Surge Protection: Product Families
A surge protective device, or SPD, limits short voltage spikes on a power circuit by diverting the surge energy to ground, so downstream equipment sees a lower voltage. Devices are installed at a service entrance, at a distribution panel or next to sensitive equipment, and they are commonly applied in stages.
In North America, SPDs are listed to UL 1449 and classed as Type 1, 2 or 3 by where they connect. Ratings buyers compare include system voltage and configuration, surge current per phase, protection modes and the enclosure. The families listed here come from the manufacturers’ catalog pages, with the ratings each one publishes.
8 product families from 3 manufacturers
Product families
Siemens
TPS3 (integral and wall-mounted; models TPS3 01, 02, 03, 05, 06, 09, 11, 12, 15)
Hardwired surge protective devices built to UL 1449 4th Edition, mounted inside Siemens distribution equipment or on a wall, with Type 2 as standard and Type 1 optional.
- Rated range
- 50 kA to 1000 kA surge current per phase; In = 20 kA on most models
Siemens
TPS3 03
Type 1 SPD shaped for replacing older surge/lightning arrestors.
- Rated range
- Per-phase surge rating varies by model within the family range 50-1000 kA
Siemens
TPS3 L12 / TPS3 L15 (10-mode)
Wall-mounted SPDs adding direct line-to-line protection elements for ten protection modes, aimed at critical facilities.
- Rated range
- 150 to 900 kA per phase (150/300/450/600/900 kA)
Siemens
FirstSurge (residential)
Residential SPDs covering power, telephone and cable-TV lines.
- Rated range
- 60, 100 or 140 kA per phase
Schneider Electric (Square D)
Surgelogic EMA
Listed as current
UL 1449 Type 1 SPD in a NEMA 1 steel enclosure for service entrance, distribution and critical branch panels, indoor use.
- Rated range
- Ratings not stated
Schneider Electric (Square D)
Surgelogic SPDE
Listed as current
Compact NEMA 4X SPD for indoor or outdoor mounting (bracket, DIN rail or nipple), fitted in meter centers or other equipment.
- Rated range
- 50 kA per phase
Schneider Electric (Square D)
Surgelogic SDSA
Listed as current
Small single- and three-phase SPDs installed next to panels or on equipment, useful as a downstream stage in cascaded protection.
- Rated range
- Ratings not stated
Leviton
51120 series (51120-1 single-phase 120/240 V, 51120-3 three-phase 120/208 V)
Branch-panel-mounted hardwired SPDs in a J-box enclosure with status LEDs, for residential and small commercial panels.
- Rated range
- 51120-3: 120/208 V 3-phase wye, 50 kA per mode, UL 1449 4th Ed. Type 2
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Tell us the manufacturer, series and rating, or the part number, and ask for a quote. The entries on this page are a reference list, not a stock or price list.
Ratings and lifecycle notes come from the manufacturer pages linked on each entry.
Manufacturer and product names are trademarks of their respective owners and are used only to identify equipment.