Littelfuse, Inc. Datasheets for Circuit Protection Components

Circuit protection devices are used to protect electronic components from unwanted transients such as current and voltage surges, electrostatic discharge (ESD), lightning, spikes and other signals that can imperil the operation or damage the component.
Circuit Protection Components: Learn more

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Product Name	Notes
RF4176-000 RF4177-000 RF4178-000 RF4179-000 RF4207-000 RF4213-000 RF4214-000 RF4232-000 RF4246-000 RF4249-000 RF4250-000 RF4251-000 RF4252-000 RF4253-000 RF4254-000 RF4255-000 RF4256-000 RF4257-000 RF4258-000 RF4259-000 RF4260-000 RF4261-000 RF4263-000 RF4269-000 RF4274-000 RF4278-000 RF4280-000 RF4282-000 RF4298-000 RF4310-000 RF4314-000 RF4315-000 RF4317-000 RF4318-000 RF4319-000 RF4320-000 RF4321-000 RF4322-000 RF4323-000 RF4324-000 RF4325-000 RF4344-000 RF4345-000 RF4357-000 RF4370-000 RF4371-000 RF4372-000 RF4373-000 RF4374-000 RF4375-000 RF4376-000 RF4377-000 RF4378-000 RF4397-000 RF4414-000 RF4428-000 RF4432-000 RF4435-000 RF4436-000 RF4437-000 RF4438-000 RF4439-000 RF4441-000 RF4451-000 RF4452-000 RF4456-000 RF4466-000 RF4480-000 RF4481-000 RF4510-000 RF4513-000 RF4516-000 RF4525-000 RF4558-000 RF4559-000 RF4560-000 RF4561-000 RF4562-000 RF4564-000 RF4565-000 RF4566-000 RF4567-000 RF4568-000 RF4569-000 RF4570-000 RF4571-000 RF4572-000 RF4573-000 RF4574-000 RF4601-000 RF4610-000 RF4611-000 RF4629-000 RF4634-000 RF4635-000 RF4636-000 RF4637-000 RF4638-000 RF4639-000 RF4640-000 RF4641-000 RF4642-000 RF4668-000 RF4677-000 RF4689-000 RF4711-000 RF4725-000 RF4726-000 RF4744-000 RF4785-000 RF4786-000 RF4787-000 RF4801-000 RF4811-000 RF4816-000 RF4828-000 RF4849-000 RF4862-000 RF4866-000 RF4867-000 RF4894-000 RF4906-000 RF4927-000 RF4929-000 RF4983-000 RF4989-000 RF4990-000 RF4991-000 RF4992-000 RF4993-000 RF4994-000 RF4995-000 RF4996-000 RF4997-000 RF4998-000 RF4999-000 RF5000-000 RF5001-000 RF5002-000 RF5003-000 RF5004-000 RF5005-000 RF5006-000 RF5023-000 RF5024-000 RF5025-000 RF5026-000 RF5027-000 RF5029-000 RF5030-000 RF5031-000 RF5032-000 RF5033-000 RF5034-000 RF5051-000 RF5052-000 RF5053-000 RF5054-000 RF5055-000 RF5062-000 RF5079-000 RF5091-000 RF5098-000 RF5105-000 RF5118-000 RF5155-000 RGE1000 RGE1100 RGE1200 RGE500 RGEF1000 RGEF1000-1 RGEF1000-2 RGEF1100 RGEF1100-2 RGEF1200 RGEF1200-1 RGEF1200-2 RGEF1400 RGEF1400-1 RGEF1400-2 RGEF250 RGEF250-2 RGEF250-AP RGEF300 RGEF300-1 RGEF300-2 RGEF300K RGEF300K-2 RGEF400 RGEF400-2 RGEF400-AP RGEF400K RGEF400K-2 RGEF400K-AP RGEF500 RGEF500-0.178 RGEF500-1 RGEF500-2 RGEF500-AP RGEF500K RGEF500K-2 RGEF500K-AP RGEF600 RGEF600-1 RGEF600-2 RGEF600K RGEF600K-2 RGEF600K-AP RGEF700 RGEF700-1 RGEF700-2 RGEF700-AP RGEF700K RGEF700K-2 RGEF800 RGEF800-1 RGEF800-2 RGEF800K RGEF900 RGEF900-1 RGEF900-2 RHE070 RHE1000 RHE1300 RHE1500 RHE400 RHE450 RHE600 RHE650 RHE750 RHEF050 RHEF050-2 RHEF050-AP RHEF070 RHEF070-2 RHEF070-AP RHEF070U RHEF070U-2 RHEF100 RHEF100-2 RHEF100-AP RHEF1000 RHEF1000-2 RHEF1100 RHEF1300 RHEF1300-2 RHEF1400 RHEF1500 RHEF1500-2 RHEF200 RHEF200-2 RHEF300 RHEF400 RHEF400-2 RHEF450 RHEF450-2 RHEF550 RHEF600 RHEF600-2 RHEF600S RHEF650 RHEF650-2 RHEF700 RHEF750 RHEF750-1 RHEF750-2 RHEF750-AP RHEF800 RHEF900 RHEF900-2 RHEF900-AP RK-102 RK-105 RK-105I RK-132 RK-302 RK-310G-00 RK-310R-00 RK-310R-01 RK-311G-00 RK-311G-01 RK-311R-00 RK-311R-01 RK-325 RK-325I RK-332 RKEF050 RKEF050-AP RKEF065 RKEF065-AP RKEF075 RKEF075-2 RKEF090 RKEF110 RKEF135 RKEF160 RKEF185 RKEF250 RKEF250K RKEF300 RKEF300-2 RKEF375 RKEF375K RKEF400 RKEF400-2 RKEF500 RKEF500-1 RKEF500-2 RKEF500K-2 RM-1000-ENCL RM1000 RM1000 NEMA 4 RM1000-3R RM2000 RM2000-CBM+ RM2000-RTDW RS1A11 RS2B44 RS485-RS232 RS485-USB RS4A11 RS4A12 RS4A13 RS4A24 RS4A33 RS4B12 RS6A13 RTE120 RTE135 RTE190 RUE090 RUE110 RUE135 RUE160 RUE185 RUE250 RUE250U-2 RUE300 RUE400 RUE400-1 RUE500 RUE600 RUE700 RUE800 RUE900 RUEF090 RUEF090-1 RUEF090-2 RUEF090-AP RUEF110 RUEF110-1 RUEF110-2 RUEF110-AP RUEF110S RUEF135 RUEF135-1 RUEF135-2 RUEF135-AP RUEF135S RUEF160 RUEF160-1 RUEF160-2 RUEF160-AP RUEF160S RUEF185 RUEF185-1 RUEF185-2 RUEF185-AP RUEF185S RUEF250 RUEF250-1 RUEF250-2 RUEF250-AP RUEF250S RUEF250U RUEF250U-2 RUEF300 RUEF300-2 RUEF300-AP RUEF300K RUEF300K-2 RUEF300K-AP RUEF300U RUEF300U-2 RUEF400 RUEF400-1 RUEF400-2 RUEF400-AP RUEF400K RUEF400K-0.138 RUEF400K-2 RUEF400K-AP RUEF500 RUEF500-1 RUEF500-2 RUEF500K RUEF500K-2 RUEF500K-AP RUEF600 RUEF600-1 RUEF600-2 RUEF600-AP RUEF600K RUEF600K-0.144 RUEF600K-2 RUEF600K-AP RUEF700 RUEF700-2 RUEF700K RUEF700K-2 RUEF800 RUEF800-1 RUEF800-2 RUEF800K RUEF800K-2 RUEF900 RUEF900-1 RUEF900-2 RUEF900K RUEF900K-0.144 RUEF900K-2 RUSB075 RUSB090 RUSB110 RUSB120 RUSB135 RUSB155 RUSB160 RUSB185 RUSB250 RUSBF075 RUSBF075-1 RUSBF075-2 RUSBF075-AP RUSBF090 RUSBF090-2 RUSBF090-AP RUSBF110 RUSBF110-2 RUSBF110-AP RUSBF120 RUSBF120-2 RUSBF120-AP RUSBF135 RUSBF135-2 RUSBF135-AP RUSBF155 RUSBF155-2 RUSBF155-AP RUSBF160 RUSBF160-2 RUSBF185 RUSBF185-2 RUSBF185-AP RUSBF250 RUSBF250-2
Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD16 - RLD16P1100G -- RLD16P1100G Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD16 - RLD16P1400G -- RLD16P1400G Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD16 - RLD16P700G -- RLD16P700G Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD16 - RLD16P900G -- RLD16P900G	For automotive and transformer applications with demand for high hold currents.
Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P010X -- RLD60P010X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P017X -- RLD60P017X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P020X -- RLD60P020X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P025X -- RLD60P025X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P030X -- RLD60P030X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P040X -- RLD60P040X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P050X -- RLD60P050X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P065X -- RLD60P065X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P075X -- RLD60P075X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P090X -- RLD60P090X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P110X -- RLD60P110X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P135X -- RLD60P135X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P160X -- RLD60P160X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P185X -- RLD60P185X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P250X -- RLD60P250X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P300X -- RLD60P300X Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD60 - RLD60P375X -- RLD60P375X	These 60V RLDs were designed to be generalpurpose resettable fuses. As such, they are capable of protecting a large variety of circuits, including power supplies, speakers, security and alarm systems,...
Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P090U -- RLD30P090U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P110U -- RLD30P110U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P135U -- RLD30P135U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P160U -- RLD30P160U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P185U -- RLD30P185U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P250U -- RLD30P250U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P300U -- RLD30P300U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P400U -- RLD30P400U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P500U -- RLD30P500U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P600U -- RLD30P600U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P700U -- RLD30P700U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P800U -- RLD30P800U Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD30 - RLD30P900U -- RLD30P900U	This 30 V product line can be used in almost anywhere there is a low voltage power supply (<30 v="" dc)="" and="" a="" load="" to="" be="" protected="" including=""> General electronics...
Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD USB - RLD06P075B -- RLD06P075B Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD USB - RLD06P120B -- RLD06P120B Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD USB - RLD06P155B -- RLD06P155B Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD USB - RLD16P090B -- RLD16P090B Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD USB - RLD16P110B -- RLD16P110B Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD USB - RLD16P135B -- RLD16P135B Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD USB - RLD16P160B -- RLD16P160B Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD USB - RLD16P185B -- RLD16P185B Fuses & Overcurrent Protection - PolySwitch® Resettable PPTC Devices - Radial Leaded - PolySwitch® Resettable PPTC Devices - Series: RLD USB - RLD16P250B -- RLD16P250B	This new radial leaded products are designed specifically for Universal Serial Bus (USB) appliations with low resistance, faster time-to-trip and low voltage drop features.

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