Description

Special-Purpose Ground-Fault Circuit Interrupter (SPGFCI),

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

DFT harmonic filtering, an automatic self-test feature and

is compliant to the UL 1998 Software in Programmable

Components standard.

Ground-Fault Circuit Interrupter (GFCI), Class A

The Shock Block is available as a 208 V Class A GFCI,

allowing commercial kitchens, construction sites, and other

non-dwelling units with wet areas to meet NEC 210.8(B) for

their three-phase loads up to 60 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.

Ratings and Models

Industrial Shock Block (GFCI & EGFPD) is available for threephase

voltages from 208 to 600 V with a maximum full load

current of either 32 or 60 A. The power system can be either

solidly or high-resistance grounded and the load must be

three phase without a neutral.

The standard enclosure is IP 69K/NEMA 4X and outdoor

rated, suitable for all industrial environments including hightemperature

washdown used in food production. A Class

II, Division 2 option is also available for applications where

explosive dust may be present (future option).

Ground Wire (Load-Ground) Monitor

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 is recommended for Class A GFCI and EGFPD

devices. If the ground-return path 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. 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).