B59315P1120A062 Circuit Protection

Resistance - 25°C (Typ):	16 Ohms
Approvals:	--
Lead Spacing:	--
Thickness (Max):	0.150" (3.80mm)
Height - Seated (Max):	--
Size / Dimension:	0.394" L x 0.315" W (10.00mm x 8.00mm)
Package / Case:	4032 (1080 Metric)
Mounting Type:	Surface Mount
Ratings:	AEC-Q200
Operating Temperature:	-40°C ~ 60°C
Series:	--
Current - Trip (It):	310mA
Current - Hold (Ih) (Max):	150mA
Current - Max:	1.6A
Voltage - Max:	80V
Type:	Ceramic
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

PTC Resettable Fuses, also known as "Polyfuse," are a type of circuit protection device which features a self-resetting functionality. Traditional fuses are designed to be permanently damaged when a short circuit or overload occurs. PTC fuse breakers, meanwhile, detect and trip whenever a short circuit occurs, and then they automatically reset when the fault current is removed. This makes them suitable for applications which require a reset once the fault is cleared. The B59315P1120A062 is a particular type of PTC Resettable Fuse that is widely used in electrical circuits.

Application Field and Principle

The B59315P1120A062 can be used in applications with a maximum 10A current. It has a fast response time on short-circuit events and is therefore ideal for circuit protection where a fast response is needed. The B59315P1120A062 also has a very low resistance at normal operating conditions, making it ideal for applications involving high-power circuits. In terms of its working principle, the B59315P1120A062 consists of a positive temperature coefficient of resistance (PTCR). The fuse is heated by the current that passes through it. When an overload or short circuit occurs, the increased current and hence heat level raises the temperature of the PTCR to the point where it "trips," and the current is cut off. Once the fault is removed, the PTCR cools down and automatically resets, enabling the circuit to operate normally again.

Advantages and Disadvantages

The main advantage of the B59315P1120A062 is that its self-resetting design provides a fast response to short-circuit events while still protecting the circuit as needed. The user can simply reset the fuse instead of having to replace it. On the other hand, the disadvantage of the B59315P1120A062 is that the resetting process can degrade the fuse’s ability to hold current over multiple resets, thereby reduce its lifetime.

Conclusion

The B59315P1120A062 is a particular type of PTC Resettable Fuse which is well-suited for applications with current up to 10A. This fuse operates on the principle of using a PTCR to detect a fault and trip the circuit. Furthermore, its self-resetting design provides a fast response to short-circuit events, yet is prone to degradation after multiple resets. As such, the B59315P1120A062 provides a great choice for applications which require quick response and protection in the event of a fault.

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