SB6100-111-0 - SB6100 Series

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Littelfuse Industrial Shock-Block
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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 permanently connected Class C and Class D GFCI on the market. 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. 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 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 load must be 3-phase, however, cannot have a neutral. The power system can either be solidlygrounded 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).

Property (Mouseover for details) Value
Conformally Coated PWB Standard
Dimensions 453.8x 406.2 mmx 223.3 mm
System Frequency (Hz) 60
Full Load Current (A) 100
GF Trip Level (A) 6, 10-100 mA in increments of 10 mA
NEMA Rating NEMA 4X
Relay Contacts One Form A (N.O.)
Relay Contact Operating Mode Fail-safe
System Type Grounded
Supply Voltage (VAC) 240
Warranty (years) 1

pdf icon SB6100 Datasheet

Special Purpose Ground-Fault Circuit Interrupter (GFCI) and Equipment Ground-Fault Protective Device (EGFPD).

pdf icon SB6100 Manual

The SB6100 Industrial Shock-Block is available as a special-purpose ground-fault circuit interrupter (GFCI) or as an equipment ground-fault protective device (EGFPD).

pdf icon Industrial Shock-Block Brochure

The SB6100 Ground-Fault Circuit Interrupter (GFCI) is the only UL listed device that provides personnel protection at 480 V/600 V in industrial settings.

SB6000 Industrial Shock-Block Enclosed CAD

SB6000 Industrial Shock-Block Open Chassis CAD

pdf icon Industrial Shock-Block SB6100 FAQ

SB6100 Industrial Shock-Block Technical FAQ

pdf icon Industrial Shock-Block GFCI WhitePaper

Preventing Electrocutions and Injury with Industrial GFCIs


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