HSD240V Whole House Surge Protector (120/240V Split-Phase, 260kA, ETL Listed)

HSD240V Whole House Surge Protector for 120/240V Split-Phase Systems

Protect your home’s electrical system and connected equipment with the HSD240V whole house surge protector from Bad Wolf. Designed for 120/240V split-phase electrical systems, the HSD240V helps defend against damaging surges caused by lightning, utility switching, grid disturbances, and other transient overvoltage events.

Built for demanding residential and light commercial applications, the HSD240V provides 260kA surge current capacity, 100kA SCCR, and 6 modes of protection to help shield electrical panels, HVAC systems, appliances, smart home devices, garage equipment, and other sensitive electronics from damaging voltage spikes.

EM-Rated Protection for EMP, CME, and Solar Flare Events
The HSD240V is designed as an EM-rated whole house surge protector to help reduce damaging surge energy associated with electromagnetic pulse (EMP), coronal mass ejection (CME), and solar flare-related electrical disturbances. Scientific and infrastructure guidance shows that electromagnetic and geomagnetic events can induce damaging voltages and currents in conductors and power systems, making service-entrance surge protection an important part of a broader electrical resilience strategy. For customers looking for added defense against surge-related effects associated with EMP, CME, and solar flare-driven electrical disturbances. Research on electromagnetic pulse and space weather shows that fast electromagnetic events can couple into conductors and cables, creating damaging voltage and current surges, while geomagnetic storms driven by Earth-directed CMEs can induce unwanted currents in long conductors and electrical infrastructure. An EMP’s E2 component is often discussed in relation to lightning-like surge behavior, and its E3 component is described as similar to geomagnetic disturbance effects on power systems.

For that reason, the HSD240V can be described as helping provide an additional layer of protection at the service entrance by limiting surge energy before it reaches connected equipment. CISA resilient-power guidance specifically recommends EMP-rated surge protective devices on AC power lines and cables as part of broader protection planning.

While no single surge protector should be presented as a guarantee against every possible direct EMP or severe grid event, the HSD240V is designed to help reduce damaging transient energy on incoming power lines and support a more resilient electrical protection strategy. That makes it a strong choice for homeowners and facility operators who want enhanced protection against lightning, utility surges, electromagnetic disturbances, and space-weather-related electrical events.

Electrical Specifications

• System Voltage: 120/240V AC Split-Phase

• Frequency: 50/60 Hz

• Surge Current Capacity: 260kA

• Short Circuit Current Rating (SCCR): 100kA

• Modes of Protection: 6

  • L1-L2

  • L1-N

  • L2-N

  • L1-G

  • L2-G

  • N-G

• Maximum Continuous Operating Voltage (MCOV):

  • 300V Line-to-Line

  • 150V Line-to-Ground

• Voltage Protection Rating (VPR):

  • 1000V Line-to-Line

  • 500V Line-to-Ground

• Connection Leads: 36-inch wire leads

• Enclosure Rating: NEMA 4X / IP67

• Installation Location: Indoor or Outdoor

Certifications and Compliance

ETL Listed to UL 1449 5th Edition and CSA C22.2 No. 269.1 / 269.2, with additional testing to FCC 47 CFR Part 15: 2024 and ICES-003: 2020.