PFSM.200.2 Circuit Protection

Resistance - Initial (Ri) (Min):	45 mOhms
Approvals:	cURus, TUV
Lead Spacing:	--
Thickness (Max):	0.118" (3.00mm)
Height - Seated (Max):	--
Size / Dimension:	0.344" L x 0.264" W (8.75mm x 6.71mm)
Package / Case:	2-SMD
Mounting Type:	Surface Mount
Ratings:	AEC-Q200
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	125 mOhms
Series:	PFSM
Time to Trip:	12s
Current - Trip (It):	4A
Current - Hold (Ih) (Max):	2A
Current - Max:	100A
Voltage - Max:	15V
Type:	Polymeric
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PTC Resettable Fuses – PFSM.200.2 Application Field and Working Principle

PTC Resettable Fuses are a type of electrical protection devices commonly used in trucks, automobiles and electronics. They are designed to detect and disconnect a fault condition in the event of an over-current or short circuit. The PTC Resettable Fuses, also known as Polymeric Positive Temperature Coefficient (PPTC) fuses, are based on a nonlinear PTC resistor. This type of fuse employs a temperature sensitive material, usually polymeric, as the active element. When a current flows through the device, the element\'s resistance increases until the current is stopped or the circuit is disconnected, thereby providing protection from an overload or short circuit.In order to understand how the PTC Resettable Fuses work, let us take a closer look at the PFSM.200.2 Resettable Fuses. The PFSM.200.2 is a two-terminal PTC device designed to detect and disconnect both normal and fault currents up to 200 A. It features a positive temperature coefficient (PTC) element with a highly reliable, flame-retardant polymeric material. This device has the ability to detect and reset itself after an over-current fault, and the device has a very low impedance even during a short circuit current.The PFSM.200.2 is a radial-leaded device that features a maximum standing voltage rating of 250 VAC and a maximum operating temperature of 125°C. It is designed to provide protection by disconnecting the circuit when a fault current of 200 A is detected. The device is also certified according to UL77, CSA 22.2, and EN60335. The PFSM.200.2 uses a series of thermal, electrical and overload components to detect and disconnect faults. The components include a thermal fusing element, a detonator and a nonlinear PTC element. In order for the device to disconnect the circuit, the thermal element must reach a certain temperature. When the thermal element reaches the designated thermal threshold, the detonator triggers, the nonlinear element increases the device impedance, and the fuse disconnects the circuit.The PFSM.200.2 is an ideal device for protecting high-power electronic circuits, including motor controllers, HVAC units, automotive circuits, home appliances and other electronic components. Its high breaking capacity ensures that the device will disconnect a higher level fault current than a conventional fuse, and its low impedance maintains a low levels of arcing or sparks when the device trips.The PFSM.200.2 offers superior protection from thermal overloads, short circuits and other overloads that could damage sensitive electronic components. Its excellent response time and high breaking capacity make it the ideal choice for automotive and home appliance applications. This type of fuse can be used either on vertical or horizontal printed circuit boards and it can also be used in enclosed circuits, providing highly reliable operation.In conclusion, PTC Resettable Fuses offer robust protection from thermal, electrical and overload conditions. Their ability to reset automatically ensures minimal downtime and a higher level of reliability than traditional fuse types. The PFSM.200.2 is a popular device due to its high performance, excellent response time and superior breaking capacity, making it a great choice for automotive and home appliance applications.

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