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Technical specifications, features, applications and purchasing information.
| Brand | Littelfuse |
| Model Number | KLDR-2-1/2 |
| Manufacturer Catalog Number | KLDR02.5 |
| Product Marking | KLDR 2 1/2A |
| Product Category | Class CC Time-Delay Fuse |
| Product Series | POWR-GARD KLDR |
| Current Rating | 2.5 A (2500 mA, 2-1/2 A) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
| Fuse Class | UL Class CC |
| Operating Characteristic | Time-Delay |
| Nominal Dimensions | 10.3 x 38.1 mm (0.41 x 1.50 in) |
| Body Material | Melamine |
| End Cap Material | Nickel-Plated Bronze |
| Terminal Configuration | Ferrule Ends |
| Special Feature | Rejection Capability |
| Fuse Weight | 8.62 g (0.019 lb, Series Specification) |
| Mounting Compatibility | Compatible Class CC Fuse Holders |
The Littelfuse KLDR-2-1/2 provides a 2.5 ampere current rating for appropriately specified industrial control circuits, control transformers and inductive electrical equipment. Its 2500 mA rating supports applications requiring Class CC time-delay overcurrent protection.
Rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC ratings allow protective-device selection according to operating voltage and available prospective short-circuit current.
The time-delay characteristic helps accommodate temporary magnetizing inrush currents associated with control transformers, solenoids and similar inductive loads. Littelfuse specifies a minimum opening time of 12 seconds at 200% of rated current under the applicable UL requirement, rather than a fixed clearing time.
Provides a 200 kA RMS symmetrical AC interrupting rating at 600 VAC and a separate 20 kA DC interrupting rating at 300 VDC. Littelfuse identifies the DC interrupting rating as self-certified. The available short-circuit current must not exceed the applicable interrupting rating.
The current-limiting design helps reduce the thermal and magnetic effects of short-circuit currents. Rejection-style construction helps prevent installation of unsuitable lower-voltage or lower-interrupting-rated fuses when installed in compatible rejection-type holders.
Features a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format. Compatible installation accessories include appropriately rated Class CC fuse holders from the Littelfuse L60030C, LPSC/LFPSC, LEC and 571/572 families.
We support online purchase of the Littelfuse KLDR-2-1/2 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. Please verify the required model, current rating and purchase quantity before ordering.
What is the Littelfuse KLDR-2-1/2?
It is a 2.5 A Class CC time-delay, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLDR series, designed for compatible control transformer, solenoid and industrial control applications.
What is the manufacturer catalog number?
The manufacturer catalog number is KLDR02.5. The product marking is KLDR 2 1/2A, and KLDR-2-1/2 is the corresponding fractional-amperage model designation.
What is the current rating?
The fuse is rated for 2.5 amperes, equivalent to 2500 milliamperes or two and one-half amperes.
What are the AC and DC voltage ratings?
The manufacturer specifies 600 VAC and 300 VDC. The operating circuit voltage must remain within the applicable AC or DC rating.
What are the AC and DC interrupting ratings?
The AC interrupting rating is 200,000 amperes RMS symmetrical at 600 VAC. The DC interrupting rating is 20,000 amperes at 300 VDC and is identified by Littelfuse as self-certified.
Is KLDR-2-1/2 a time-delay or fast-acting fuse?
KLDR-2-1/2 is a time-delay fuse. The KLDR series is designed to tolerate temporary magnetizing inrush currents associated with control transformers, solenoids and similar inductive equipment.
Does KLDR-2-1/2 open in exactly 12 seconds at twice its rated current?
No. The applicable UL requirement specifies an opening time of at least 12 seconds at 200% of rated current. This is a minimum requirement and not a fixed opening time. Consult the manufacturer time-current curves for circuit protection analysis.
What are the pre-arcing and total clearing I²t values?
Littelfuse specifies a pre-arcing I²t of 2.087 A²s and a total clearing I²t of 35.35 A²s. The total clearing value is published for the manufacturer's 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?
The KLDR series uses a melamine body with nickel-plated bronze caps. Littelfuse identifies compatible holder families including L60030C, LPSC/LFPSC, LEC and 571/572. Confirm the specific holder's electrical and mechanical compatibility before installation.
Is KLDR-2-1/2 UL listed and RoHS compliant?
Littelfuse identifies this KLDR fuse as UL Listed under file E81895 and CSA Certified under file LR29862 for the applicable AC ratings. The series is RoHS compliant, and the datasheet references a CE declaration. The DC interrupting rating is manufacturer self-certified.
What should be verified before ordering KLDR-2-1/2?
Confirm the KLDR-2-1/2 or KLDR02.5 model designation, 2.5 A current rating, applicable 600 VAC or 300 VDC circuit requirement, AC or DC interrupting capacity, time-delay characteristics, Class CC holder compatibility and purchase quantity. Littelfuse lists KLDR02.5TXP for a manufacturer 10-piece pack and KLDR02.5HXP for a 100-piece pack; these codes do not determine the quantity supplied by an individual store listing.
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| Brand | Littelfuse |
| Model Number | KLDR-2-1/2 |
| Manufacturer Catalog Number | KLDR02.5 |
| Product Marking | KLDR 2 1/2A |
| Product Category | Class CC Time-Delay Fuse |
| Product Series | POWR-GARD KLDR |
| Current Rating | 2.5 A (2500 mA, 2-1/2 A) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
| Fuse Class | UL Class CC |
| Operating Characteristic | Time-Delay |
| Nominal Dimensions | 10.3 x 38.1 mm (0.41 x 1.50 in) |
| Body Material | Melamine |
| End Cap Material | Nickel-Plated Bronze |
| Terminal Configuration | Ferrule Ends |
| Special Feature | Rejection Capability |
| Fuse Weight | 8.62 g (0.019 lb, Series Specification) |
| Mounting Compatibility | Compatible Class CC Fuse Holders |
The Littelfuse KLDR-2-1/2 provides a 2.5 ampere current rating for appropriately specified industrial control circuits, control transformers and inductive electrical equipment. Its 2500 mA rating supports applications requiring Class CC time-delay overcurrent protection.
Rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC ratings allow protective-device selection according to operating voltage and available prospective short-circuit current.
The time-delay characteristic helps accommodate temporary magnetizing inrush currents associated with control transformers, solenoids and similar inductive loads. Littelfuse specifies a minimum opening time of 12 seconds at 200% of rated current under the applicable UL requirement, rather than a fixed clearing time.
Provides a 200 kA RMS symmetrical AC interrupting rating at 600 VAC and a separate 20 kA DC interrupting rating at 300 VDC. Littelfuse identifies the DC interrupting rating as self-certified. The available short-circuit current must not exceed the applicable interrupting rating.
The current-limiting design helps reduce the thermal and magnetic effects of short-circuit currents. Rejection-style construction helps prevent installation of unsuitable lower-voltage or lower-interrupting-rated fuses when installed in compatible rejection-type holders.
Features a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format. Compatible installation accessories include appropriately rated Class CC fuse holders from the Littelfuse L60030C, LPSC/LFPSC, LEC and 571/572 families.
We support online purchase of the Littelfuse KLDR-2-1/2 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. Please verify the required model, current rating and purchase quantity before ordering.
What is the Littelfuse KLDR-2-1/2?
It is a 2.5 A Class CC time-delay, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLDR series, designed for compatible control transformer, solenoid and industrial control applications.
What is the manufacturer catalog number?
The manufacturer catalog number is KLDR02.5. The product marking is KLDR 2 1/2A, and KLDR-2-1/2 is the corresponding fractional-amperage model designation.
What is the current rating?
The fuse is rated for 2.5 amperes, equivalent to 2500 milliamperes or two and one-half amperes.
What are the AC and DC voltage ratings?
The manufacturer specifies 600 VAC and 300 VDC. The operating circuit voltage must remain within the applicable AC or DC rating.
What are the AC and DC interrupting ratings?
The AC interrupting rating is 200,000 amperes RMS symmetrical at 600 VAC. The DC interrupting rating is 20,000 amperes at 300 VDC and is identified by Littelfuse as self-certified.
Is KLDR-2-1/2 a time-delay or fast-acting fuse?
KLDR-2-1/2 is a time-delay fuse. The KLDR series is designed to tolerate temporary magnetizing inrush currents associated with control transformers, solenoids and similar inductive equipment.
Does KLDR-2-1/2 open in exactly 12 seconds at twice its rated current?
No. The applicable UL requirement specifies an opening time of at least 12 seconds at 200% of rated current. This is a minimum requirement and not a fixed opening time. Consult the manufacturer time-current curves for circuit protection analysis.
What are the pre-arcing and total clearing I²t values?
Littelfuse specifies a pre-arcing I²t of 2.087 A²s and a total clearing I²t of 35.35 A²s. The total clearing value is published for the manufacturer's 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?
The KLDR series uses a melamine body with nickel-plated bronze caps. Littelfuse identifies compatible holder families including L60030C, LPSC/LFPSC, LEC and 571/572. Confirm the specific holder's electrical and mechanical compatibility before installation.
Is KLDR-2-1/2 UL listed and RoHS compliant?
Littelfuse identifies this KLDR fuse as UL Listed under file E81895 and CSA Certified under file LR29862 for the applicable AC ratings. The series is RoHS compliant, and the datasheet references a CE declaration. The DC interrupting rating is manufacturer self-certified.
What should be verified before ordering KLDR-2-1/2?
Confirm the KLDR-2-1/2 or KLDR02.5 model designation, 2.5 A current rating, applicable 600 VAC or 300 VDC circuit requirement, AC or DC interrupting capacity, time-delay characteristics, Class CC holder compatibility and purchase quantity. Littelfuse lists KLDR02.5TXP for a manufacturer 10-piece pack and KLDR02.5HXP for a 100-piece pack; these codes do not determine the quantity supplied by an individual store listing.
