SL3-125 Application Guide

Step 1 : SPD Product Selection Guide

Step 2 : Project-Specific Surge Current Selection Chart

Step 3 : Application Guide

Service Entrance Section (SES), Main Panel

Product Application

Surge Current Rating: 125 kA/Mode (250 kA/Phase)

Connection Information

Surge Current Rating
(per Mode)		VoltageConfigurationProduct NumberData SheetCircuit
Breaker		Conductor Size
(Phase, Neutral
and Ground)
125 kA480Y/277 V
208Y/120 V
120/240 V		3-Phase, 4-Wire Wye
3-Phase, 4-Wire Wye
Single/Split Phase		SL31254803YMDTM4F
SL31252083YMDTM4F
SL31252402GMDTM4F		PDF100A#2 AWG
Click on the “PDF” nomenclature (above) for the product data sheet.

The product numbers (above) are shown for the identified voltage configurations, include an integral disconnect switch and the M4 monitoring system. For other configurations of the SL3-125, see and click on the “Product Number Configuration Guide” and the “Monitoring System Selection Guide” (below).

For book specification, CLICK HERE. For sheet note spec, CLICK HERE.

Application Guide for SL3-125 Series SPDs

Surge and Temporary Overvoltage Protection (STOP) SPD

Line Side of the Main Breaker (Direct Bus Connection)

Load Side of the Main Breaker (Connection Thru a Breaker)

No CB Available or 6-Throw Rule (Direct Bus Connection)

Product Number Configuration Guide

Monitoring System Selection Guide

For other SL3 series product information, CLICK HERE.