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Pick your voltage and system (WYE, Delta, split-phase) and get an engineer-vetted UL 1449 Type 1 recommendation—with clear L-N vs L-L guidance.
Follow these four quick steps to get the right SPD for your application:
Select your voltage, system type (Wye, Delta, split-phase), and any signal lines.
Choose the recommended surge protection device for your application and protection level.
Click the item number to view full specs, drawings, and documentation in the eShop.
Save, share, or request a quote from our team or your distributor.
A quick look at the layout you'll use
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Use the Split-phase row. Select 120 V (L–N) for branch circuits or 240 V (L–L) for 2-pole loads. The selector maps to the correct surge protector device.
Use WYE (with neutral). Choose 120 V (L–N) for branch circuits or 208 V (L–L) for 3-phase loads. The selector maps to the correct surge protector device.
Use WYE (with neutral). Pick 277 V (L–N) for branch circuits or 480 V (L–L) for 3-phase loads. The selector maps to the correct surge protector device.
Go from system and voltage (split-phase, Wye, Delta) to a recommended model in minutes—with clear L-N vs L-L guidance.
Click the item number for datasheets, drawings, certifications, and ordering info—easy to share for BOMs and submittals or with your distributor.
UL 1449 Type 1 devices suitable for service-entrance or downstream panels; our U.S. team can review SCCR, lead length, and OCPD details to confirm fit.
Yes—US series SPDs are UL 1449 Type 1, so they can be installed on the line side at service equipment or on the load side (downstream panels). If you’re unsure about placement, we’ll validate.
Use the matching grid row; for high-leg delta or corner-grounded services, include a note and we’ll confirm wiring mode and device choice.
Many U.S. models allow fuseless connection within stated limits—always follow the device datasheet and your panel’s SCCR. Keep leads as short as practical to minimize let-through. We’ll verify the connection method for your SKU.