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Bad Wolf
Bad Wolf Surge Protection Devices

Surge Protectors

Browse Bad Wolf AC and DC surge protection devices by voltage, electrical system, and surge current rating. Our products are designed for residential, commercial, industrial, marine, vehicle, battery, and equipment protection applications.

View AC Surge Protectors View DC Surge Protectors
Need help choosing? Match the SPD to your system voltage first, then compare surge current rating and connection style.
Browse by Specification

Choose by Voltage & System

Select the AC or DC voltage group that matches your electrical system. Each section below will show matching Bad Wolf surge protectors organized by voltage, system type, and surge current rating.

AC Surge Protectors

For AC power systems including split-phase, single-phase, low-voltage control circuits, and three-phase systems.

120V AC 120/240V Split Phase 24VAC Control Circuits 208Y/120V 3-Phase Wye 480Y/277V 3-Phase Wye 240V Delta 480V Delta

DC Surge Protectors

For DC battery, vehicle, marine, off-grid, solar, MC4, equipment, NMEA 2000, and specialty DC systems.

12V DC 24V–76.8V DC MAXDC High-Voltage DC MC4 DC Surge Protectors NMEA 2000 / Marine DC

Browse by Surge Current Rating

Quickly compare products by nominal surge current capacity. Product ratings vary by model and configuration.

50kA 65kA–100kA 200kA+ High-Capacity SPDs
AC Surge Protectors

AC Surge Protection Devices

Bad Wolf AC surge protection devices are organized below by voltage and electrical system. Start with the system voltage, then compare surge current rating, SPD type, and connection style.

120/240V Split Phase

120/240V Split-Phase AC Surge Protectors

For 120/240V split-phase electrical systems commonly used in residential, light commercial, HVAC, generator, farm, irrigation, RV, solar, wind, and equipment protection applications.

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50kA AC

SP240V50KA

120/240V Split-Phase Type 1 SPD

  • 50kA surge current rating
  • 120/240V split-phase systems
  • Compact hardwired protection
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65kA AC

SP240V65KA

120/240V Split-Phase Type 1 SPD

  • 65kA surge current rating
  • Good standard protection level
  • For split-phase AC systems
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100kA AC

SP240V100KA-A

120/240V Split-Phase Type 1 SPD

  • 100kA surge current rating
  • 6-mode protection
  • Cable gland / flush mount style
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100kA AC

SP240V100KA-B

120/240V Split-Phase Type 1 SPD

  • 100kA surge current rating
  • 6-mode protection
  • Includes 1/2" liquid-tight fitting
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200kA AC

SP240V200KA

120/240V Split-Phase Type 1 SPD

  • 200kA surge current rating
  • Heavy-duty split-phase protection
  • For higher exposure installations
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225kA AC

SP240V225KA

120/240V Split-Phase SPD with EMP Protection

  • 225kA surge current rating
  • Split-phase AC protection
  • EMP protection product family
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260kA AC

HSD240V

Home Surge Defender 240VAC

  • 260kA surge current rating
  • 120/240V split-phase systems
  • High-capacity AC protection
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400kA AC

SP240V400KA

NextGen 400kA Split-Phase SPD

  • 400kA surge current rating
  • 120/240V split-phase systems
  • Extreme-duty protection level
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520kA AC

PHSD240V

Pro Home Surge Defender 240VAC

  • 520kA surge current rating
  • 120/240V split-phase systems
  • Highest-capacity split-phase option
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120V AC

120V AC Surge Protectors

For 120V AC applications including shore power, generator, RV, portable power, equipment, and point-of-use surge protection. Products are grouped here by voltage and surge current rating.

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80kA AC

SP120V80KAL530

120V 30A L5-30 Shore Power Surge Protector

  • 80kA surge current rating
  • 120V 30 amp applications
  • L5-30 shore power / generator style protection
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110kA AC

SP120V110KAL30

120V 30A Shore Power Surge Protector

  • 110kA surge current rating
  • 120V 30 amp applications
  • Shore power, generator, and equipment protection
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110kA AC

SP120V110KARV

120V 30A RV Surge Protector

  • 110kA surge current rating
  • 120V 30 amp RV applications
  • RV, shore power, and portable power protection
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120VAC AC

PSP120V

Portable Surge Protector 120VAC

  • 120VAC portable surge protection
  • Point-of-use / portable power applications
  • Compact 120V AC protection option
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120VAC AC

SSP120V

Spot Surge Protector 120VAC

  • 120VAC spot surge protection
  • Equipment and point-of-use applications
  • Compact 120V AC protection option
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24VAC Control Circuits

24VAC Control Circuit Surge Protectors

For 24VAC low-voltage control circuits commonly used with HVAC thermostats, control boards, air handlers, condensers, relays, and other low-voltage equipment circuits.

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24VAC AC

SP24AA

24VAC Low-Voltage Surge Protector

  • Designed for 24VAC control circuits
  • Helps protect thermostats and control boards
  • Useful for HVAC and low-voltage equipment wiring
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24VAC AC

SP24A24AA

Dual 24VAC Low-Voltage Surge Protector

  • Designed for two 24VAC control circuit pairs
  • Helps protect thermostats, control boards, and controls
  • Good option when multiple 24VAC circuits need protection
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Installer note: These products are for low-voltage 24VAC control wiring. For line-voltage HVAC equipment protection, use the correct AC SPD for the equipment voltage, such as a 120/240V split-phase SPD for many residential condenser applications.
Three-Phase AC

Three-Phase AC Surge Protectors

For commercial and industrial three-phase AC electrical systems. Select the model that matches the system voltage and configuration, including wye or delta systems.

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208Y/120V AC

SP3P208VY

208Y/120V Three-Phase Wye Surge Protector

  • For 208Y/120V 3-phase wye systems
  • Commercial and light industrial applications
  • Panel and equipment surge protection
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480Y/277V AC

SP3P480VY

480Y/277V Three-Phase Wye Surge Protector

  • For 480Y/277V 3-phase wye systems
  • Commercial and industrial applications
  • Panel and equipment surge protection
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240V Delta AC

3POD240V

240V Three-Phase Delta Surge Protector

  • For 240V 3-phase delta systems
  • Commercial and industrial equipment protection
  • Designed for delta electrical configurations
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480V Delta AC

3PD480V

480V Three-Phase Delta Surge Protector

  • For 480V 3-phase delta systems
  • Industrial panel and equipment protection
  • Designed for delta electrical configurations
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Selection note: Three-phase surge protectors must be matched to the correct electrical system. Confirm whether the installation is wye or delta, and verify the system voltage before selecting a model.
DC Surge Protectors

DC Surge Protection Devices

Bad Wolf DC surge protection devices are organized below by DC voltage and product type. Start with the system voltage, then compare surge current rating, connection style, and application requirements.

12V DC

12V DC Surge Protectors

For 12V DC battery, vehicle, equipment, off-grid, emergency power, MC4, and specialty low-voltage DC systems. Marine NMEA 2000 products are listed separately in the NMEA 2000 / Marine DC section.

Back to DC Section
12V DC DC

MEMP12V

12V DC Mini EMP / Surge Protector

  • Designed for 12V DC systems
  • Battery, vehicle, equipment, and emergency power applications
  • Compact DC protection option
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12V DC DC

MEMP12VSAE

12V DC Mini EMP / Surge Protector with SAE Connection

  • Designed for 12V DC systems
  • SAE connection style
  • Good option for battery and vehicle-style connections
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12V DC DC

MEMPT12V

12V DC Mini EMP / Surge Protector

  • Designed for 12V DC systems
  • Battery, vehicle, and equipment protection applications
  • Compact low-voltage DC protection option
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12V DC DC

MEMP12VMC4

12V DC Mini EMP / Surge Protector with MC4 Connectors

  • Designed for 12V DC systems
  • MC4 connection style
  • Useful for solar, off-grid, and MC4-connected DC applications
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12V DC DC

MAXEMP12V

MAX EMP 12V DC Surge Protector

  • Designed for 12V DC systems
  • Higher-capacity 12V DC protection option
  • Battery, vehicle, and equipment protection applications
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250kA DC

12VEMP250KA

12V DC High-Capacity EMP / Surge Protector

  • 250kA surge current rating
  • High-capacity 12V DC protection
  • Designed for demanding 12V DC applications
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Selection note: DC surge protectors should be matched to the system voltage and connection style. For 12V DC systems, confirm whether the installation needs a hardwired, SAE, MC4, high-capacity, or marine network protection product.
NMEA 2000 / Marine DC

NMEA 2000 & Marine DC Surge Protectors

For marine electronics and NMEA 2000 networks operating on 12V DC systems. These products are designed to help protect connected marine electronics from damaging voltage transients.

Back to DC Section
12V DC DC

SPN2K-12DA

NMEA 2000 12V DC Surge Protector

  • Designed for NMEA 2000 marine networks
  • 12V DC network protection
  • Helps protect marine electronics and connected devices
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12V DC DC

SPN2K-12BA

NMEA 2000 12V DC Surge Protector

  • Designed for NMEA 2000 marine networks
  • 12V DC network protection
  • Marine electronics and onboard network protection
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Marine note: NMEA 2000 surge protectors are for marine network protection. For other 12V DC battery or equipment protection, use the correct 12V DC surge protector for the installation and connection style.
24V–76.8V DC

24V–76.8V DC Surge Protectors

For 24V, 36V, 48V, 60V, 72V, and 76.8V DC battery, vehicle, equipment, off-grid, emergency power, and specialty low-voltage DC systems. Select the product that matches the actual DC system voltage and connection style.

Back to DC Section
24V DC DC

MEMP24V

24V DC Mini EMP / Surge Protector

  • Designed for 24V DC systems
  • Battery, vehicle, equipment, and emergency power applications
  • Compact low-voltage DC protection option
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24V DC DC

MEMP24VMC4

24V DC Mini EMP / Surge Protector with MC4 Connectors

  • Designed for 24V DC systems
  • MC4 connection style
  • Useful for solar, off-grid, and MC4-connected DC applications
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24V DC DC

MAXEMP24V

MAX EMP 24V DC Surge Protector

  • Designed for 24V DC systems
  • Battery, vehicle, equipment, and emergency power applications
  • Higher-capacity DC protection option for 24V systems
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36V DC DC

MAXEMP36V

MAX EMP 36V DC Surge Protector

  • Designed for 36V DC systems
  • Battery, vehicle, equipment, and specialty DC applications
  • Higher-capacity DC protection option for 36V systems
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48V DC DC

MAXEMP48V

MAX EMP 48V DC Surge Protector

  • Designed for 48V DC systems
  • Battery, equipment, off-grid, and emergency power applications
  • Higher-capacity DC protection option for 48V systems
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60V DC DC

MAXEMP60V

MAX EMP 60V DC Surge Protector

  • Designed for 60V DC systems
  • Battery, equipment, off-grid, and specialty DC applications
  • Higher-capacity DC protection option for 60V systems
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72V DC DC

MAXEMP72V

MAX EMP 72V DC Surge Protector

  • Designed for 72V DC systems
  • Battery, equipment, vehicle, and specialty DC applications
  • Higher-capacity DC protection option for 72V systems
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76.8V DC DC

MAXEMP76.8V

MAX EMP 76.8V DC Surge Protector

  • Designed for 76.8V DC systems
  • Battery, equipment, and specialty DC applications
  • Higher-capacity DC protection option for 76.8V systems
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Selection note: DC surge protectors must be matched to the actual DC system voltage. Do not use a lower-voltage DC surge protector on a higher-voltage DC system unless the product is specifically rated for that voltage.
MAXDC High-Voltage DC

MAXDC High-Voltage DC Surge Protectors

MAXDC surge protectors are available in multiple DC voltage ratings for higher-voltage DC systems. Select the product that matches the actual DC system voltage.

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15V DC DC

MAXDC15V

MAXDC 15V DC Surge Protector

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25V DC DC

MAXDC25V

MAXDC 25V DC Surge Protector

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50V DC DC

MAXDC50V

MAXDC 50V DC Surge Protector

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60V DC DC

MAXDC60V

MAXDC 60V DC Surge Protector

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64V DC DC

MAXDC64V

MAXDC 64V DC Surge Protector

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100V DC DC

MAXDC100V

MAXDC 100V DC Surge Protector

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150V DC DC

MAXDC150V

MAXDC 150V DC Surge Protector

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200V DC DC

MAXDC200V

MAXDC 200V DC Surge Protector

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250V DC DC

MAXDC250V

MAXDC 250V DC Surge Protector

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300V DC DC

MAXDC300V

MAXDC 300V DC Surge Protector

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350V DC DC

MAXDC350V

MAXDC 350V DC Surge Protector

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380V DC DC

MAXDC380V

MAXDC 380V DC Surge Protector

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400V DC DC

MAXDC400V

MAXDC 400V DC Surge Protector

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420V DC DC

MAXDC420V

MAXDC 420V DC Surge Protector

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450V DC DC

MAXDC450V

MAXDC 450V DC Surge Protector

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480V DC DC

MAXDC480V

MAXDC 480V DC Surge Protector

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500V DC DC

MAXDC500V

MAXDC 500V DC Surge Protector

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550V DC DC

MAXDC550V

MAXDC 550V DC Surge Protector

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600V DC DC

MAXDC600V

MAXDC 600V DC Surge Protector

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Selection note: Higher-voltage DC surge protectors must be matched to the actual DC system voltage. Do not select a lower-voltage product for a higher-voltage DC system.
MC4 DC Surge Protectors

MC4 DC Surge Protectors

MC4 DC surge protectors are available in multiple voltage ratings for solar, off-grid, battery, and DC equipment applications using MC4-style connections. Select the product that matches the actual DC system voltage.

Back to DC Section
15V DC MC4

MAXSSPMC4-15V

MC4 DC Surge Protector

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25V DC MC4

MAXSSPMC4-25V

MC4 DC Surge Protector

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40V DC MC4

MAXSSPMC4-40V

MC4 DC Surge Protector

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50V DC MC4

MAXSSPMC4-50V

MC4 DC Surge Protector

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60V DC MC4

MAXSSPMC4-60V

MC4 DC Surge Protector

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64V DC MC4

MAXSSPMC4-64V

MC4 DC Surge Protector

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100V DC MC4

MAXSSPMC4-100V

MC4 DC Surge Protector

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145V DC MC4

MAXSSPMC4-145V

MC4 DC Surge Protector

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150V DC MC4

MAXSSPMC4-150V

MC4 DC Surge Protector

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200V DC MC4

MAXSSPMC4-200V

MC4 DC Surge Protector

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250V DC MC4

MAXSSPMC4-250V

MC4 DC Surge Protector

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300V DC MC4

MAXSSPMC4-300V

MC4 DC Surge Protector

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350V DC MC4

MAXSSPMC4-350V

MC4 DC Surge Protector

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380V DC MC4

MAXSSPMC4-380V

MC4 DC Surge Protector

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400V DC MC4

MAXSSPMC4-400V

MC4 DC Surge Protector

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420V DC MC4

MAXSSPMC4-420V

MC4 DC Surge Protector

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450V DC MC4

MAXSSPMC4-450V

MC4 DC Surge Protector

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480V DC MC4

MAXSSPMC4-480V

MC4 DC Surge Protector

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500V DC MC4

MAXSSPMC4-500V

MC4 DC Surge Protector

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550V DC MC4

MAXSSPMC4-550V

MC4 DC Surge Protector

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600V DC MC4

MAXSSPMC4-600V

MC4 DC Surge Protector

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Selection note: MC4 surge protectors should be matched to the actual DC system voltage and connector style. If the installation does not use MC4-style connections, choose the correct hardwired or non-MC4 DC surge protector instead.
Need Help Choosing?

Not Sure Which Surge Protector You Need?

If you are not sure which Bad Wolf surge protector matches your system, contact us with the system voltage, AC or DC type, application, and any connection requirements. We can help point you toward the correct product.

Helpful information to send: Voltage, AC or DC, single-phase or three-phase, wye or delta, hardwired or MC4, and equipment being protected.
For contractors and OEMs: Ask about product selection, bulk orders, dealer pricing, and specialty applications.
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