Littelfuse CCMR040 CCMR Series...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$131.19
Littelfuse CCMR040 CCMR Series Class CC Time-Delay Fuse, 40A

Littelfuse CCMR040 CCMR Series Class CC Time-Delay Fuse, 40A

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Model: CCMR040

In Stock (leaves warehouse same day if ordered before 3pm ET)

$131.19
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Littelfuse CCMR040 CCMR Series Class CC Time-Delay Fuse, 40A

The Littelfuse CCMR Series is a Class CC dual-element, time-delay fuse engineered specifically for motor branch circuit protection, rated 40A at 600VAC and 250VDC. This fuse delivers Type II protection (no damage) to both NEMA-rated and the more sensitive IEC motor circuit components, combining a compact Class CD package size with a 200,000 ampere interrupting rating (A.I.R.) for dependable performance under high fault-current conditions. As a true dual-element time-delay CC fuse, it is purpose-built where both reliable overload protection and fast-acting short-circuit protection are required in a single device.

Key Features

  • Ampere Rating: 40A, rated for use on circuits up to 600VAC and 250VDC.
  • Class CC Dual-Element Design: Compared to other UL Listed fuses, Class CC dual-element fuses are the most current-limiting, rating for rating, and are engineered specifically for motor branch circuit protection.
  • Type II Protection: Provides no-damage protection to both NEMA-rated and IEC motor circuit components.
  • 200,000 A.I.R.: Reliable interruption of all overcurrents up to 200,000 amperes.
  • Time-Delay Opening: Slo-Blo/Time Lag (T)/Time Delay characteristic suited to handle motor inrush current without nuisance opening.
  • Space-Saving Package: Class CD package size provides superior protection in a fraction of the space of other fuse classes; replacing 600V three-pole 30A Class R fuse blocks with Class CC fuse blocks reduces panel-mounting space by approximately 70%.
  • Extremely Current Limiting: Reduces damage caused by heating and magnetic effects of short-circuit currents, stopping damaging short-circuit faults faster than any mechanical protective device.

Certifications & Compliance

  • UL Listed
  • RoHS Compliance Documentation Available

Technical Specifications

  • VAC (V): 600
  • VDC (V): 250
  • Ampere Rating (A): 40

Typical Applications

  • Motor Branch Circuit Protection
  • NEMA-Rated and IEC Motor Control Circuits
  • Panelboard and Motor Control Center Installations
  • Industrial and Commercial Electrical Systems
  • Space-Constrained Panel Retrofits and Upgrades

Why Littelfuse?

Littelfuse CCMR Series fuses are purpose-built for demanding motor circuit protection, combining true dual-element time-delay operation with a 200,000 A.I.R. interrupting rating in a compact Class CD footprint. For electricians and panel builders who need code-compliant, current-limiting overcurrent protection without sacrificing panel space, the CCMR Series delivers dependable, UL Listed performance backed by Littelfuse engineering.

Product Specs

Product Type:
Time-Delay Fuse
Voltage Rating:
600VAC
Amperage Rating:
40A
Series:
CCMR
Listing:
UL Listed
Department:
Electrical
Product Group:
Circuit Protection
Product Subgroup:
Fuses

Littelfuse CCMR040 – Frequently Asked Questions

1) Will a Littelfuse CCMR040 hold on motor inrush without nuisance blowing?
That is what the CCMR is built for. It is a true dual-element, time-delay (Slo-Blo / Time Lag) Class CC fuse rated 40A, so it rides through motor starting current while still clearing short circuits fast. Littelfuse rates it for Type II (no damage) protection of both NEMA-rated and the more sensitive IEC motor circuit components.
2) What interrupting rating does this Class CC fuse have for a high fault-current panel?
200,000 amperes A.I.R. at its rated voltage, so the CCMR040 will clear any overcurrent up to 200kA. It is also extremely current limiting, which cuts the thermal and magnetic damage a short circuit puts into downstream starters and conductors.
3) Will a CCMR fuse fit my existing Class R fuse block?
No. The CCMR is a Class CC fuse in the compact Class CD package, with the rejection feature that goes with Class CC holders and blocks. It will not drop into a Class R block. Going the other way, swapping 600V three-pole 30A Class R blocks for Class CC blocks cuts panel mounting space by roughly 70 percent, which is the usual reason people make the change on a retrofit.
4) Should I use a time-delay Class CC fuse or a fast-acting Class RK1 for a motor circuit?
For a motor branch circuit you want the time-delay element. The CCMR040 is dual-element time-delay, so it tolerates locked-rotor and inrush current. Fast-acting fuses like the Mersen A2K Series or the A6K-R Series Class RK1 are built for circuits without inrush, such as feeders and non-motor loads, and will tend to open on a motor start. If you need a time-delay fuse in the larger Class RK1 case rather than Class CC, the Mersen A2D-R with SmartSpot blown-fuse indication is the time-delay RK1 option.
5) Can a Mersen A2K-R fuse be used in place of a Littelfuse CCMR040 for motor branch circuit protection?
No — they are different fuse classes with different bodies and different opening characteristics. The Littelfuse CCMR040 is a Class CC dual-element time-delay fuse rated 40A at 600VAC, built to ride through motor inrush without nuisance opening. The Mersen A2K series is a fast-acting Class RK1 fuse rated 250V, so it has no time-delay element to absorb starting current and its voltage rating is lower. A Class CC fuse also mounts in a Class CC block or holder, which will not accept a Class R ferrule or knife-blade fuse. If a motor circuit is wired for Class R, it needs a time-delay Class R fuse, not a CC.
6) What is the closest time-delay alternative if a panel is already set up for Class R fuse blocks instead of Class CC?
The Mersen A2D-R is a Class RK1 time-delay fuse with SmartSpot blown-fuse indication, so it keeps the time-delay characteristic a motor circuit needs while fitting Class R rejection mountings. The Littelfuse CCMR040 is a Class CC dual-element time-delay fuse rated 40A at 600VAC in the compact Class CD package, which requires a Class CC block. Choose based on the mounting already in the enclosure — the Class CC route saves panel space, the Class R route reuses existing blocks and adds a visual blown indicator.
7) Is the Littelfuse CCMR040 UL Listed for code-compliant branch circuit protection?
It is UL Listed, and RoHS compliance documentation is available. Class CC dual-element fuses are, rating for rating, the most current-limiting UL Listed fuse type, which is why they are specified for motor branch circuit protection in panelboards and motor control centers.
8) What is the exact part number to order for the 40 amp CCMR fuse?
Littelfuse CCMR040 is the manufacturer part number for the 40A rating in the CCMR Series. The amp rating is the last three digits of the designation, so a panel standardized on CCMR fuses is ordered by changing those digits per circuit.
9) Can a Mersen Amp-Trap E-rated fuse be substituted for a Littelfuse CCMR040?
No. The Mersen A055F1D0R0-150E is a D0R0 series E-rated medium voltage fuse with ferrule terminals, used in medium voltage transformer and feeder applications. The Littelfuse CCMR040 is a 600VAC/250VDC low voltage Class CC fuse for motor branch circuits. The two serve entirely different system voltages and are not alternatives for one another in any installation.
10) Is the Mersen A2K12R an equivalent to the Littelfuse CCMR040?
No. The Mersen A2K12R belongs to the A6K-R series and is a fast-acting Class RK1 fuse, intended where no inrush allowance is wanted. The Littelfuse CCMR040 is a Class CC dual-element time-delay fuse, 40A at 600VAC, with a 200,000 ampere interrupting rating for motor branch circuits. Different class, different mounting, and different opening curve — they are not interchangeable in the same holder or on the same motor starter.
11) Would a Square D PowerLogic meter fuse pack work for protecting a small motor circuit?
No. The Square D PowerLogic Energy Meter Fuse Pack is a set of three 0.5A 600V fuses intended for the voltage-sensing leads of a metering device, not for load current. For a motor branch circuit, the Littelfuse CCMR040 Class CC dual-element time-delay fuse at 40A/600VAC is the right category of device, since it carries motor inrush and provides Type II no-damage protection to NEMA and IEC motor circuit components.
12) Can I use the CCMR040 to protect a metering or control transformer circuit?
It is sized and characterized for motor branch circuits at 40A, which is far above what instrument and metering circuits need. For energy meter protection, a small fast-acting set like the Square D PowerLogic fuse pack, 0.5A at 600V in sets of three, is the correct scale of device.
How fast can I get the Littelfuse CCMR040 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Littelfuse CCMR040 come with a warranty?
Absolutely. The Littelfuse CCMR040 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Littelfuse CCMR040?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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