Littelfuse expands shock‑block GFCI line with SB4000

INDUSTRIAL SAFTEY Littelfuse expands shock‑block GFCI line with SB4000

2026-05-19 From Littelfuse 1 min Reading Time

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MERSEN France SB

Littelfuse, Inc, a developer in smart solutions that enable safe and efficient electrical energy transfer, expands its Industrial Shock Block Series to help protect workers from electrical shock for loads up to 30A. The SB4000 is available for use in single-, split- and three-phase systems as well as 4-wire systems from 208 to 240V.

SB4000 GFCIs provide 6 mA personnel protection, digital filtering to reduce nuisance trips and UL‑compliant self‑test firmware for reliable protection in harsh settings.(Source: Littelfuse) — SB4000 GFCIs provide 6 mA personnel protection, digital filtering to reduce nuisance trips and UL‑compliant self‑test firmware for reliable protection in harsh settings.
(Source: Littelfuse)

SB4000 models equipped with connections for a neutral wire have built-in grounded-neutral protection per the UL 943 standard. The standard enclosure is IP 69K/NEMA 4X and outdoor rated making it suitable for all industrial environments including high temperature washdown used in food production applications. The SB4000 is panel agnostic making it perfect for remodel and retrofit applications in commercial kitchens, HVAC, and residential pool & spa applications. It includes advanced harmonic filtering, an automatic self-test feature, and is compliant to the UL 1998 Software in Programmable Components standard.

“In industrial and OEM environments, where 30-amp circuits power critical equipment, GFCI protection isn’t optional–it’s essential, especially where moisture and heavy-duty equipment intersect,” stated Tim Piemonte, Product Manager at Littelfuse. “The compact, cost-effective Shock Block SB4000 is a frontline defense against electrical hazards instantly disconnecting power in the event of a ground fault, and is a proactive step toward compliance, reliability and most importantly worker safety.”

Mersen will be participating in PCIM 2026, the leading international exhibition for energy management and power electronics technologies. (Source: Mesago Messe Frankfurt GmbH / Arturo Rivas)

Other feature and benefits include:

UL 943 inverse time detection circuit protects people and the probability of nuisance tripping

Fixed 6 mA trip level meets UL 943 GFCI personnel protection requirements

Streamlined design eliminates flying leads and offers flexible positioning for knockouts

Conformally coated circuit boards protect against corrosion and moisture

Quick installation and easy configuration save time and money

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