ASMDC300F/24-2

Series:	PolySwitch®, ASMD
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	Polymeric
Voltage - Max:	24V
Current - Max:	40A
Current - Hold (Ih) (Max):	3A
Current - Trip (It):	6A
Time to Trip:	5s
Resistance - Initial (Ri) (Min):	15 mOhms
Resistance - Post Trip (R1) (Max):	72 mOhms
Operating Temperature:	--
Ratings:	PS300, PS400
Mounting Type:	Surface Mount
Package / Case:	2-SMD
Size / Dimension:	0.295" L x 0.201" W (7.50mm x 5.10mm)
Height - Seated (Max):	--
Thickness (Max):	0.028" (0.71mm)
Lead Spacing:	--
Approvals:	--

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Introduction to PTC Resettable Fuses

PTC (positive temperature coefficient) resettable fuses (also known as polymeric positive temperature coefficient, PPTC) are thermally-activated devices primarily used in the protection of electrical circuits against currents that are either too large or too long in duration, and which can cause damage to the circuits.

The Advantages of PTC Resettable Fuses

PTC resettable fuses are an ideal solution for many applications because they combine the advantages of conventional fuses with the convenience of resetting with the flip of a switch. Unlike conventional fuses, PTC resettable fuses do not need to be replaced after activation and can be used multiple times. Also, PTC resettable fuses are smaller than conventional fuses, making them simpler and easier to install in a variety of applications. They also feature fast-acting protection, minimal temperature rise, and low power consumption. As a result, PTC resettable fuses are reliable, cost-effective solutions for many electrical systems.

ASMDC300F/24-2 Application Field and Working Principle

The ASMDC300F/24-2 PTC resettable fuse is a high-current, over-temperature fuse with a switching circuit voltage rating of 24Vdc. It offers over-temperature protection and current overloading protection for various electrical components and systems, such as DC motors, power supplies, and AC/DC components. The ASMDC300F/24-2 operates on the working principle of thermal-magnetism: when the current through the device breaches a certain threshold, a heat-activated switch within the fuse is closed, redirecting the electrical current away from the component or system being protected. The device will then “trip” and the circuit will be open, thus protecting the component or system. The ASMDC300F/24-2 has a current holding capacity of 24A at 32°C, with a trip current of 30A at 32°C.When the operating temperature returns to normal, the fused connection will automatically reset itself, and the circuit will be restored. The device is designed to reset itself up to 15,000 times, making it suitable for large-scale applications that require frequent resetting of the circuits.

Conclusion

PTC resettable fuses offer a reliable solution for circuit protection and over-temperature protection in various DC electrical systems. The ASMDC300F/24-2 is a high-current, over-temperature fuse designed for 24Vdc systems with a current holding capacity of 24A at 32°C and a trip current of 30A at 32°C. The device is capable of resetting itself up to 15,000 times, making it suitable for large-scale applications that require frequent resetting of the circuits.

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