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Technical specifications, features, applications and purchasing information.
| Brand | Littelfuse |
| Model Number | KLKR-12 |
| Product Category | Class CC Fast-Acting Fuse |
| Product Series | POWR-GARD KLKR |
| Current Rating | 12 A (12000 mA) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
| Nominal Dimensions | 10.3 x 38.1 mm (0.41 x 1.50 in) |
| Body Material | Melamine |
The Littelfuse KLKR-12 features a 12 ampere current rating, equivalent to 12000 milliamperes. It is designed for appropriately specified industrial electrical equipment, control circuits and branch circuit applications requiring Class CC fast-acting overcurrent protection.
The KLKR series provides fast-acting protection for electrical circuits requiring a rapid response to overload conditions. Unlike the time-delay Littelfuse KLDR series, KLKR fuses are intended for fast overload protection. Expected startup currents, temporary load changes and inrush conditions must be evaluated when selecting a fuse.
The KLKR-12 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate voltage ratings support protective-device selection according to circuit type, operating voltage and available prospective short-circuit current.
The KLKR series 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. Available prospective fault current must remain within the applicable interrupting capacity.
The current-limiting design helps reduce heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with compatible Class CC rejection-type fuse holders.
Littelfuse specifies a total clearing I²t of 350 A²s at its 200 kA test condition, power loss of 1.58 W at 100% rated current and 0.83 W at 80% rated current for KLKR012.T. The fuse features a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format.
We support online purchase of the Littelfuse KLKR-12 Class CC Fast-Acting Fuse. If you need to make bulk purchases or inquire about other products, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.
What is the Littelfuse KLKR-12?
The Littelfuse KLKR-12 is a 12 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.
What is the manufacturer catalog number?
The manufacturer catalog number is KLKR012. The product marking is KLKR 12A, and KLKR012.T is the manufacturer's ordering number for a 10-piece pack.
What is the current rating?
The rated current is 12 amperes, equivalent to 12000 milliamperes.
What are the AC and DC voltage ratings?
The KLKR series is rated for 600 VAC and 300 VDC. Select the applicable rating according to the circuit type and operating voltage.
What are the interrupting ratings?
The AC interrupting rating is 200 kA RMS symmetrical, and the DC interrupting rating is 20 kA. Littelfuse identifies the DC interrupting rating as manufacturer self-certified.
Is KLKR-12 fast-acting or time-delay?
KLKR-12 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.
Can KLKR-12 replace KLDR-12?
Not automatically. Although both are Class CC fuses rated at 12 A, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on circuit design, expected inrush current, overload response and protective-device coordination requirements.
What is the total clearing I²t value?
Littelfuse specifies a total clearing I²t of 350 A²s for KLKR012.T under the manufacturer's 200 kA test condition. This value is specific to the 12 A rating and should not be substituted with data from another KLKR model.
What is the power loss at rated current?
Littelfuse specifies a power loss of 1.58 W at 100% rated current and 0.83 W at 80% rated current for KLKR012.T. These values can help evaluate operating heat dissipation when selecting a compatible fuse holder and designing an electrical panel.
What are the dimensions and construction materials?
The nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.41 x 1.50 inches. The KLKR series uses a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for ratings from 1.5 A through 30 A.
Which fuse holders are recommended?
Littelfuse lists the L60030C and LPSC/LFPSC Touch-Safe fuse holder series as accessories. Verify Class CC compatibility, operating voltage and applicable electrical ratings before installation.
Is KLKR-12 UL listed and RoHS compliant?
The KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse identifies the series as RoHS compliant and provides manufacturer conformity documentation. The DC interrupting rating is separately manufacturer self-certified.
What should be checked before ordering KLKR-12?
Confirm the KLKR-12 or KLKR012 designation, 12 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. KLKR012.T is the manufacturer's 10-piece ordering number; confirm the actual selling quantity separately.
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| Brand | Littelfuse |
| Model Number | KLKR-12 |
| Product Category | Class CC Fast-Acting Fuse |
| Product Series | POWR-GARD KLKR |
| Current Rating | 12 A (12000 mA) |
| AC Voltage Rating | 600 VAC |
| DC Voltage Rating | 300 VDC |
| Nominal Dimensions | 10.3 x 38.1 mm (0.41 x 1.50 in) |
| Body Material | Melamine |
The Littelfuse KLKR-12 features a 12 ampere current rating, equivalent to 12000 milliamperes. It is designed for appropriately specified industrial electrical equipment, control circuits and branch circuit applications requiring Class CC fast-acting overcurrent protection.
The KLKR series provides fast-acting protection for electrical circuits requiring a rapid response to overload conditions. Unlike the time-delay Littelfuse KLDR series, KLKR fuses are intended for fast overload protection. Expected startup currents, temporary load changes and inrush conditions must be evaluated when selecting a fuse.
The KLKR-12 is rated for compatible AC circuits up to 600 VAC and DC circuits up to 300 VDC. These separate voltage ratings support protective-device selection according to circuit type, operating voltage and available prospective short-circuit current.
The KLKR series 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. Available prospective fault current must remain within the applicable interrupting capacity.
The current-limiting design helps reduce heating and magnetic effects associated with short-circuit events. Rejection-style construction helps prevent installation of fuses with insufficient voltage or interrupting ratings when used with compatible Class CC rejection-type fuse holders.
Littelfuse specifies a total clearing I²t of 350 A²s at its 200 kA test condition, power loss of 1.58 W at 100% rated current and 0.83 W at 80% rated current for KLKR012.T. The fuse features a melamine body, nickel-plated bronze end caps and a nominal 10.3 x 38.1 mm cartridge format.
We support online purchase of the Littelfuse KLKR-12 Class CC Fast-Acting Fuse. If you need to make bulk purchases or inquire about other products, please contact our team with your purchase requirements. We can provide information regarding quantity quotations, delivery arrangements and transportation methods. Please verify the exact model, current rating, electrical specifications and required purchase quantity before ordering.
What is the Littelfuse KLKR-12?
The Littelfuse KLKR-12 is a 12 A Class CC fast-acting, current-limiting cartridge fuse in the POWR-GARD KLKR series. It is intended for general-purpose branch circuit protection and compatible industrial equipment requiring fast overload response.
What is the manufacturer catalog number?
The manufacturer catalog number is KLKR012. The product marking is KLKR 12A, and KLKR012.T is the manufacturer's ordering number for a 10-piece pack.
What is the current rating?
The rated current is 12 amperes, equivalent to 12000 milliamperes.
What are the AC and DC voltage ratings?
The KLKR series is rated for 600 VAC and 300 VDC. Select the applicable rating according to the circuit type and operating voltage.
What are the interrupting ratings?
The AC interrupting rating is 200 kA RMS symmetrical, and the DC interrupting rating is 20 kA. Littelfuse identifies the DC interrupting rating as manufacturer self-certified.
Is KLKR-12 fast-acting or time-delay?
KLKR-12 is a fast-acting fuse. The KLDR series has time-delay characteristics, so the two series should not be treated as interchangeable solely because their current ratings match.
Can KLKR-12 replace KLDR-12?
Not automatically. Although both are Class CC fuses rated at 12 A, KLKR is fast-acting while KLDR is time-delay. Replacement suitability depends on circuit design, expected inrush current, overload response and protective-device coordination requirements.
What is the total clearing I²t value?
Littelfuse specifies a total clearing I²t of 350 A²s for KLKR012.T under the manufacturer's 200 kA test condition. This value is specific to the 12 A rating and should not be substituted with data from another KLKR model.
What is the power loss at rated current?
Littelfuse specifies a power loss of 1.58 W at 100% rated current and 0.83 W at 80% rated current for KLKR012.T. These values can help evaluate operating heat dissipation when selecting a compatible fuse holder and designing an electrical panel.
What are the dimensions and construction materials?
The nominal cartridge dimensions are 10.3 mm in diameter and 38.1 mm in length, approximately 0.41 x 1.50 inches. The KLKR series uses a melamine body and nickel-plated bronze end caps. Littelfuse specifies a series weight of 15.42 g for ratings from 1.5 A through 30 A.
Which fuse holders are recommended?
Littelfuse lists the L60030C and LPSC/LFPSC Touch-Safe fuse holder series as accessories. Verify Class CC compatibility, operating voltage and applicable electrical ratings before installation.
Is KLKR-12 UL listed and RoHS compliant?
The KLKR series is UL Listed under file E81895 and CSA Certified under file LR29862. Littelfuse identifies the series as RoHS compliant and provides manufacturer conformity documentation. The DC interrupting rating is separately manufacturer self-certified.
What should be checked before ordering KLKR-12?
Confirm the KLKR-12 or KLKR012 designation, 12 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. KLKR012.T is the manufacturer's 10-piece ordering number; confirm the actual selling quantity separately.
