FRN-R-400

Response Time:	Slow
Size / Dimension:	2.380" Dia x 8.630" L (60.45mm x 219.20mm)
Package / Case:	Cartridge, Non-Standard
Mounting Type:	Holder
Breaking Capacity @ Rated Voltage:	200kA AC, 20kA DC
Operating Temperature:	--
Approvals:	CE, CSA, UL
Class:	RK5
Features:	--
Applications:	Electrical, Industrial
Series:	Fusetron™ FRN-R
Voltage Rating - DC:	250V
Voltage Rating - AC:	250V
Current Rating:	400A
Fuse Type:	Cartridge
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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FRN-R-400 Application Field and Working Principle

Introduction:

FRN-R-400 is a type of specialty fuses that are designed for protection of the electrical circuits that are vulnerable to voltages spikes caused by lightning or switching operations. The fuse is designed as a short-circuit device that trips when the overload current exceeds a set threshold. The fuse works by cutting off the power supply to the circuit it is protecting, helping to minimize any potential damage to the system by preventing further current spikes.

Design Construction and Purpose:

FRN-R-400 fuses are composed of two parts; a metal element including a tube, and air or solid insulation around the tube. When it is in the closed state, the air insulation allows current to pass through the fused its entirety. The other part of the fuse is its rated voltage, usually up to 400VAC. This voltage limit is set to reduce the effect of a large current, or an overvoltage, that could affect the protected system. The action of the fuse is two-fold; it will recognize a large level of current in the circuit, and then it will cut off the power to the circuit. Since the fuses are designed to be sensitive to in-rush currents, supplemental protection devices such as surge arresters are typically used to protect the system from lightning and transient damage.

Working Principle:

The working principle of the FRN-R-400 fuse is based upon current passing through the fuse element. When an over current is detected in the circuit, the fuse element will heat up. This heat causes the metal element to expand, and eventually break the circuit. The purpose of this break is to protect the system from further damage. The actual cutoff current of the fuse is determined by the amperage rating written on the fuse. When the current in the circuit returns to normal levels, the fuse element will cool off and return to its original shape. This allows the circuit to be restored as normal, and the fuse can reset itself. This resetting is known as a reclosable fuse, and it allows the system to continue operating without requiring manual resetting.

Conclusion:

In conclusion, FRN-R-400 specialty fuses are designed to protect electrical systems in applications such as industrial, residential, and automotive circuits from high current levels or an overvoltage. The fuse consists of two parts; a metal element and a rated voltage, and when a high current is detected, the element will heat up and expand, breaking the circuit and tripping the system. The fuse element will then reset itself when the current returns to normal. This helps to minimize any potential damage to the system, while also allowing the system to continue operating without requiring manual resetting.

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