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You are looking at: Circuit Protection / Fuses / Disconnects > Fuses & Fuse Holders > Current Limiting Class CC

Current Limiting Class CC

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Industrial Fuses - Current Limiting Class CC

Class CC fuses are current limiting fuses with rejection tips on the bottoms to prevent them from being used in holders not rated similarly.

A Current-Limiting Fuse meets the following three conditions:

Interrupts all available overcurrents within its interrupt rating.

Within its current limiting range, limits the clearing time at rated voltage to an interval equal to, or less than, the first major or symmetrical current loop duration.

Limits peak let-through current to a value less than the available peak current.

Select the "Technical Info" tab above (or see our catalog) to refer to the fuse selection guide, which includes a general summary of the specifications included for each fuse type.

This selection guide does not include the many variables that can exist for specific situations such as local codes, unusual temperature, or other operating conditions.

When selecting fuses, be sure to comply with any applicable PUBLIC SAFETY standards that apply to Overcurrent Protection Devices (OPD).

HCLR Series - Current Limiting Class CC Fuses

Applications

Best applied for resistive heating and lighting loads.

Features:

Branch circuit rated for 600 VAC
Compact dimensions
Fast-acting design responds quickly to both overload and short-circuit current

Specifications

Fast-Acting

Voltage Rating:

Ampere Rating:

Interrupting Rating:

Current Limiting:

Agency Approvals

HCTR Series - Current Limiting Class CC Fuses

Applications

Ideal as primary protection for control power transformers (such as our CPT Series) or solenoids.

Features:

Branch circuit rated for 600 VAC
Compact dimensions
Time-delay design allows closer sizing for inductive loads such as control transformers and solenoids

Specifications

Time Delay

Voltage Rating:

Ampere Rating:

Interrupting Rating:

Current Limiting:

Agency Approvals

EDCC Series - Current Limiting Class CC Fuses

Applications

Specifically designed for motor protection, provides excellent current limiting capabilities. Use for protection of small horsepower motor circuits or other circuits requiring small dimension, time-delay fuses. Recognized for NEC branch circuit protection and Type 2 coordinated applications for IEC or NEMA motor starters/contactors. For control transformer applications, refer to HCTR series fuses.

Features:

Branch circuit rated for 600 VAC or 300 VDC
Time-delay for motor branch circuit protection
Excellent current-limiting performance
Considered an upgrade for standard �midget� class fuses

Specifications

Time Delay

Voltage Rating:

Ampere Rating:

Interrupting Rating:

Current Limiting:

Agency Approvals

Commonly used terms

I²t (Ampere Squared seconds): A measure of the thermal energy associated with current flow. I²t is equal to (IRMS)² x t, where t is the duration of current flow in seconds.

Clearing I²t: The total I²t passed by a fuse as the fuse clears a fault, with t being equal to the time elapsed from the initiation of the fault to the instant the fault has been cleared.

Melting I²t: The minimum I²t required to melt the fuse element.

Ampere Rating: The continuous current carrying capability of a fuse under defined laboratory conditions. The ampere rating is marked on each fuse.

Available Fault Current: The maximum short-circuit current that can flow in an unprotected circuit.

Breaking Capacity / Interrupting Rating: A fuse must be able to open the circuit under a short circuit condition without endangering its surroundings. The breaking capacity or interrupting rating of a protective device is the maximum available current, at rated voltage, that the device can safely open without rupturing.

Current-Limiting Range: The available fault currents a fuse will clear in less than � cycle, thus limiting the actual magnitude of current flow.

Current Rating: The current rating of a fuse identifies its current-carrying capacity based on a controlled set of test conditions. Each fuse is marked with its current rating.

Element: A calibrated conductor inside a fuse that melts when subjected to excessive current. The element is enclosed by the fuse body and may be surrounded by an arc-quenching medium such as silica sand. The element is sometimes referred to as a link.

Fast-Acting Fuse: This is a fuse with no intentional time-delay designed into the overload range. It is sometimes referred to as a �single-element fuse� or �non-delay fuse.�

Fault Current: Short-circuit current that flows partially or entirely outside the intended normal load current path of a circuit component. Values may be from hundreds to many thousands of amperes.

Ferrule: The cylindrical brass, bronze or copper mounting terminals of fuses with amp ratings up to 60 amperes. The cylindrical terminals at each end of a fuse fit into fuse clips.

Overcurrent: A condition which exists in an electrical circuit when the normal load current is exceeded. Overcurrents take on two separate characteristics-overloads and short circuits.

Time delay fuse: A fuse with a built-in time delay that allows temporary and harmless inrush currents to pass without operating, but is so designed to open on sustained overloads and short circuits.

Voltage rating: A maximum open circuit voltage in which a fuse can be used, yet safely interrupt an overcurrent. Exceeding the voltage rating of a fuse impairs its ability to clear an overload or short circuit safely.

For more details - select the "Products" tab and click on the desired "Item Code", or select the "Technical Info" tab.

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