Personnel Protection
Industrial Shock-Block
SB6000 SERIES
Industrial
Description
Special-Purpose Ground-Fault Circuit Interrupter (GFCI),
Class C and Class D
Enclosed Model*
Open-Chassis Model*
Industrial Shock Block (ISB) is a personnel protection device designed to
meet the new requirements for special-purpose GFCIs defined by UL 943C.
ISB is the first and only permanently connected Class C and Class D GFCI
on the market. Class C GFCIs are intended to be used on systems where the
line-to-line voltage is 480 V or less with a trip level of 20 mA, while Class D
GFCIs are intended to be used on 600 V systems. These improvements to
the standard Class A GFCI (6 mA trip level used on 240 V systems or less)
were made to allow the use of GFCIs in industrial facilities. The ISB includes
an automatic self-test feature and is compliant to the UL1998 Software in
Programmable Components standard.
Equipment Ground-Fault Protective Device (EGFPD)
ISB is also available with adjustable protection settings as an EGFPD. The
EGFPD models can be set to trip at 6 mA or from 10-100 mA in increments
of 10 mA. This offers more flexibility since GFCI devices are not allowed to
have an adjustable trip level.
Rating and Models
ISB (GFCI & EGFPD) is available for voltages from 208 to 600 V with a
maximum full load current of 100 A, and a built-in overcurrent protection
supplied by Littelfuse Class T fuses. The load can be 1-phase (line-to-line) or
3-phase, however, cannot have a neutral. The power system can either be
solidly-grounded or high-resistance grounded.
Operator Interface*
*Patented
Simplified Circuit Diagram
Two options for enclosures are available: UL-recognized open-chassis models
are available for installation in existing electrical enclosures and UL-listed
enclosed models include a NEMA-4X enclosure for stand-alone installations.
A
B
SB-OPI
(Operator
Interface)
Ground Wire (Load-Ground) Monitor
ꢉC
ꢈ
The ISB also monitors the ground wire (load-ground) connection between the
ISB and load. This is a required feature for GFCI devices and is optional for
EGFPD devices. If the connection is broken, the ISB will provide an alarm by
changing the state of the alarm contacts. This monitoring circuit includes an
extra wire (pilot wire) between the ISB and load (since the monitoring current
is low, only a small wire is required). At the load, the pilot wire is connected to
a termination device. The other end of the termination device is connected to
the load ground (typically the enclosure).
ꢇEꢄMIꢆꢀꢇIOꢆ
ꢊEꢋICE
ꢃꢏ
ꢃꢑ
ꢃꢒ
LOAD
*
ꢉ
ꢉ
ꢀꢁꢂIꢃIꢀꢄꢅ
COꢆꢇꢀCꢇ
Features & Benefits
SB6100
FEATURES
BENEFITS
Detects and interrupts to protect people and reduce the
probability of nuisance tripping
EꢆCꢃOꢌEꢊ ꢌꢍꢎꢏꢐꢐ MOꢊEꢃꢌ
UL 943 inverse time trip curve
* ꢓor a sinꢔle-phase loadꢕ ꢖꢗꢘper ꢃꢑ ꢙ ꢃꢒ
ꢙ ꢗse ꢃꢏ ꢙ ꢃꢑ as the inpꢗt terꢘinals
Reduces the risk of ventricular fibrillation for leakage current
of 250 mA and above
Minimum trip time < 20 msec
UL 943C fixed trip level
(GFCI 20 mA)
Personnel protection for systems with leakage current higher
than the standard 6 mA required by UL 943 Class A
Ordering Information
Provides extra safety when a customer is able to operate with a
setting below 20 mA (GFCI) and the settings above 20 mA can
reduce nuisance tripping on systems with high leakage current.
ORDERING
NUMBER
VOLTAGE
(V)
TRIP
LEVEL (mA)
Selectable trip levels
(EGFPD)
UL CATEGORY/CLASS
SB6100-00x-0
SB6100-10x-0
SB6100-20x-0
208
240
480
UL 943C ground monitor/
interrupt
Protects from shock by tripping if continuity of ground wire
between Industrial Shock-Block and load is broken.
UL 943C Class C
Undervoltage, brownout,
chatter detection
Ensures proper operation and prolongs the internal
contactor lifetime
special-purpose GFCI
20
(Fixed)
3 x ClassT, 600V
incoming fuses
The fuses provide overcurrent protection for a 100 A circuit and
a higher short-circuit current rating (SCCR) of 50 kA.
UL 943C Class D
SB6100-30x-0
600
special-purpose GFCI
Internal circuits are conformally coated to protect against
corrosion and moisture, yet still repairable
Conformal coating
SB6100-01x-0
SB6100-11x-0
SB6100-21x-0
SB6100-31x-0
208
240
480
600
Shows unit status, alarm types, percentage of leakage current,
and allows for Test and Reset capabilities
Operator Interface
Auxiliary Contact
Automatic Self-Test
6, 10-100 in UL 943/UL 1053
increments Equipment ground-fault
Provides a normally-open contact for remote indication
of 10
protective device (EGFPD)
All ISB options (revision 01 or higher) include an automatic
self-test feature
Note: x=0 for open-chassis models and 1 for enclosed models
Motor Starter
Allows the user to start and stop the motor from the interface
© 2017 Littelfuse Protection Relays & Controls
Rev: 4-K-061517
Based on Manual Rev. 1-G-042417
© 2017 Littelfuse Protection Relays & Controls
Littelfuse.com/IndustrialShockBlock
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