Fuses

025503.5M Application Field and Working Principle

Fuses are widely used in electric power appliances and electronic products to protect the circuit of electric appliance and its components from being damaged by abnormal current. In the equipment and power supply circuit protection, fuses are very important part.025503.5M (Melamine) or 025504M (white) Current Limiting Fuses are medium voltage fuse produces by Cooper Bussmann. It is designed for general purpose disruption applications to provide protection from short-circuit and overload current.It is a type of Current Sensing Fuse which can be further classified as Interrupting Rating Fuse because of its capability to operate at rated voltage but are able to interrupt higher voltages.The 025504M fuse is a field replaceable bloc type fuse designed to protect cables and equipment. The fuse can be used in Control Systems, HVAC/R, Lighting & Power Distribution, Motor Control, Photovoltaic Systems, and Transformers and Lighting Circuits. The 025504M fuse is double rise-power rated protection and designed to clip into ANSI-Standard Square and Double-DIN rail systems. Its casing is designed to prevent dust and moisture from accumulating in the internals, and also to remain cool during continued duty. The fuse comes with a built in test-lock feature, which aids in preventing accidental de-energisation of the load circuit while operating.The 025504M fuse utilizes a Positive-Temperature-Coefficient (PTC) wire element in its construction, which allows it to be used with more than one type of fuse rating, which in turn gives users flexibility in order to meet their specific application needs.The working principle behind this fuse is one of resistance. Each fuse is made up of two metal strips, one of which is an alloy containing a specific percentage of nickel and other metals, which is embedded in a compound. This alloy strip has a hotter melting point than the other strip and will heat up and expand if an excessive current passes through it. Once the alloy strip has expanded too much and contacts the other strip, the circuit will be interrupted.In conclusion, 025504M and 025503.5M are ideal current limiting fuses to provide protection from short-circuit and overload current with flexibility to meet different application needs. It is designed for general purpose disruption applications and come with features like built-in test-lock feature and preventing dust and moisture from entering the internals systems.