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Industrial Fuses - Current Limiting Class RK5

These fuses are recommended for AC power distribution system mains, feeders and branch circuits having inductive loads (motors, transformers) or non-inductive loads (lighting, heating) where the available short-circuit current does not exceed 200,000 RMS symmetrical amperes. These dual element, time-delay fuses have minimum industry standard time-delay of 10 seconds at 5 times the fuse rating (8 sec. minimum for 250V, 30A and less). The time-delay characteristics of these fuses typically allows them to be sized closer to the running ampacity of inductive loads to reduce cost and provide improved overcurrent protection. These fuses will override normal equipment current surges to reduce unnecessary fuse openings. They are the most popular fuses used in the industry and the most economical for most applications, especially motors and transformers. They have moderate current limitation.

Current ratings up to 600 amps on class RK5 current limiting fuses!

A Current-Limiting Fuse meets the following three conditions:

1. Interrupts all available overcurrents within its interrupt rating.



2. 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.



3. 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).

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ECNR Series - Class RK5 Dual Element Time Delay Fuses Applications Recommended for AC power distribution system mains, feeders, and branch circuits Protection of motors and motor branch circuits Protection of transformers and other inductive loads All general-purpose applications including lighting, heating and other non-inductive loads Features: True dual - element construction allows sizing of 125% FLA for motor backup protection Superior overload and cycling capabilities Current limiting; provides component short circuit protection Specifications Time Delay Voltage Rating: ECNR - 250 VAC Ampere Rating: 1 - 600 Amps Interrupting Rating: 200,000 RMS Symmetrical Amps Current Limiting: RK5 Fuse Self-Certified DC Ratings: - Voltage Rating: ECNR (.1-600) 125 VDC - Self-Certified Interrupting Rating: ECNR 20,000 Amperes DC Agency Approvals UL Listed, Class RK5, Guide JDDZ, File E162363 CSA Certified HRCI-R per C22.2, No. 248.12

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ECSR Series - Class RK5 Dual Element Time Delay Fuses Applications Recommended for AC power distribution system mains, feeders, and branch circuits Protection of motors and motor branch circuits Protection of transformers and other inductive loads All general-purpose applications including lighting, heating and other non-inductive loads Features: True dual - element construction allows sizing of 125% FLA for motor backup protection Superior overload and cycling capabilities Current limiting; provides component short circuit protection Specifications Time Delay Voltage Rating: ECSR - 600 VAC Ampere Rating: 3 - 600 Amps Interrupting Rating: 200,000 RMS Symmetrical Amps Current Limiting: RK5 Fuse Self-Certified DC Ratings: - Voltage Rating: ECSR (.1-600) 300 VDC - Self-Certified Interrupting Rating: ECSR 20,000 Amperes DC Agency Approvals UL Listed, Class RK5, Guide JDDZ, File E162363 CSA Certified HRCI-R per C22.2, No. 248.12

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