected from the power source. If the overload or short circuit persists, the fuse will not be able to reset itself and must be replaced.