Siemens QSPD2A035B BoltShield Surge Protective Device
- 35kA per phase surge protection
- Plugs into Siemens load center bus, 2 poles
- Mechanical green/red indicators, not LED
- 240 volts
- 3-year standard warranty
- 6.4 ounces, 2 x 2.6 x 3 inches
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact plug-in surge device for Siemens panels and subpanels with a simple mechanical status flag. Its rating suits cascading protection more than serving as the only device on a large home.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B0BXVQR2P2Model: QSPD2A035BCategory: Surge Protectors
Overview
Siemens designed this BoltShield to plug straight onto the bus of an existing Siemens load center, taking two poles like a breaker. Mechanical green and red flags show at a glance whether it still protects.
Small size and quick plug-in install make it easy to add to main panels and subpanels for layered protection. The indicator is mechanical with no alarm.
Who it's for
Siemens panel owners who want to cascade surge protection through main and subpanels get a small, quick-fit device. Homes with other panel makers need their brand's device.
Pros and cons
- Plugs onto the bus
- Mechanical indicator needs no power
- Suits subpanels for layered protection
- Siemens load centers only
- No audible alarm
- Spec lists 35 A instead of kA
Performance notes
Surge devices work most effectively close to the loads they protect, which is why Siemens suggests adding them to panels throughout a building. The mechanical flags change color when protection is lost, with no electronics to fail. Rating per phase describes how large a spike each leg can handle.
Specifications
| Brand | Siemens |
|---|---|
| Model | QSPD2A035B |
| Dimensions & fit | |
| Item weight | 6.4 ounces |
| Item dimensions d x W x h | 2 x 2.6 x 3 inches |
| Power & efficiency | |
| Voltage | 240 volts |
| Compatibility & installation | |
| Mounting type | Plug-in to load center bus |
| Compatible Devices | Siemens load centers |
| Warranty & support | |
| Warranty Description | 3-year standard warranty |
| Other details | |
| Surge Protection Rating | 35kA per phase |
| Number of poles | 2 |
| Other Special Features of the Product | Green/red mechanical visual indicators |
Frequently asked questions
How do I check the Siemens QSPD2A035B is still protecting?
Look at its green/red mechanical visual indicators. They are mechanical, not LED.
Will the Siemens QSPD2A035B fit my panel?
It fits into existing Siemens load centers and plugs directly into the load center bus.
Can I use the Siemens QSPD in a subpanel?
Siemens says the QSPD series is easy to install in most panels throughout a building for whole facility protection.