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Technical specifications, features, applications and purchasing information.
| Brand | Littelfuse |
| Model Number | KLDR-4-1/2 |
| Manufacturer Catalog Number | KLDR04.5 |
| Product Marking | KLDR 4 1/2A |
| Product Category | Class CC Time-Delay Fuse |
| Product Series | POWR-GARD KLDR |
| Current Rating | 4.5 A (4500 mA, 4-1/2 A) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
| Fuse Class | UL Class CC |
| Operating Characteristic | Time-Delay |
| Fuse Type | Current-Limiting Cartridge Fuse |
| AC Interrupting Rating | 200 kA RMS Symmetrical at 600 VAC (200,000 A) |
| DC Interrupting Rating | 20 kA at 300 VDC (20,000 A, Manufacturer Self-Certified) |
| Opening Time at 135% Rated Current | 60 Minutes Maximum (UL Requirement) |
| Opening Time at 200% Rated Current | 12 Seconds Minimum (UL Requirement) |
| Pre-Arcing I²t | 83.89 A²s |
| Total Clearing I²t | 110.6 A²s (Manufacturer 200 kA Test Condition) |
| Fuse Format | Class CC Rejection-Style Cartridge |
| 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, Manufacturer Series Specification) |
| Mounting Compatibility | Compatible Class CC Fuse Holders |
| Manufacturer Ordering Number, 10-Pack | KLDR04.5TXP |
| Manufacturer Ordering Number, 100-Pack | KLDR04.5HXP |
| UPC, Manufacturer 10-Pack | 07945879262 |
| UPC, Manufacturer 100-Pack | 07945879305 |
| UL Approval | UL Listed, UL 248-4 Class CC, File E81895 (AC) |
| CSA Approval | CSA Certified, File LR29862 (AC) |
| CE Compliance | CE Declaration Referenced in Manufacturer Datasheet |
| RoHS Compliance | RoHS Compliant |
| Country of Origin | Mexico (Manufacturer Datasheet) |
| Recommended Fuse Holder Series | L60030C, LPSC/LFPSC Touch-Safe, LEC, 571/572 |
The Littelfuse KLDR-4-1/2 provides a 4.5 ampere current rating for appropriately specified industrial control circuits, control transformers and inductive electrical equipment. Its 4500 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 accommodates temporary magnetizing inrush currents associated with control transformers, solenoids and other 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. Available fault current must remain within the applicable interrupting capacity.
The current-limiting design helps reduce heating and magnetic effects during short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with compatible rejection-type fuse holders.
Features a melamine body, nickel-plated bronze caps and a nominal 10.3 x 38.1 mm cartridge format. Compatible mounting accessories include appropriately rated Littelfuse L60030C, LPSC/LFPSC, LEC and 571/572 fuse holder families.
We support online purchase of the Littelfuse KLDR-4-1/2 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-4-1/2?
It is a 4.5 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 KLDR04.5. The product marking is KLDR 4 1/2A, and KLDR-4-1/2 is the corresponding fractional-amperage model designation.
What is the current rating?
The fuse is rated for 4.5 amperes, equivalent to 4500 milliamperes or four 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 corresponding 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-4-1/2 a time-delay or fast-acting fuse?
KLDR-4-1/2 is a time-delay fuse. Its operating characteristic is intended to accommodate brief magnetizing inrush currents associated with control transformers, solenoids and similar inductive equipment.
Does KLDR-4-1/2 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 rather than a fixed clearing time. Consult the manufacturer's time-current curves for circuit protection analysis.
What are the pre-arcing and total clearing I²t values?
Littelfuse specifies a pre-arcing I²t of 83.89 A²s and a total clearing I²t of 110.6 A²s. The total clearing value is published for the manufacturer's 200 kA test condition. These values are specific to KLDR04.5 and should not be confused with the 4 A or 5 A versions.
What are the physical dimensions?
The nominal cartridge 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 electrical and mechanical compatibility of the specific holder before installation.
Is KLDR-4-1/2 UL listed and RoHS compliant?
Littelfuse identifies the KLDR series as UL Listed under file E81895 and CSA Certified under file LR29862 for the applicable AC ratings. The series is RoHS compliant, and its datasheet references a CE declaration. The DC interrupting rating is manufacturer self-certified.
What should be verified before ordering KLDR-4-1/2?
Confirm the KLDR-4-1/2 or KLDR04.5 designation, 4.5 A current rating, applicable 600 VAC or 300 VDC circuit requirement, AC or DC interrupting capacity, time-delay characteristics, Class CC fuse-holder compatibility and purchase quantity. Littelfuse lists KLDR04.5TXP for a manufacturer 10-piece pack and KLDR04.5HXP for a 100-piece pack; these ordering numbers do not determine the quantity supplied by an individual store listing.
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| Brand | Littelfuse |
| Model Number | KLDR-4-1/2 |
| Manufacturer Catalog Number | KLDR04.5 |
| Product Marking | KLDR 4 1/2A |
| Product Category | Class CC Time-Delay Fuse |
| Product Series | POWR-GARD KLDR |
| Current Rating | 4.5 A (4500 mA, 4-1/2 A) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
| Fuse Class | UL Class CC |
| Operating Characteristic | Time-Delay |
| Fuse Type | Current-Limiting Cartridge Fuse |
| AC Interrupting Rating | 200 kA RMS Symmetrical at 600 VAC (200,000 A) |
| DC Interrupting Rating | 20 kA at 300 VDC (20,000 A, Manufacturer Self-Certified) |
| Opening Time at 135% Rated Current | 60 Minutes Maximum (UL Requirement) |
| Opening Time at 200% Rated Current | 12 Seconds Minimum (UL Requirement) |
| Pre-Arcing I²t | 83.89 A²s |
| Total Clearing I²t | 110.6 A²s (Manufacturer 200 kA Test Condition) |
| Fuse Format | Class CC Rejection-Style Cartridge |
| 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, Manufacturer Series Specification) |
| Mounting Compatibility | Compatible Class CC Fuse Holders |
| Manufacturer Ordering Number, 10-Pack | KLDR04.5TXP |
| Manufacturer Ordering Number, 100-Pack | KLDR04.5HXP |
| UPC, Manufacturer 10-Pack | 07945879262 |
| UPC, Manufacturer 100-Pack | 07945879305 |
| UL Approval | UL Listed, UL 248-4 Class CC, File E81895 (AC) |
| CSA Approval | CSA Certified, File LR29862 (AC) |
| CE Compliance | CE Declaration Referenced in Manufacturer Datasheet |
| RoHS Compliance | RoHS Compliant |
| Country of Origin | Mexico (Manufacturer Datasheet) |
| Recommended Fuse Holder Series | L60030C, LPSC/LFPSC Touch-Safe, LEC, 571/572 |
The Littelfuse KLDR-4-1/2 provides a 4.5 ampere current rating for appropriately specified industrial control circuits, control transformers and inductive electrical equipment. Its 4500 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 accommodates temporary magnetizing inrush currents associated with control transformers, solenoids and other 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. Available fault current must remain within the applicable interrupting capacity.
The current-limiting design helps reduce heating and magnetic effects during short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with compatible rejection-type fuse holders.
Features a melamine body, nickel-plated bronze caps and a nominal 10.3 x 38.1 mm cartridge format. Compatible mounting accessories include appropriately rated Littelfuse L60030C, LPSC/LFPSC, LEC and 571/572 fuse holder families.
We support online purchase of the Littelfuse KLDR-4-1/2 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-4-1/2?
It is a 4.5 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 KLDR04.5. The product marking is KLDR 4 1/2A, and KLDR-4-1/2 is the corresponding fractional-amperage model designation.
What is the current rating?
The fuse is rated for 4.5 amperes, equivalent to 4500 milliamperes or four 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 corresponding 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-4-1/2 a time-delay or fast-acting fuse?
KLDR-4-1/2 is a time-delay fuse. Its operating characteristic is intended to accommodate brief magnetizing inrush currents associated with control transformers, solenoids and similar inductive equipment.
Does KLDR-4-1/2 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 rather than a fixed clearing time. Consult the manufacturer's time-current curves for circuit protection analysis.
What are the pre-arcing and total clearing I²t values?
Littelfuse specifies a pre-arcing I²t of 83.89 A²s and a total clearing I²t of 110.6 A²s. The total clearing value is published for the manufacturer's 200 kA test condition. These values are specific to KLDR04.5 and should not be confused with the 4 A or 5 A versions.
What are the physical dimensions?
The nominal cartridge 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 electrical and mechanical compatibility of the specific holder before installation.
Is KLDR-4-1/2 UL listed and RoHS compliant?
Littelfuse identifies the KLDR series as UL Listed under file E81895 and CSA Certified under file LR29862 for the applicable AC ratings. The series is RoHS compliant, and its datasheet references a CE declaration. The DC interrupting rating is manufacturer self-certified.
What should be verified before ordering KLDR-4-1/2?
Confirm the KLDR-4-1/2 or KLDR04.5 designation, 4.5 A current rating, applicable 600 VAC or 300 VDC circuit requirement, AC or DC interrupting capacity, time-delay characteristics, Class CC fuse-holder compatibility and purchase quantity. Littelfuse lists KLDR04.5TXP for a manufacturer 10-piece pack and KLDR04.5HXP for a 100-piece pack; these ordering numbers do not determine the quantity supplied by an individual store listing.
