Single-Phase SPDs

Single-phase surge protective devices (SPDs) provide NEC-required protection against transient voltage surges from lightning strikes, current switching, start up, shut down, and power surges. Littelfuse makes three models of Type 1 and Type 2 single-phase SPDs that, respectively, use metal oxide varistors (MOVs), gas discharge tubes (GDTs), or MOVs, TVS diodes, and fuses to handle excess voltage.

Block Diagram

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Technology:
Product Series:LVSP
Features:Complements Littelfuse MOVs and AK TVS diodes
Benefits:Designed to survive surges caused by lightning as described in IEC and UL standards

Technology:
Product Series:TMOV, LST
Features:Normally open and normally closed options for remote indication
Benefits:Same footprint for 50 kA and 75 kA Imax for same PCB layout (LST)

Technology:
Product Series:CG3
Features:Rugged ceramic-metal construction
Benefits:Surge protection for AC lines

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