B59850C0120A070

Resistance - 25°C (Typ):	10 Ohms
Approvals:	UR
Lead Spacing:	0.197" (5.00mm)
Thickness (Max):	--
Height - Seated (Max):	0.669" (17.00mm)
Size / Dimension:	0.532" Dia x 0.197" W (13.50mm x 5.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	0°C ~ 60°C
Series:	--
Current - Trip (It):	400mA
Current - Hold (Ih) (Max):	200mA
Current - Max:	2.2A
Voltage - Max:	265V
Type:	Ceramic
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction to PTC Resettable Fuses

PTC (positive temperature coefficient) resettable fuses are a type of electronic circuit protection component that is designed to protect circuitry from overload and short circuit conditions. Unlike traditional fuses, PTC resettable fuses are self-resetting components. They contain a special material that will increase its resistance when it becomes hot due to excessive current draw. The increased resistance will limit the current that can flow through the circuit, protecting it from overload and short circuit conditions. Once the excessive current has been corrected, the device will cool and the resistance will return to normal, allowing the circuit to function normally.

B59850C0120A070 Application Field and Working Principle

The B59850C0120A070 is a PTC resettable fuse manufactured by EPCOS. It is designed to provide overload and short circuit protection for vehicular and consumer electronic applications that require low hold current and high hold voltage. The B59850C0120A070 has a nominal current rating of 120A with a steady state operating temperature range of -40°C to +130°C and a maximum load interruption current rating of 1000A. The B59850C0120A070 works by utilizing a special material that increases resistance when the current draw exceeds the rated limit. The material is arranged in a “spiral shape” that produces a continuous, sinusoidal current-voltage curve. Thus, when the current reaches a specified limit, the resistance increases dramatically, thus limiting the amount of current that can flow through the circuit. Once the excessive current draw is corrected, the device will cool, resetting the resistance to the nominal level and allowing the circuit to operate normally.

Advantages of PTC Resettable Fuses

PTC resettable fuses provide several advantages over traditional fuses. For one, they are more reliable since they do not require regular replacement. Additionally, since they are self-resetting, they are able to provide fast and effective protection against short circuit and overload conditions. Furthermore, many PTC resettable fuses are also relatively inexpensive, meaning they can be used in a wide variety of applications that require reliable circuit protection.

Conclusion

The B59850C0120A070 is an example of a PTC resettable fuse, and is designed to provide reliable protection for vehicular and consumer electronic applications. The device works by utilizing a special material that increases resistance when the current draw exceeds the rated limit. This ability to self-reset makes PTC resettable fuses a reliable and effective choice for circuit protection, and has allowed them to become commonplace in many automotive and electronic applications.

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