Siemens BoltShield FSPD140 Level 2 w/ Mounting Bracket + Whole House Ferrites EMP Home Protection Kit
Safeguarding your home or business from the threat of an electromagnetic pulse (EMP) is essential. Having the correct components installed to protect your home or shop is just as critical. The best way to do that is by taking 3 simple steps highlighted below using the following components included in this kit:
Siemens BoltShield FSPD140 Level 2 is a high-quality whole-house surge protection device, one of the most critical components in any EMP defense strategy. It helps prevent damaging voltage spikes from reaching your home’s electrical system.
High-Saturation Whole House Ferrites are specially engineered with high-frequency materials and uniquely modified to prevent high-current saturation. These ferrites clamp around the insulated incoming power wires in your breaker panel, helping to suppress harmful surges. Most homes require three ferrites, but some may need four (see video below for guidance). Ferrite Dimensions: Inner Diameter: 0.72″, Outer Diameter: 1.5″, Length: 1.9″
Kit Includes:
1 x Siemens BoltShield FSPD140 Level 2 (includes mounting bracket)
3 x High-Saturation Whole House Ferrites
Step 1: Install custom high-saturation ferrites over your incoming power wires. Normal ferrites will not work well due to current saturation. The ferrites sold here are each individually modified to increase their saturation levels, allowing them to suppress high-frequency energy under higher currents. Note: Most homes require three ferrites (for Line 1, Line 2, and a shared Neutral/Ground). Some homes may have four wires and therefore, would need four ferrites (Line 1, Line 2, Neutral, and Ground).
Typical installation shown below. Always consult manufacturer’s instructions, and have a professional electrician do the installation for safety. Please note that ferrites tend to make a humming or buzzing noise when high currents flow through them.

Step 2: Install a quality whole-house surge protection device. Recommended device: Siemens Boltshield (FSPD140).
We now sell the Siemens Boltshield FSPD140, available for order on our website. Installation should be done by a licensed electrician.
Step 3. Install smaller broadband ferrites around power cords of sensitive electronics. We sell a number of different sizes, as well as some bundles. Please see Broadband Ferrites.
What makes the High-Saturation EMP Ferrites Special?
The short answer is that normal ferrites will quickly saturate and become ineffective when placed on high-current lines. With my knowledge of electromagnetics, I was able to come up with a unique solution to the problem. See the video below for a detailed explanation.
Siemens BoltShield FSPD140 Level 2 Features:
- Surge Protection Device: Single Phase, 120/240V AC
- Let’s you know you are protected via LED’s & audible alarm
- Surge current capacity sized for where you live
- Boltshield protects any 120/240V branded load center
- Boltshield Surge Protective Devices (SPDs) are Type 2 and UL / cUL 1449 listed, meeting designated protection requirements
- Boltshield is constructed using commercial grade NEMA 4X enclosure allowing for indoor or outdoor installations
- Boltshield provides 140,000 Amp of surge current capacity per phase
- Compatible with any brand of load center and breakers
- Enclosure rated for type 4 outdoor, and can also be installed inside the load center
- 10 year product and connected equipment warranty
Other recommended EMP/EMF Home Protection devices:
