Next-Level Shock Protection

In commercial kitchens, combining wet environments, and stainless steel equipment, creates a situation where shock can occur.

Electric ranges and other equipment must be movable to meet sanitation standards, requiring plugs. Flexible cords can wear over time, increasing a worker’s risk of electrical shock.

The National Electrical Code (NEC) now requires a ground-fault circuit interrupter (GFCI). The Littelfuse SB5000 Shock Block protects employees from electric shock. It ensures code compliance for 208 V three-phase applications up to 100 A.

Mobile Shock Block - Value Prop

Learn how we have helped national fast-food chains with next-level shock protection, protecting personnel and businesses.

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Our 80 A and 100 A Models Available Now

Shock Block is a personnel protection device designed to meet the requirements for special-purpose GFCIs defined by UL 943C.


How to Meet GFCI requirements for Commercial Kitchens

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Common 208 V Appliances in Commercial Kitchens

Common 208 Volt Appliances


The Littelfuse Shock Block SB5000 offers features that:


Meets GFCI requirements of NEC 210.8 (B) for large electrical equipment in commercial kitchens


Reduces unnecessary tripping by taking advantage of advanced filtering technology


Includes NEMA 4X and IP69K enclosure ratings for all food-preparation environments


The Shock Block SB5000 is available in 32, 60, 80 and 100 amp models


What is the Littelfuse Shock Block?
The Shock Block is available as a Class A Ground-Fault Circuit-Interrupter, Class C and Class D Special-Purpose Ground-Fault Circuit-Interrupter (SPGFCI) and Equipment Ground-Fault Protection Device (EGFPD). The Class A Shock Block is tested and certified to UL 943, while the Class C and D Shock Block is tested and certified to UL 943C. The EGFPD is an equipment protection device that is tested to a combination of both UL 943 and UL 1053. The Littelfuse EGFPDs follow the same inverse time characteristics as GFCIs while also providing adjustability for applications where higher minimum trip levels may be required.
What does the Shock Block do?
The Shock Block detects leakage current and interrupts the circuit significantly reducing or eliminating the shock potential. One key part of the additional safety features mentioned earlier, is that the Shock Block also monitors the ground wire from the unit to the load for continuity. If the wire is broken or becomes loose, the Shock Block will signal an alarm and interrupt power.
What are the differences between the GFCI, SPGFCI, and the EGFPD models?
The EGFPD Shock Block is the same as the GFCI Shock Block and SPGFCI Shock Block models, except that it has variable setpoints (6, 10–100 mA in increments of 10 mA) to provide flexibility. It can provide “let-go” protection for settings below 20 mA and reduce nuisance tripping on systems with a high leakage current by selecting higher setpoints.

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