PFSM.030.2 Circuit Protection

Resistance - Initial (Ri) (Min):	900 mOhms
Approvals:	cURus, TUV
Lead Spacing:	--
Thickness (Max):	0.125" (3.18mm)
Height - Seated (Max):	--
Size / Dimension:	0.289" L x 0.214" W (7.36mm x 5.44mm)
Package / Case:	2-SMD
Mounting Type:	Surface Mount
Ratings:	AEC-Q200
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	4.8 Ohms
Series:	PFSM
Time to Trip:	3s
Current - Trip (It):	600mA
Current - Hold (Ih) (Max):	300mA
Current - Max:	40A
Voltage - Max:	60V
Type:	Polymeric
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction to PFSM.030.2 Resettable Fuses

PFSM.030.2 resettable fuses are designed to protect crucial components in electrical or electronic circuits from damage due to excessive current or temperature, while allowing passed current to flow uninterruptedly through the protected circuit. Developed by the Miller Electric Company, the PFSM.030.2 fuses were designed to be an upgrade from the conventional fuses to provide improved protection in applications that require a higher level of reliability and safety.

Features of the PFSM.030.2 Fuse

The PFSM.030.2 is a unique fuse that offers a number of features which are not found in conventional fuses. These features include:

• It is a polymeric positive temperature coefficient (PPTC) device, which is also known as a thermistor. PPTC fuses are designed to be self-resetting, meaning that the fuse will return to its normal operating condition without the need to replace it when the circuit has cooled down.
• It has a single-pole, manual reset configuration with an internal over-temperature protection circuit.
• It has a current rating of 30 amps and a voltage rating of 250 volts.
• The fuse can be used in dual supply mode to provide maximum protection.
• The PFSM.030.2 fuse is very reliable and provides superior protection than conventional devices. In addition to this, the fuse also has a low hold current, which reduces the chances of any danger to the protected circuit.

Applications and Working Principle of the PFSM.030.2 Fuse

The PFSM.030.2 is suitable for a wide range of applications, including:

• Overload and short circuit protection for power supplies, audio/visual equipment and medical equipment.
• Protection for external and internal electrical circuits.
• Protection for critical control circuits.

The fuse’s working principle is based on the semiconductor nature of certain polymers, which are sensitive to changes in temperature. When the current passing through the protected circuit exceeds the current rating of the fuse, the heat generated by the excessive current causes the polymer to expand, which then releases the internal spring-loaded contact. This interrupts the flow of excessive current and prevents it from reaching the protected device, while allowing the normal current to continue flowing uninterrupted. When the circuit has cooled down, the internal contact will be reset to close and the fuse will reset itself. The protective effect of the PFSM.030.2 resets and remains active even after several thermal cycles. The fuse also has an over-temperature protection circuit which is designed to prevent the fuse from reaching high temperature and subsequently prevent it from being damaged.

Conclusion

The PFSM.030.2 resettable fuses are an ideal choice for critical applications that require superior protection and reliability. The fuse provides an effective and cost-savings solution for protecting sensitive electronic devices, while also providing over-temperature protection to ensure the fuse is not damaged. The fuse is easy to install and can be used in dual supply mode for maximum protection.

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