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Compact grey surge protector module with mounting tabs and three wire terminals

SQUARE D

SQUARE D SDSA1175T Surge Protection Device 120V AC 3 Wires

SKU CH-EMEK-2DDB2

Plug-in surge protector installs like a breaker in QO or Homeline load centres and meets UL 1449 Type 2 requirements

  • Product typePower Quality & Distribution
  • Easy installation fits standard breaker slots
  • Protects 120 V AC single-phase circuits
  • Uses two pole spaces in QO or Homeline panels
  • UL 1449 Type 2 listed for US and Canada
  • Meets NEC 285 and CSA 233.1-87 requirements

Surge Protection for Load Centres

The Square D SDSA1175T is a plug-in surge protective device designed for single-phase 120 V AC systems with three wires. It fits into QO or Homeline load centres and NQ panelboards, using two pole spaces for quick installation alongside standard circuit breakers. Electricians and facility managers can add transient voltage suppression without rewiring the panel.

Capacity and Headroom

The unit is UL Listed as a Type 2 SPD to the UL 1449 standard and complies with NEC Article 285, CSA 233.1-87 and CSA C22.2 No. 8-M1986. It provides surge suppression for the connected branch circuits where it is installed. Buyers who need whole-facility protection at the service entrance or higher surge-current ratings will require a different device class.

Thermals Noise and Power Draw

As a passive surge suppressor, the device generates no audible noise and draws negligible steady-state current during normal operation. It dissipates energy only when clamping transient overvoltages, so thermal load on the panel remains minimal. No active cooling or dedicated ventilation is required for the suppressor itself.

How it compares

Measured against everything we stock in Electrical Enclosures & Cabinets, at today’s prices. Recalculated every night.

Price $76.99
Pricier than about 68% of the 1,411 comparable items (median $39.99).

Specifications

Product
Brand nameSQUARE D
Product typePower Quality & Distribution

Questions about this item

Will the SDSA1175T fit in my existing QO or Homeline load centre without rewiring?

It uses two pole spaces and plugs in like a standard breaker, so it fits QO, Homeline or NQ panelboards without rewiring.

How can I confirm the SDSA1175T is protecting my 120 V circuits after installation?

The unit is UL Listed as a Type 2 SPD to UL 1449 and meets NEC Article 285, CSA 233.1-87 and CSA C22.2 No. 8-M1986, providing verified protection once seated.

Does the SDSA1175T package include mounting hardware or do I need to buy a separate kit?

It installs as a plug-in unit using the load centre's own bus stabs; no extra mounting hardware is required.

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