Brochure
Table Of Contents
- Dual element time-delay class RK5 fuses
- Class RK5 selection guide
- Class RK5 time-current curves
- Class RK5 peak let-through current curves
- General selection guide
- Modular ferrule fuse blocks for class R fuses
- Modular ferrule fuse blocks for class R fuses dimensions
- Edison fuse blocks for class RK fuses
- Edison fuse accessories
- Edison cross reference guide
CROSS REFERENCE
VOLTS EDISON BUSSMANN
MERS-
EN GOULD
LITTELFUSE
250
ECNR FRN-R TR FLNR
600
ECSR FRS-R TRS FLSR
Dual Element Time-Delay
Class RK5 Fuses
ECNR40
ECNR70
ECNR150
ECSR5 ECSR200
ECSR100
These fuses are recommended for AC pow-
er distribution system mains, feeders and
branch circuits having inductive loads (mo-
tors, transformers) or non-inductive loads
(lighting, heating) where the available short-
circuit current does not exceed 200,000
RMS symmetrical amperes. These dual el-
ement, time-delay fuses have minimum in-
dustry 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 am-
pacity 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 economi-
cal for most applications, especially motors
and transformers. They have moderate cur-
rent limitation.
ECNR/ECSR
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
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
ECNR/ECSR
Specifications
Voltage Rating:
ECNR: 250 VAC
ECSR: 600 VAC
Ampere Rating:
ECNR: 1–600 Amps
ECSR: 3–600 Amps
Interrupting Rating:
200,000 RMS Symmetrical Amps
Self-Certified DC Ratings:
• Voltage Rating:
ECNR (1–200): 125 VDC
ECNR (201–600): 250 VDC
ECSR (3–600): 300 VDC
• Self-Certified Interrupting Rating:
ECNR/ECSR 20,000 Amperes DC
Current Limiting: RK5 Fuse
Agency Approvals
• UL Listed, Class RK5, Guide JDDZ,
File E162363
• CSA Certified HRCI-R per C22.2, No.
248.12
1-800-633-0405
Circuit Protection
tCPR-149
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