© 2017 Littelfuse Protection Relays & Controls

Personnel Protection

ORDERING

NUMBER

VOLTAGE

(V)

TRIP

LEVEL (mA) UL CATEGORY/CLASS

SB6100-00x-0

208

20

(Fixed)

UL 943C Class C

special-purpose GFCI

SB6100-10x-0

240

SB6100-20x-0

480

SB6100-30x-0

600

UL 943C Class D

special-purpose GFCI

SB6100-01x-0

208

6, 10-100 in

increments

of 10

UL 943/UL 1053

Equipment ground-fault

protective device (EGFPD)

SB6100-11x-0

240

SB6100-21x-0

480

SB6100-31x-0

600

Ordering Information

FEATURES

BENEFITS

UL 943 inverse time trip curve

Detects and interrupts to protect people and reduce the

probability of nuisance tripping

Minimum trip time < 20 msec

Reduces the risk of ventricular fibrillation for leakage current

of 250 mA and above

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

Selectable trip levels

(EGFPD)

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.

UL 943C ground monitor/

interrupt

Protects from shock by tripping if continuity of ground wire

between Industrial Shock-Block and load is broken.

Undervoltage, brownout,

chatter detection

Ensures proper operation and prolongs the internal

contactor lifetime

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.

Conformal coating

Internal circuits are conformally coated to protect against

corrosion and moisture, yet still repairable

Operator Interface

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

Automatic Self-Test

All ISB options (revision 01 or higher) include an automatic

self-test feature

Motor Starter

Allows the user to start and stop the motor from the interface

Features & Benefits

Simplified Circuit Diagram

Industrial

AUXILIARY

CONTACT

K

LOAD

SB-OPI

(Operator

Interface)

G

TERMINATION

DEVICE

ENCLOSED SB6100 MODELS

G

L1

L2

L3

SB6100

*

GC

A

B

Note: x=0 for open-chassis models and 1 for enclosed models

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 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.

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.

Ground Wire (Load-Ground) Monitor

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).

© 2017 Littelfuse Protection Relays & Controls

Littelfuse.com/IndustrialShockBlock

*Patented

Rev: 4-K-061517

Based on Manual Rev. 1-G-042417

SB6000 SERIES

Industrial Shock-Block

Open-Chassis Model*

Enclosed Model*

Operator Interface*