Personnel Protection
Industrial Shock Block
SB6000 Series
Description
Special-Purpose Ground-Fault Circuit Interrupter (GFCI),
Class C and Class D
Industrial Shock Block (ISB) is a personnel protection device designed to meet
the requirements for special-purpose GFCIs defined by UL 943C. This standard
outlines GFCI classes specifically designed for use in industrial facilities. Class
C GFCIs are intended to be used on three-phase 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. The Industrial Shock Block includes
an automatic self-test feature and is compliant to the UL 1998 Software in
Programmable Components standard.
Enclosed Model*
Open-Chassis Model*
Ground-Fault Circuit Interrupter (GFCI), Class A
The Shock Block is available as a Class A GFCI, allowing commercial kitchens,
construction sites, and other non-dwelling units with wet areas to meet NEC
210.8(B) for their 3-phase loads up to 100 A.
Equipment Ground-Fault Protective Device (EGFPD)
Industrial Shock Block 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
Industrial Shock Block (GFCI & EGFPD) is available for three-phase 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 power system
can be either solidly or high-resistance grounded and the load must be three
phase without a neutral.
*Patented
Operator Interface*
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.
Simplified Circuit Diagram
Ground Wire (Load-Ground) Monitor
SB-OPI
(Operator
Interface)
The Industrial Shock Block also monitors the ground wire (load-ground)
connection between the Industrial Shock Block and load. This is a required
feature for Class C and D GFCI devices and and is recommended for Class A
GFCI and EGFPD devices. If the connection is broken, the Industrial Shock
Block will trip and provide an alarm by changing the state of the alarm contacts.
This monitoring circuit includes an extra wire (pilot wire) between the Industrial
Shock Block 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).
A
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Features & Benefits
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FEATURES
BENEFITS
SB6100
Detects and interrupts to protect people and reduce
the probability of nuisance tripping
UL 943 inverse time trip curve
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Reduces the risk of ventricular fibrillation for leakage
current of 250 mA and above
Minimum trip time < 20 msec
Ordering Information
Fixed 6 mA (UL 943) or 20 mA Personnel protection for industrial and commercial
(UL 943C) trip level
systems on loads up to 100 A
ORDERING
NUMBER
VOLTAGE
(V)
TRIP
UL CATEGORY/CLASS
LEVEL (mA)
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
Protects from shock by tripping if continuity of ground
wire between Industrial Shock Block and load is broken
Selectable trip levels
(EGFPD)
SB6100-00x-0
SB6100-10x-0
SB6100-20x-0
208
240
480
UL 943C Class C
special-purpose GFCI
20
UL 943C ground monitor/
interrupt
(Fixed)
Undervoltage, brownout,
chatter detection
Ensures proper operation and prolongs the internal
contactor lifetime
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
3 x ClassT, 600V
incoming fuses
SB6100-01x-0
SB6100-11x-0
SB6100-21x-0
SB6100-31x-0
208
240
480
600
6, 10-100 in UL 943/UL 1053 Equipment
increments ground-fault protective
Internal circuits are conformally coated to protect against
corrosion and moisture
Conformal coating
Operator Interface
of 10
device (EGFPD)
Shows unit status, alarm types, percentage of leakage
current, and allows for Test and Reset capabilities
Auxiliary Contact
Provides a normally-open contact for remote indication
All units include an automatic self-test feature
6
Automatic Self-Test
SB6100-02x-0
208
UL 943 Class A GFCI
(Fixed)
Allows the user to start and stop the motor from the
interface
Motor Starter
Note: x=0 for open-chassis models and 1 for enclosed models
Littelfuse.com/IndustrialShockBlock
© 2020 Littelfuse, Inc.
Rev: 081320
Based on Manual Rev. 1-I-071520
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