JDZ-300E Cooper/Bussmann, JDZ-300E Datasheet - Page 2

• Manufacturer Part Number: JDZ-300E
• Description: Fuses JDZ-300E
• Manufacturer: Cooper/Bussmann
• Type: E-rated Fuse for Transformerr
• Series: JDZr

Specifications of JDZ-300E

• Current Rating: 300 Amps
• Voltage Rating: 8.3 KVolts
• Termination Style: Cartridge
• Dimensions: 15.88 mm L
• Product: Medium Voltage Fuse
• Interrupt Rating: 80000 Amps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: JDZ-300E

Worldwide Circuit Protection Solutions
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Cooper Bussmann is a world-leading supplier of medium
voltage fuses. Each product is backed by an efficient
worldwide distribution network with unrivaled service and
technical support. Cooper Bussmann circuit protection
solutions comply with major international standards: ANSI,
BS, DIN, IEC and UL.
Fuse Types
Medium voltage fuses generally fit into two categories –
expulsion fuses and current limiting fuses. The definitions per
ANSI C37.40 are:
Expulsion Fuse: “A vented fuse in which the expulsion effect
of the gases produced by internal arcing, either alone or
aided by other mechanisms results in current interruption.”
Expulsion fuses will limit the duration of an overcurrent
event, but they will not limit the magnitude of fault current.
Cooper Bussmann offers two types of expulsion fuses:
replacement fuse links for fused cutouts and boric acid
fuses.
Current Limiting Fuse: “A fuse unit that, when in its current-
responsive element is melted by a current within the fuse’s
specified current-limiting range, abruptly introduces a high
resistance to reduce current magnitude and duration,
resulting in subsequent current interruption.” A current
limiting fuse will reduce the magnitude a fault current as well
as limit the duration of the overcurrent event when operating
in its current limiting range. Cooper Bussmann offers a broad
range of current limiting fuses for protection of feeders,
transformers and motor circuits designed to ANSI, BS, DIN
and IEC standards.
Medium Voltage Current Limiting Fuses
Current limiting fuses are classified into three categories:
1. Full Range – defined by ANSI C37.40 as “a fuse capable
of interrupting all currents from the maximum rated
interrupting current down to the minimum continuous current
that causes the melting of the fusible element(s), when the
fuse is applied at the maximum ambient temperature
specified by the manufacturer.” It is able to interrupt any
current that will melt its element.
Medium Voltage Fuses
Medium Voltage Fuses
For detailed information, visit the Electrical IEC section at www.cooperbussmann.com
2. General Purpose – defined by ANSI C37.40 as “a fuse
capable of interrupting all currents from the maximum rated
interrupting current down to the current that causes melting
of the fusible element(s) in one hour.” Not all currents fall
within this range. It is possible for the fuse to be exposed to
an overcurrent lower than the value given by the one hour
criteria. In that case, a different overcurrent protection device
would be required to interrupt the overcurrent.
3. Back-up – defined by ANSI C37.40 as “a fuse capable of
interrupting all currents from the maximum interrupting rating
current down to the minimum interrupting current.”
The minimum interrupting current is the lowest current that
the fuse will be able to clear properly. This creates a need to
place a low current interrupting device, such as motor
overloads, in series with the back-up rated fuse.
E- and R-Rated Fuses
In North America, current limiting fuses typically fall into the
category of E-Rated fuses and R-Rated fuses. Cooper
Bussmann also offers a wide range of current limiting fuses
designed to BS, DIN and IEC standards.
E-Rated fuses are used to protect feeder circuits, power
transformers and potential transformers. E-Rated fuses have
defined current response times specified by ANSI C37.46.
E-Rated fuses 100A and below must melt in 300sec at an
rms current within the range of 200% to 240% of the
continuous current rating. E-Rated fuses above 100A must
melt in 600sec at an rms current within the range of 240% to
264% of the continuous current rating of the fuse. Cooper
Bussmann offers a wide variety of full range and general
purpose E-Rated fuses from 2.4kV up to 38kV.
R-Rated fuses are back-up fuses that provide short-circuit
protection for motor circuits. They are applied with MV motor
starters which provide the overload protection for the circuit.
R-Rated fuses also have defined current response times
specified by ANSI C37.46. R-Rated fuses will melt in a range
of 15 – 35sec at a current equal to 100 times the “R” rating.
Cooper Bussmann offers 2.4kV, 5.08kV, 7.2kV and 8.3kV
R-Rated fuses for motor circuit protection.