Technical specifications, features, applications and purchasing information.
| Brand | Littelfuse |
| Model Number | KLKR-1 |
| Manufacturer Catalog Number | KLKR001 |
| Product Marking | KLKR 1A |
| Product Category | Class CC Fast-Acting Fuse |
| Product Series | POWR-GARD KLKR |
| Current Rating | 1 A (1000 mA) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
| Fuse Class | UL Class CC |
| Operating Characteristic | Fast-Acting (Fast-Blow) |
| Fuse Type | Current-Limiting Cartridge Fuse |
| AC Interrupting Rating | 200 kA RMS Symmetrical (200,000 A) |
| DC Interrupting Rating | 20 kA (20,000 A, Manufacturer Self-Certified) |
| Total Clearing I²t | 80 A²s (Manufacturer 200 kA Test Condition) |
| Power Loss at 100% Rated Current | 0.38 W |
| Power Loss at 80% Rated Current | 0.20 W |
| Primary Protection Function | Fast Overload Protection |
| Intended Circuit Protection | General-Purpose Branch Circuit Protection |
| Fuse Format | Class CC Rejection-Style Cartridge |
| Nominal Dimensions | 10.3 x 38.1 mm (0.41 x 1.50 in) |
The Littelfuse KLKR-1 features a 1 ampere current rating, equivalent to 1000 milliamperes. It is designed for appropriately specified industrial control circuits and electrical equipment requiring Class CC fast-acting overcurrent protection.
The KLKR series provides a fast-acting response to overload conditions for electrical equipment requiring rapid circuit protection. Unlike the KLDR time-delay series, KLKR fuses are intended for applications where a fast overload response is required. Normal startup and inrush currents must be considered during fuse selection.
The fuse is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC voltage ratings support protective-device selection according to circuit operating voltage, installation requirements and available prospective short-circuit current.
Provides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. The available prospective fault current must remain within the applicable interrupting capacity.
The current-limiting construction helps reduce the heating and magnetic effects associated with short-circuit currents. Rejection-style construction helps prevent the installation of fuses with insufficient voltage or interrupting ratings when used with corresponding Class CC rejection-type fuse holders.
Littelfuse specifies a total clearing I²t of 80 A²s under the manufacturer's 200 kA test condition for KLKR001.T. Published power loss is 0.38 W at full rated current and 0.20 W at 80% rated current. The fuse uses a nominal 10.3 x 38.1 mm melamine-bodied cartridge with nickel-plated bronze end caps.
We support online purchase of the Littelfuse KLKR-1 Class CC Fast-Acting 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 KLKR-1?
It is a 1 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series, intended for general-purpose branch circuit protection and applications requiring fast overload response.
What is the manufacturer catalog number?
The manufacturer catalog number is KLKR001. The product marking is KLKR 1A, and Littelfuse lists KLKR001.T as the manufacturer ordering number for a 10-piece pack.
What is the current rating of KLKR-1?
The current rating is 1 ampere, equivalent to 1000 milliamperes.
What are the AC and DC voltage ratings?
Littelfuse specifies 600 VAC and 300 VDC. The circuit operating voltage must remain within the applicable AC or DC rating.
What are the interrupting ratings?
The AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC rating as self-certified.
Is KLKR-1 fast-acting or time-delay?
KLKR-1 is a fast-acting fuse. It belongs to the KLKR series, which provides fast overload response. The KLDR series has a different time-delay characteristic and is not automatically interchangeable.
Can KLKR-1 replace a KLDR-1 fuse?
Not automatically. Although both are Class CC fuses rated at 1 A, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on the circuit design, expected inrush current and required overcurrent response.
What is the total clearing I²t value for KLKR-1?
The manufacturer specifies a total clearing I²t of 80 A²s for ordering number KLKR001.T under its 200 kA test condition. This value applies specifically to the 1 A rating and should not be substituted with data from other KLKR models.
What is the power loss of KLKR-1?
Littelfuse specifies 0.38 W at 100% of rated current and 0.20 W at 80% of rated current. Actual operating conditions must be considered when evaluating heat dissipation in an enclosure or fuse holder.
What are the physical dimensions and construction materials?
The nominal dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series features a melamine body with nickel-plated bronze end caps. Littelfuse specifies a weight of 13.61 g for the 0.1 A through 1 A ratings.
Which fuse holders are recommended?
Littelfuse lists the L60030C and LPSC/LFPSC Touch-Safe holder series as accessories. Confirm the selected holder has the required Class CC compatibility, voltage rating and electrical capacity before installation.
Is KLKR-1 UL listed and RoHS compliant?
The KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.
What should be verified before ordering KLKR-1?
Confirm the KLKR-1 or KLKR001 designation, 1 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse holder compatibility and desired purchase quantity. Littelfuse lists KLKR001.T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.
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| Brand | Littelfuse |
| Model Number | KLKR-1 |
| Manufacturer Catalog Number | KLKR001 |
| Product Marking | KLKR 1A |
| Product Category | Class CC Fast-Acting Fuse |
| Product Series | POWR-GARD KLKR |
| Current Rating | 1 A (1000 mA) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
| Fuse Class | UL Class CC |
| Operating Characteristic | Fast-Acting (Fast-Blow) |
| Fuse Type | Current-Limiting Cartridge Fuse |
| AC Interrupting Rating | 200 kA RMS Symmetrical (200,000 A) |
| DC Interrupting Rating | 20 kA (20,000 A, Manufacturer Self-Certified) |
| Total Clearing I²t | 80 A²s (Manufacturer 200 kA Test Condition) |
| Power Loss at 100% Rated Current | 0.38 W |
| Power Loss at 80% Rated Current | 0.20 W |
| Primary Protection Function | Fast Overload Protection |
| Intended Circuit Protection | General-Purpose Branch Circuit Protection |
| Fuse Format | Class CC Rejection-Style Cartridge |
| Nominal Dimensions | 10.3 x 38.1 mm (0.41 x 1.50 in) |
The Littelfuse KLKR-1 features a 1 ampere current rating, equivalent to 1000 milliamperes. It is designed for appropriately specified industrial control circuits and electrical equipment requiring Class CC fast-acting overcurrent protection.
The KLKR series provides a fast-acting response to overload conditions for electrical equipment requiring rapid circuit protection. Unlike the KLDR time-delay series, KLKR fuses are intended for applications where a fast overload response is required. Normal startup and inrush currents must be considered during fuse selection.
The fuse is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. Separate AC and DC voltage ratings support protective-device selection according to circuit operating voltage, installation requirements and available prospective short-circuit current.
Provides an AC interrupting rating of 200 kA RMS symmetrical and a separate DC interrupting rating of 20 kA. Littelfuse identifies the DC rating as manufacturer self-certified. The available prospective fault current must remain within the applicable interrupting capacity.
The current-limiting construction helps reduce the heating and magnetic effects associated with short-circuit currents. Rejection-style construction helps prevent the installation of fuses with insufficient voltage or interrupting ratings when used with corresponding Class CC rejection-type fuse holders.
Littelfuse specifies a total clearing I²t of 80 A²s under the manufacturer's 200 kA test condition for KLKR001.T. Published power loss is 0.38 W at full rated current and 0.20 W at 80% rated current. The fuse uses a nominal 10.3 x 38.1 mm melamine-bodied cartridge with nickel-plated bronze end caps.
We support online purchase of the Littelfuse KLKR-1 Class CC Fast-Acting 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 KLKR-1?
It is a 1 A Class CC fast-acting, current-limiting cartridge fuse from the Littelfuse POWR-GARD KLKR series, intended for general-purpose branch circuit protection and applications requiring fast overload response.
What is the manufacturer catalog number?
The manufacturer catalog number is KLKR001. The product marking is KLKR 1A, and Littelfuse lists KLKR001.T as the manufacturer ordering number for a 10-piece pack.
What is the current rating of KLKR-1?
The current rating is 1 ampere, equivalent to 1000 milliamperes.
What are the AC and DC voltage ratings?
Littelfuse specifies 600 VAC and 300 VDC. The circuit operating voltage must remain within the applicable AC or DC rating.
What are the interrupting ratings?
The AC interrupting rating is 200,000 amperes RMS symmetrical, and the DC interrupting rating is 20,000 amperes. Littelfuse identifies the DC rating as self-certified.
Is KLKR-1 fast-acting or time-delay?
KLKR-1 is a fast-acting fuse. It belongs to the KLKR series, which provides fast overload response. The KLDR series has a different time-delay characteristic and is not automatically interchangeable.
Can KLKR-1 replace a KLDR-1 fuse?
Not automatically. Although both are Class CC fuses rated at 1 A, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on the circuit design, expected inrush current and required overcurrent response.
What is the total clearing I²t value for KLKR-1?
The manufacturer specifies a total clearing I²t of 80 A²s for ordering number KLKR001.T under its 200 kA test condition. This value applies specifically to the 1 A rating and should not be substituted with data from other KLKR models.
What is the power loss of KLKR-1?
Littelfuse specifies 0.38 W at 100% of rated current and 0.20 W at 80% of rated current. Actual operating conditions must be considered when evaluating heat dissipation in an enclosure or fuse holder.
What are the physical dimensions and construction materials?
The nominal dimensions are 10.3 mm in diameter and 38.1 mm in length. The KLKR series features a melamine body with nickel-plated bronze end caps. Littelfuse specifies a weight of 13.61 g for the 0.1 A through 1 A ratings.
Which fuse holders are recommended?
Littelfuse lists the L60030C and LPSC/LFPSC Touch-Safe holder series as accessories. Confirm the selected holder has the required Class CC compatibility, voltage rating and electrical capacity before installation.
Is KLKR-1 UL listed and RoHS compliant?
The KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse also identifies RoHS compliance and references CE Declaration of Conformity KLKR_210128_1. The DC interrupting rating is separately manufacturer self-certified.
What should be verified before ordering KLKR-1?
Confirm the KLKR-1 or KLKR001 designation, 1 A current rating, applicable 600 VAC or 300 VDC circuit requirement, fast-acting characteristic, interrupting capacity, Class CC fuse holder compatibility and desired purchase quantity. Littelfuse lists KLKR001.T for a manufacturer 10-piece pack; this does not establish the quantity supplied by an individual store listing.
