30R090UPR Circuit Protection

Resistance - Initial (Ri) (Min):	70 mOhms
Approvals:	cURus, TUV
Lead Spacing:	0.201" (5.10mm)
Thickness (Max):	--
Height - Seated (Max):	0.480" (12.20mm)
Size / Dimension:	0.291" L x 0.118" W (7.40mm x 3.00mm)
Package / Case:	Radial, Disc
Mounting Type:	Through Hole
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Resistance - Post Trip (R1) (Max):	220 mOhms
Series:	POLY-FUSE®, 30R
Time to Trip:	5.9s
Current - Trip (It):	1.8A
Current - Hold (Ih) (Max):	900mA
Current - Max:	40A
Voltage - Max:	30V
Type:	Polymeric
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Box (TB)

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<p>PTC Resettable Fuses are an integral part of the power supply industry and provide a economical, practical and reliable solution for over-current protection applications. The 30R090UPR is a high-end resettable fuse designed to provide safety and over-current protection for multiple applications. With a wide range of features and capabilities, the 30R090UPR provides unmatched value for its price.</p><p>The 30R090UPR is a premium resettable fuse which provides reliable protection over a wide range of applications. It is designed with a low initial resistance, which allows it to rapidly react to an overload or short-circuit condition and open quickly, thus providing overcurrent protection before any damage is caused to the circuit. The fuse also has a high maximum operating temperature, which allows it to be used in environments with high temperatures. Additionally, the 30R090UPR features a self-resetting mechanism, which ensures that the fuse will automatically reset to its original state after the overload or short circuit condition has been cleared.</p><p>The 30R090UPR is typically used in applications such as telecommunications, power supplies, and other similar equipment requiring protection from overvoltage conditions. This resettable fuse is designed to be installed as a parallel protection device between the power supply and the load. The 30R090UPR is an inexpensive way to protect your equipment from damage due to overcurrent conditions.</p><p>The working principle of the 30R090UPR is straight forward. The device is composed of two parts, the PTC thermistor and the varistor. The PTC thermistor is a negative temperature coefficient resistor that is in parallel with the load and the power supplies. This PTC thermistor has a predetermined resistance value at normal ambient temperatures.</p><p>When the load current increases, the temperature of the PTC thermistor also increases which causes the resistance to decrease. This decrease in resistance creates an imbalance between the power supply and the load, and this imbalance causes a surge in voltage that trips the resettable fuse. The fuse then opens, removing the excess current that could cause damage to the load.</p><p>The varistor is another component of the 30R090UPR which provides protection from overvoltage conditions. The varistor is in series with the power supplies and load and is designed to pass current below a certain voltage. However, when the voltage increases beyond this predetermined limit, the varistor will stop allowing any current to flow, thus protecting the equipment from damage due to overvoltage.</p><p>The 30R090UPR is a reliable and cost effective solution for providing protection from overcurrents and overvoltages. The device is designed to be compact in size, allowing for easy installation and maintenance. The 30R090UPR is a great option for protecting any electronic device from overvoltage conditions.</p>

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