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Technical specifications, features, applications and purchasing information.
| Brand | Littelfuse |
| Model Number | KLDR-1/4 |
| Product Category | Class CC Time-Delay Fuse |
| Product Series | POWR-GARD KLDR |
| Current Rating | 0.25 A (250 mA, 1/4 A) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
The Littelfuse KLDR-1/4 provides a 0.25 ampere current rating for appropriately designed low-current industrial control circuits and inductive loads. Its 250 mA rating is suitable where quarter-ampere Class CC protection is specified.
Rated for compatible electrical circuits up to 600 VAC or 300 VDC. Littelfuse publishes separate AC and DC voltage and interrupting ratings, allowing the fuse to be evaluated for suitable industrial AC and DC applications.
Designed to accommodate temporary magnetizing current surges from control transformers, solenoids and similar inductive components. The UL opening-time requirement specifies a minimum of 12 seconds at 200% of rated current rather than a fixed clearing time.
Provides a 200 kA RMS symmetrical AC interrupting rating and a separately specified 20 kA DC interrupting rating. Littelfuse identifies the DC rating as self-certified. Circuit selection must account for available prospective fault current and the applicable voltage rating.
The current-limiting design helps reduce thermal and magnetic effects during short circuits. Its rejection feature helps prevent installation of unsuitable lower-voltage or lower-interrupting-rated fuses when used with corresponding rejection-type fuse holders.
Features a melamine body and nickel-plated bronze caps in a nominal 10.3 x 38.1 mm cartridge format. Compatible mounting options include appropriately rated Littelfuse L60030C and LPSC/LFPSC Class CC fuse holders.
We support online purchase of the Littelfuse KLDR-1/4 Class CC Time-Delay Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Confirm the required purchase quantity and packaging configuration before ordering.
What is the Littelfuse KLDR-1/4?
It is a 0.25 A Class CC time-delay, current-limiting cartridge fuse in the Littelfuse POWR-GARD KLDR series, intended for appropriately designed control transformer, solenoid and industrial control applications.
What is the manufacturer catalog number?
The 1/4 A version is identified as KLDR.250 in the Littelfuse manufacturer datasheet. KLDR-1/4 is a commonly used fractional-amperage model designation.
What is the current rating?
The current rating is 0.25 ampere, equivalent to 250 milliamperes or one-quarter of an ampere.
What are the AC and DC voltage ratings?
The fuse is rated for 600 VAC and 300 VDC. The appropriate rating must be selected according to the intended AC or DC circuit.
What are the AC and DC interrupting ratings?
The AC interrupting rating is 200,000 amperes RMS symmetrical, while the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC interrupting rating as self-certified.
Is KLDR-1/4 a time-delay or fast-acting fuse?
KLDR-1/4 is a time-delay fuse designed to accommodate temporary inrush currents associated with control transformers, solenoids and similar inductive components.
Does this fuse open in exactly 12 seconds at twice the rated current?
No. The UL agency requirement specifies a minimum opening time of 12 seconds at 200% of rated current. It is not a fixed opening time. Use the manufacturer time-current curves to assess actual circuit protection behavior.
What are the pre-arcing and total clearing I²t values?
Littelfuse lists a pre-arcing I²t value of 0.0138 A²s and a total clearing I²t value of 0.0967 A²s in the manufacturer electrical specifications table. The latter is identified under the 200 kA test condition.
What are the physical dimensions?
The nominal dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.41 inch by 1.50 inches.
What materials and fuse holders are used?
Littelfuse specifies a melamine body and nickel-plated bronze caps. Compatible fuse holders include appropriately specified products from the L60030C, LPSC/LFPSC, LEC and 571/572 series.
Is KLDR-1/4 UL listed and RoHS compliant?
The manufacturer identifies the KLDR series as UL Listed under file E81895, CSA Certified under file LR29862 and RoHS compliant. The datasheet also provides a CE declaration reference. The listed DC interrupting rating is self-certified.
What should be verified before ordering?
Confirm the KLDR-1/4 or KLDR.250 designation, 0.25 A current rating, 600 VAC or 300 VDC voltage requirement, applicable interrupting capacity, time-delay characteristics, fuse-holder compatibility and purchase quantity. Littelfuse lists KLDR.250TXP for a 10-piece manufacturer pack and KLDR.250HXP for a 100-piece manufacturer pack; these ordering codes do not establish the quantity provided by an individual retail listing.
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Available in stock (2000)
| Brand | Littelfuse |
| Model Number | KLDR-1/4 |
| Product Category | Class CC Time-Delay Fuse |
| Product Series | POWR-GARD KLDR |
| Current Rating | 0.25 A (250 mA, 1/4 A) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
The Littelfuse KLDR-1/4 provides a 0.25 ampere current rating for appropriately designed low-current industrial control circuits and inductive loads. Its 250 mA rating is suitable where quarter-ampere Class CC protection is specified.
Rated for compatible electrical circuits up to 600 VAC or 300 VDC. Littelfuse publishes separate AC and DC voltage and interrupting ratings, allowing the fuse to be evaluated for suitable industrial AC and DC applications.
Designed to accommodate temporary magnetizing current surges from control transformers, solenoids and similar inductive components. The UL opening-time requirement specifies a minimum of 12 seconds at 200% of rated current rather than a fixed clearing time.
Provides a 200 kA RMS symmetrical AC interrupting rating and a separately specified 20 kA DC interrupting rating. Littelfuse identifies the DC rating as self-certified. Circuit selection must account for available prospective fault current and the applicable voltage rating.
The current-limiting design helps reduce thermal and magnetic effects during short circuits. Its rejection feature helps prevent installation of unsuitable lower-voltage or lower-interrupting-rated fuses when used with corresponding rejection-type fuse holders.
Features a melamine body and nickel-plated bronze caps in a nominal 10.3 x 38.1 mm cartridge format. Compatible mounting options include appropriately rated Littelfuse L60030C and LPSC/LFPSC Class CC fuse holders.
We support online purchase of the Littelfuse KLDR-1/4 Class CC Time-Delay Fuse. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods. Confirm the required purchase quantity and packaging configuration before ordering.
What is the Littelfuse KLDR-1/4?
It is a 0.25 A Class CC time-delay, current-limiting cartridge fuse in the Littelfuse POWR-GARD KLDR series, intended for appropriately designed control transformer, solenoid and industrial control applications.
What is the manufacturer catalog number?
The 1/4 A version is identified as KLDR.250 in the Littelfuse manufacturer datasheet. KLDR-1/4 is a commonly used fractional-amperage model designation.
What is the current rating?
The current rating is 0.25 ampere, equivalent to 250 milliamperes or one-quarter of an ampere.
What are the AC and DC voltage ratings?
The fuse is rated for 600 VAC and 300 VDC. The appropriate rating must be selected according to the intended AC or DC circuit.
What are the AC and DC interrupting ratings?
The AC interrupting rating is 200,000 amperes RMS symmetrical, while the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC interrupting rating as self-certified.
Is KLDR-1/4 a time-delay or fast-acting fuse?
KLDR-1/4 is a time-delay fuse designed to accommodate temporary inrush currents associated with control transformers, solenoids and similar inductive components.
Does this fuse open in exactly 12 seconds at twice the rated current?
No. The UL agency requirement specifies a minimum opening time of 12 seconds at 200% of rated current. It is not a fixed opening time. Use the manufacturer time-current curves to assess actual circuit protection behavior.
What are the pre-arcing and total clearing I²t values?
Littelfuse lists a pre-arcing I²t value of 0.0138 A²s and a total clearing I²t value of 0.0967 A²s in the manufacturer electrical specifications table. The latter is identified under the 200 kA test condition.
What are the physical dimensions?
The nominal dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.41 inch by 1.50 inches.
What materials and fuse holders are used?
Littelfuse specifies a melamine body and nickel-plated bronze caps. Compatible fuse holders include appropriately specified products from the L60030C, LPSC/LFPSC, LEC and 571/572 series.
Is KLDR-1/4 UL listed and RoHS compliant?
The manufacturer identifies the KLDR series as UL Listed under file E81895, CSA Certified under file LR29862 and RoHS compliant. The datasheet also provides a CE declaration reference. The listed DC interrupting rating is self-certified.
What should be verified before ordering?
Confirm the KLDR-1/4 or KLDR.250 designation, 0.25 A current rating, 600 VAC or 300 VDC voltage requirement, applicable interrupting capacity, time-delay characteristics, fuse-holder compatibility and purchase quantity. Littelfuse lists KLDR.250TXP for a 10-piece manufacturer pack and KLDR.250HXP for a 100-piece manufacturer pack; these ordering codes do not establish the quantity provided by an individual retail listing.
