0ZRA0400FF1E

Resistance - Initial (Ri) (Min):	20 mOhms
Approvals:	cURus, TUV
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.504" (12.80mm)
Size / Dimension:	0.280" L x 0.118" W (7.10mm x 3.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	63 mOhms
Series:	0ZRA
Time to Trip:	3.5s
Current - Trip (It):	6.8A
Current - Hold (Ih) (Max):	4A
Current - Max:	100A
Voltage - Max:	16V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

PTC Resettable Fuses are used to provide overcurrent protection in electronic or electrical systems. This type of fuse is resetable after tripping and will protect against short circuits or overvoltage of regulated power supplies. The 0ZRA0400FF1E is an example of such a device, and this article will explore the application fields and working principle.

Application Fields

The 0ZRA0400FF1E, like other PTC Resettable Fuses, is used in many applications where overcurrent protection is needed. These include, but are not limited to, Networking and Telecom equipment, Computers, Servers, Network switches, and communication equipment. It can also be used in industrial machinery, HVAC systems, medical systems, automotive equipment, and consumer electronics.

Working Principle

The 0ZRA0400FF1E works by limiting the maximum amount of current that is allowed to flow through the device. The fuse is made up of two sets of cylindrical segments. The first set of segments contains a positive temperature coefficient (PTC) material, while the second set contains a negative temperature coefficient (NTC) material. When the maximum current is exceeded, the heat generated by the current will cause both sets of segments to expand. This movement causes the contact points to break, thereby interrupting the flow of current and protecting the equipment. Once current flow is below the maximum level, the contact points will re-connect and the electrical circuit will be re-established.

Conclusion

The 0ZRA0400FF1E is an example of a PTC Resettable Fuse, which is often used to provide overcurrent protection in a range of applications. This type of fuse works by limiting the maximum current that is allowed to flow through the device and breaking the circuit when the set current is exceeded. Upon cooling, the contact points will reconnect and the device can provide protection again.

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