344_V01 LITTELFUSE | Alldatasheet
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Technical content
Cartridge Fuse Holders Datasheet © 2025 Littelfuse, Inc. Specifications are subject to change without notice. Revised: GD. 12/15/25
344 Series
Blown Fuse Indicating Holders for 3AG and 3AB Fuses
Ordering Information
Order Part number Catalog Number Voltage Range Lamp T ype Rating Lamp Current Rear Panel Lens Color 03440024H 344 024 16 to 32 28V Incandescent .04 amp Amber 03440125H 344 125 100 to 125 Neon .002 amp Clear 03440250H 344 250 200 to 250 Neon .002 amp Clear Product Characteristics Dimensions .627" .635" .567" .575"2.38" MAXIMUM WITH FUSE INSTALLED .09" x .13" HOLE IN SIDE TERMINAL .81" LOCK WASHERRUBBER WASHER HEX NUT .11" DIA..94" Mounting Hole Compatible Fuses 3AG, 3AB Electrical Rated at 20 amperes at lamp voltage shown below. Dielectric: withstanding voltage exceeds 1500 volts. All fuseholders are supplied with a resistor. When designing indicating type fuseholders into a circuit, consideration should be given to the resistance of fractional amperage fuses and the parallel resistance of the indicator lamp and 7its resistor. Mounting Withstands 15 lb.-in. mounting torque. Maximum panel thickness is .250” . Molded Parts Black Body and knob are thermoset (UL94 V-0), except lens is thermoplastic (UL 94HB). See Table below for lens color. Knob Bayonet style. T erminals Copper & copper alloy. Tin plated. Ambient T emperature –40ºC to +85ºC. Hardware Neoprene washer, lockwasher & hex nut unassembled. O-ring option available must be ordered separately using part number 901-108. Agency Agency File Number E14721 * Refer to Fuseology for information on proper fuseholder re-rating. Agency Approvals Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics. Web Resources Download ECAD models, order samples, and find technical recources at www.littelfuse.com