Square D QED Switchboard Specialists — Repairs, Retrofits & Custom Builds
From emergency breaker replacements to complete QED-2 modernization, we deliver fast with 4 NETA-certified testers on staff.
Talk to a QED Expert
Dan Mitchell · Sales
2,500+
Switchboards Repaired
800+
Custom Builds Shipped
10,000+
Breakers In Stock
UL 891
& NEMA PB-2 Compliant
100%
NETA Testing Included
50 States
Nationwide Shipping
Send Us Your One-Line — We'll Handle the Rest
Email or text us your one-line diagram and we'll engineer a complete solution — pricing, lead time, and drawings — usually within 24 hours. No obligation, no runaround.
One Call. Complete QED Service.
Whether you need a brand-new switchboard or a single replacement breaker, SDF handles it end to end — engineering, build, testing, and shipping.
Custom Builds
Tell us what you need — amperage, voltage, layout — and we'll engineer and build it from scratch. Delivered in weeks, not months.
Repairs & Rebuilds
Arc damage, failed breakers, burned bus — we've seen it all. Send photos, get a same-day quote, and we'll have it back to you fast.
Retrofits & Modernization
Swap obsolete breakers for modern replacements without replacing the whole switchboard. Same footprint, better protection, fraction of the cost.
NETA-Certified Testing
Every piece of equipment is tested by our in-house NETA-certified team before it ships. Test reports and documentation included — always.
Parts & Emergency Stock
10,000+ breakers and components in stock. PowerPact, Masterpact, I-Line, legacy frames — if we don't have it, we'll find it fast.
Trusted by Electrical Contractors, Facility Managers & Utilities Nationwide
From single-breaker emergencies to full switchboard lineups, teams across every industry rely on SDF.
“We needed a 3,000A QED-2 main section with a compressed timeline. SDF delivered it in 3 weeks with full NETA testing and documentation. No one else could match that.”
Join hundreds of companies who trust SDF
336-340-4302The SDF Difference
We're not the biggest shop out there, and that's by design. When you work with SDF, you get a team that knows your project by name — not a ticket number.
4 NETA-Certified Testers On Staff
Our testing team isn't outsourced or subcontracted. They're right here on our shop floor, testing your equipment with the same care they'd give their own. That kind of accountability is hard to find.
Decades of QED-Specific Experience
We've been inside more QED switchboards than we can count. We know what fails, why it fails, and the right way to fix it. No guessing, no trial and error — just experience you can trust.
Parts In Stock — Current & Legacy
PowerPact, Masterpact, I-Line, QMB — we keep the parts that fail most often on our shelves, ready to ship. While others are placing factory orders, we're already packing yours.
Ready in Weeks, Not Months
Factory lead times can stretch 5 to 6 months. We consistently deliver in about 4 weeks. When your project timeline is tight, that difference matters — and we've built our entire operation around delivering on it.
Testing Included, Always
Every repair and every build gets full NETA-style testing. Test reports, torque charts, documentation — it's all included in the price. No surprise invoices, no add-ons. That's just how we do it.
Real People Answer the Phone
Call us with a technical question, and you'll get someone who speaks your language — SCCR, coordination studies, trip unit settings, bus ratings. Our team handles these conversations every day because it's what we love doing.
Our Promise: Quality Above All
Every switchboard that leaves our facility is built to UL 891 and NEMA PB-2 standards, tested by NETA-certified technicians, and backed by complete documentation. We don't ship until it's right — no exceptions, no shortcuts, no compromise.
Full-Service Repair & Reconditioning Center
Our state-of-the-art service center is staffed by skilled electro-mechanics with heavy-duty workstations and professional-grade testing equipment from Megger, ETI, HVI, and Doble. Every repair follows a rigorous, documented process — because your equipment deserves better than guesswork.
Low & Medium Voltage Breaker Repair
Complete maintenance and repair of low and medium voltage circuit breakers. Our skilled electro-mechanics work at heavy-duty workstations equipped with professional-grade power tools for precision results.
Electronic Trip Unit Repair
Specialized testing and restoration of electronic trip functionality. We repair and recalibrate Micrologic trip units, AC Pro trip programmers, and legacy electronic trip systems.
Comprehensive Testing Lab
Our testing laboratory features equipment from Megger, ETI, HVI, and Doble for high-potential readings, full load primary injection testing, vacuum bottle integrity assessment, timing evaluation, and contact resistance measurement.
Field Support & Emergency Service
On-site assistance and emergency response when you need it most. Our field technicians carry common replacement parts and testing equipment for rapid problem resolution.
Zero-Hertz & Specialized Testing
Dedicated zero-hertz testing services for specialized applications. Our technicians perform preliminary mechanical and electrical testing evaluation, structural alignment verification, and parts installation confirmation.
PEARL-Certified Quality
Our reconditioning work meets PEARL (Professional Electrical Apparatus Reconditioning League) standards — recognized by IEEE and federal agencies. Every repair includes a 70% intermediate review checkpoint before final completion.
Service Levels to Match Your Timeline
Standard
Planned maintenance during normal production schedules. Ideal for scheduled outages and preventive maintenance programs.
Expedited
Repair service under a compressed timeline — half the normal turnaround. For time-sensitive projects that can't wait.
Critical / Emergency
Emergency circuit breaker repair completed within 24-72 hours. For unplanned outages and mission-critical equipment failures.
Our Quality Control Process
Every piece of equipment goes through a documented quality control process before it leaves our facility.
Want the technical details? Keep scrolling. Ready to talk? We're here.
Meet Our QED Specialists
When you call SDF, you're not talking to a call center. You're talking to technicians who've spent decades inside QED switchboards. Our team includes 4 NETA-certified testers who personally inspect every piece of equipment before it ships.
Dan Mitchell
Sales
15+ years in electrical distribution
“I make sure every project stays on track — from first call to final shipment.”
336-340-4302
Ryan Torres
Engineer
NETA Certified12 years designing QED systems
“Send us your one-line — we'll engineer a solution that fits your space, your budget, and your timeline.”
Marcus Johnson
Sales
10+ years in switchboard sales
“We stock what other suppliers backorder. Call me and I'll get you a straight answer fast.”
336-340-4302
Chris Garza
Sales
8 years specializing in Square D
“Whether it's a single breaker or a full lineup, I'll get you quoted the same day.”
336-340-4302QED Switchboard Systems We Work On
QED-2 Power-Style Switchboards
- Up to 5,000A — covers virtually any distribution need
- 600V class with indoor and outdoor enclosure options (NEMA 1 & 3R)
- Flexible section widths from 12" to 54" to fit your footprint
- Service entrance or distribution — I-Line and QMB sections available
- Subdivision mains up to 4,000A for complex distribution layouts
Speed-D Merchandised Service Sections
- Compact 400A, 600A, and 800A mains — perfect for quick-ship projects
- EUSERC utility compartment configurations ready to go
- Up to 200 kA SCCR (fusible) for high fault current sites
- NQ lighting or I-Line power panelboard interiors built in
- Multi-voltage support: 120/240, 208Y/120, 480Y/277 Vac
QED Switchboard Spare Parts
We maintain one of the largest independent inventories of Square D QED switchboard parts in the country. Current production and hard-to-find legacy components — in stock and ready to ship, often same day.
Circuit Breakers
- PowerPact M-Frame (300–800 A)
- PowerPact P-Frame (100–1,200 A)
- PowerPact R-Frame (240–2,500 A)
- PowerPact H/J/L-Frame I-Line (15–600 A)
- Masterpact NW (800–5,000 A)
- Legacy: FA, FH, LA, LH, LC, LX frames
Trip Units & Rating Plugs
- Micrologic 3.0 (LI Protection)
- Micrologic 5.0 (LSI Protection)
- Micrologic 6.0 (LSIG + Ground Fault)
- Ammeter models (3.0A, 5.0A, 6.0A)
- Power metering (5.0P, 6.0P)
- Rating Plugs A through H — all ranges
Fusible Switches & Fuses
- QMB Group Mounted (30–1,200 A)
- QMJ Space-Saving switches
- Bolt-Loc Type BP (800–4,000 A)
- Class H, J, K, L, R, T fuses
- Replacement fuse clips & holders
- Blown fuse detectors
Breaker Accessories
- Shunt trip coils (120Vac, 24Vdc, 48Vdc)
- Undervoltage releases (UVR)
- Auxiliary & alarm switches (NO/NC)
- Key interlocks (Kirk-Key, Castell)
- Electrical & motor operators
- Zone selective interlocking modules
Bus & Connections
- Horizontal bus bars (up to 5,000 A)
- Vertical bus bars (up to 3,000 A)
- I-Line bus assemblies & plug-on adapters
- Bus splice kits & insulators
- Compression lugs & connection hardware
- Ground bars & bonding jumpers
Enclosure, Metering & More
- PowerLogic meters (PM820, PM850, PM870)
- Current transformers (CTs)
- Door handles, latches & interlocks
- Arc chutes & deionization grids
- Spring charging motors (Masterpact)
- Drawout cradles & racking mechanisms
Need a Part Fast?
If we don't have it listed, call us — we likely have it in stock or can source it within days. Same-day shipping on most in-stock items. No minimum order.
Dan Mitchell
QED Sales Expert
“Need a specific part? I can check stock right now.”
Our QED Switchboard Repair Process — Step by Step
We don't cut corners. Every repair follows a documented process developed over decades of QED experience. Here's exactly what happens when your equipment comes through our shop.
Intake & Assessment
Day 1–2
Initial Inspection
Visual examination for arc damage, overheating, corrosion. Photograph all damage. Check nameplate data and document trip unit settings.
Diagnostic Testing
Insulation resistance (Megger), contact resistance, continuity, trip unit functional test, mechanical operation check.
Scope of Work
Itemized repair list with part numbers, replacement vs. refurbishment recommendations, cost estimate, and customer approval.
Disassembly & Repair
Day 3–10
Controlled Disassembly
Remove trip unit and accessories, disconnect connections, extract arc chutes, remove operating mechanism. All components labeled for reassembly.
Component-Level Repair
PowerPact: replace contacts, arc chutes, springs, mechanism pivots. Masterpact: inspect stored energy mechanism, charging motor, pole unit contacts, cradle alignment.
Bus Work & Connections
Clean and re-silver connection surfaces, torque all connections to spec, replace damaged insulators, verify clearances.
Reassembly & Calibration
Day 11–14
Reassembly
Install repaired/replaced components, reconnect trip unit and auxiliaries, verify proper alignment and clearances.
Trip Unit Calibration
Set long-time, short-time, instantaneous pickup and delay per customer spec. Configure ground fault and zone interlocking if applicable. Document all settings.
NETA Testing & Certification
Day 15–18
Complete NETA Acceptance Testing
Visual/mechanical inspection, torque verification, insulation resistance, contact resistance, functional testing of all devices.
Documentation Package
Test reports, before/after photos, torque charts, trip unit settings, calibration certificates, warranty documentation.
Packaging & Shipping
Day 19–20
Protective Packaging
Custom crating for breakers over 400 A, foam cushioning for trip units, climate protection for long-distance shipping.
Delivery Coordination
Tracking information, delivery appointment scheduling, installation support available if needed.
Dan Mitchell
QED Sales Expert
“Send me photos of your damage — I'll get you a quote same day.”
NETA-Certified Testing — Our 4-Person Testing Team
Every piece of equipment that leaves SDF has been tested by one of our 4 NETA-certified technicians. Not a third party. Not a subcontractor. Our people, our responsibility, our guarantee.
Visual & Mechanical
- Verify nameplate data
- Check for shipping damage
- Inspect bus bars & connections
- Check door interlocks & safety
- Examine arc chutes & contacts
Torque Verification
- Every connection torqued to spec
- Documented with tech signature
- Calibrated wrenches exclusively
- Re-check after thermal cycling
Electrical Testing
- Insulation resistance (1000V Megger)
- Contact resistance (micro-ohmmeter)
- Continuity verification
- Phase rotation confirmation
- Current injection for trip units
Functional Testing
- Manual open/close (multiple cycles)
- Shunt trip verification
- Auxiliary switch operation
- Spring charging motor
- Ground fault trip verification
4 NETA-Certified Technicians
Unlike competitors who outsource testing, every test at SDF is performed by a NETA-certified technician with decades of Square D experience.
Testing Included — Not Extra
Complete NETA-style testing is included with every repair and custom build. No surprises, no hidden fees.
Complete Documentation
Full test report, torque chart (signed), before/after photos, trip unit setting record, and technician certification number.
Common QED Switchboard Repairs
After thousands of QED repairs, we know what fails and why. Here are the issues we see most often — and how we fix them.
PowerPact M/P/R Frame Common Repairs
Scroll to see full table →
| Problem | Symptoms | Our Solution |
|---|---|---|
| Worn main contacts | Overheating, high resistance, discoloration | Contact replacement, arc chute inspection |
| Failed trip unit | Won't trip on overcurrent, erratic behavior | Trip unit replacement or repair, recalibration |
| Damaged arc chutes | Arc marks, carbon tracking | Arc chute replacement, deionization grid check |
| Broken mechanism | Won't open/close, handle loose | Mechanism rebuild, spring replacement |
| Corroded connections | High resistance, heating at lugs | Clean/re-plate connections, new hardware |
| Rating plug mismatch | Nuisance tripping, won't carry load | Correct rating plug installation |
Masterpact NW Common Repairs
Scroll to see full table →
| Problem | Symptoms | Our Solution |
|---|---|---|
| Charging motor failure | Won't charge springs, motor hums | Motor replacement, control circuit check |
| Worn pole unit contacts | High resistance, overheating | Pole unit contact replacement |
| Micrologic trip unit failure | No display, erratic tripping | Trip unit replacement, firmware update |
| Drawout mechanism binding | Hard to rack in/out | Mechanism adjustment, rail cleaning |
| Cell switch malfunction | Won't recognize position | Cell switch replacement, wiring check |
| Spring fatigue | Slow operation, incomplete close | Spring replacement, mechanism service |
Dan Mitchell
QED Sales Expert
“Send me photos of your damage — I'll get you a quote same day.”
QED Switchboard Retrofits & Upgrades
Breaker-for-Breaker Retrofits
Replace obsolete breakers with modern equivalents while keeping existing structure:
Scroll to see full table →
| Obsolete Breaker | Modern Replacement | Benefits |
|---|---|---|
| LA/LH I-Line | PowerPact L-frame | Higher SCCR, modern trip units |
| MA I-Line | PowerPact M-frame | Micrologic protection, communications |
| DS/DSL | PowerPact H/J/L | Parts availability, better coordination |
| Masterpact M/ME | Masterpact NW | Digital trip units, improved arc resistance |
| Type NW (older) | Masterpact MTZ | Latest technology, improved safety |
Main Section Modernization
- Upgrade main breaker from 2,500 A to 4,000 A (bus permitting)
- Add ground fault protection (Micrologic 6.0 upgrade)
- Install zone selective interlocking between main and feeders
- Add metering section with PowerLogic equipment
- Convert fixed mount to drawout for improved maintainability
Distribution Section Upgrades
- Increase vertical bus capacity (1,600 A to 3,000 A)
- Add I-Line panel sections for additional feeders
- Convert QMB to QMJ for space savings
- Install surge protective devices (SPD)
- Add subfeed breakers for panel distribution
Industries We Serve with QED Expertise
Data Centers
- Main-tie-main for redundancy
- Masterpact NW drawout for hot-swap
- PowerLogic metering for PUE
- High SCCR requirements (100 kA+)
Industrial Manufacturing
- Heavy motor loads with high inrush
- MCC coordination
- Zone selective interlocking
- Harsh environment (NEMA 3R)
Healthcare Facilities
- Essential electrical system distribution
- Life safety & critical branch separation
- Ground fault protection per NEC 517
- Emergency power tie configurations
Commercial Buildings
- Service entrance switchboards
- Tenant metering (multi-metering)
- Emergency generator quick connect
- Utility coordination (EUSERC)
Critical Infrastructure
- Water/wastewater treatment
- Transportation hubs
- Government facilities
- Seismic-qualified equipment
Renewable Energy
- Solar farm collector boards
- Battery storage integration
- EV charging infrastructure
- Grid interconnect solutions
Frequently Asked Questions
QED-2 is the full-featured Power-Style switchboard platform, available up to 5,000 A with extensive customization options. Speed-D is a compact, merchandised version designed for quick delivery, available in 400 A, 600 A, and 800 A configurations with standard EUSERC utility compartments.
Yes. We regularly build replacement sections to match existing footprints, including non-standard dimensions. Provide your existing drawings or section dimensions, and we'll engineer a drop-in replacement.
We specialize in legacy equipment. Options include: sourcing reconditioned original breakers, retrofitting with modern equivalents, or engineering a new breaker mounting arrangement within your existing structure.
For in-stock items, same-day shipping is available. For critical emergencies, we offer expedited fabrication and can often compress timelines significantly with advance notice.
Yes. We provide approval drawings before fabrication and certified as-built drawings with shipment. Our drawings include single-line diagrams, front elevations, plan views, and bill of materials.
Yes. Every repair and custom build receives complete NETA-style testing performed by our in-house certified technicians. Test reports and documentation are included at no additional charge.
Usually yes. Options include PowerLogic power meters, circuit monitors, and ION meters. We can add metering compartments, install CTs, and integrate with your building management system.
QED-2 structures support up to 5,000 A main and 6,000 A through-bus with Masterpact NW circuit breakers. Custom configurations may require engineering review.
Yes. We ship throughout the continental United States and have experience with Alaska, Hawaii, and international shipments.
Yes. Options include energy-reducing maintenance switching, zone selective interlocking, arc flash relay systems, and remote racking solutions for Masterpact drawout breakers.
Dan Mitchell
QED Sales Expert
“Questions about testing requirements? I can walk you through it.”
Breakers We Stock, Repair & Replace
PowerPact Molded Case Circuit Breakers
Scroll to see full table →
| Frame | Amperage Range | SCCR @240V | SCCR @480V | SCCR @600V | Part Prefixes |
|---|---|---|---|---|---|
| M-frame | 300–800 A | 65–100 kA | 35–65 kA | 18–25 kA | MG, MJ |
| P-frame | 100–1,200 A | 65–125 kA | 35–100 kA | 18–25 kA | PG, PJ, PK, PL |
| R-frame | 240–2,500 A | 65–125 kA | 35–100 kA | 18–65 kA | RG, RJ, RK, RL |
Add “-C” suffix for 100% rated versions (e.g., PG-C, RK-C)
Masterpact NW Power Circuit Breakers (Stored Energy)
Scroll to see full table →
| Model | Amps | @240V | @480V | @600V | Mounting |
|---|---|---|---|---|---|
| NW WL1/YL1 | 800–5,000 A | 65 kA | 65 kA | 50 kA | Fixed or Drawout |
| NW WL3/YL3 | 800–5,000 A | 85 kA | 100 kA | 100 kA | Fixed or Drawout |
| NW WL7/YL7 | 800–5,000 A | 200 kA | 150 kA | 100 kA | Drawout Only |
| NW WA2 | 800–3,200 A | 42 kA | 42 kA | 42 kA | ANSI Rated |
| NW WA4/YA4 | 800–5,000 A | 65 kA | 65 kA | 65 kA | ANSI Rated |
| NW WA5/YA5 | 800–5,000 A | 85 kA | 85 kA | 85 kA | ANSI Rated |
| NW WA6/YA6 | 800–5,000 A | 100 kA | 100 kA | 100 kA | ANSI Rated |
| NW WA8/YA8 | 800–5,000 A | 200 kA | 200 kA | 130 kA | ANSI Drawout |
I-Line Group Mounted Circuit Breakers
Scroll to see full table →
| Frame | Amps | SCCR @240V | SCCR @480V | Catalog Numbers |
|---|---|---|---|---|
| FA/FH | 15–100 A | 25–65 kA | 18–25 kA | FAL, FHL |
| HD/HG/HJ/HL | 15–150 A | 25–125 kA | 18–100 kA | HDL, HGL, HJL, HLL |
| JD/JG/JJ/JL | 150–250 A | 25–125 kA | 18–100 kA | JDL, JGL, JJL, JLL |
| LA/LH | 125–400 A | 42–65 kA | 30–35 kA | LAL, LHL |
| LC/LX | 300–600 A | 100 kA | 65 kA | LCL, LXL |
| FI/KI/LI | 20–600 A | 200 kA | 200 kA | High magnetic only |
| QD/QG/QJ | 70–225 A | 22–100 kA | N/A | QDL, QGL, QJL |
Trip Units, Rating Plugs & Accessories
Micrologic Electronic Trip Units
Scroll to see full table →
| Model | Protection | Key Features |
|---|---|---|
| Micrologic 3.0 | Long-time + Instantaneous (LI) | Basic protection, true RMS sensing |
| Micrologic 5.0 | Long-time + Short-time + Inst. (LSI) | Short-time coordination |
| Micrologic 6.0 | LSI + Ground Fault (LSIG) | Equipment ground fault protection |
| 3.0A / 5.0A / 6.0A | LI / LSI / LSIG + Ammeter | Digital ammeter, LED indicators |
| 5.0P / 6.0P | LSI / LSIG + Power | Power measurement, LCD display |
| 5.0H / 6.0H | LSI / LSIG + Harmonics | Waveform capture, harmonic analysis |
Rating Plugs (for Micrologic 3.0, 5.0, 6.0 A/P/H Trip Units)
Plug A: 0.40–0.45–0.50–0.60–0.63–0.70–0.80–0.90–1.0
Plug B: 0.40–0.44–0.50–0.56–0.63–0.75–0.88–0.95–1.0
Plug C: 0.42–0.50–0.53–0.58–0.67–0.75–0.83–0.95–1.0
Plug D: 0.40–0.48–0.64–0.70–0.80–0.90–0.93–0.95–1.0
Plug E: 0.60–0.70–0.75–0.80–0.85–0.90–0.93–0.95–1.0
Plug F: 0.84–0.86–0.88–0.90–0.92–0.94–0.96–0.98–1.0
Plug G: 0.66–0.68–0.70–0.72–0.74–0.76–0.78–0.80–0.82
Plug H: 0.48–0.50–0.52–0.54–0.56–0.58–0.60–0.62–0.64
Circuit Breaker Accessories
- Shunt trip coils (120Vac, 24Vdc, 48Vdc)
- Undervoltage release (UVR) w/ time delay
- Auxiliary switches (NO/NC contacts)
- Alarm switches
- Key interlocks (Kirk-Key, Castell)
- Electrical & motor operators
- Padlock attachments
- Phase failure protection
- Zone selective interlocking (ZSI) modules
Masterpact NW Accessories
- Spring charging motor
- Shunt close
- Operations counter
- Transparent breaker cover
- Electric reset
- M2C/M6C programmable contact modules
- Drawout shutter & padlock
- Cradle cell key interlock
- Lifting and transport truck
PowerLogic Metering
- PM-820, PM-850, PM-870 Power Meters
- CM4250, CM4000T Circuit Monitors
- ION 7550/7650 Advanced Meters
- IOC44 I/O Card
- IOX2411, IOX0404 I/O Extenders
- PM8-ECC, ECC21 Ethernet Comms
- PM8M2222 Digital I/O Modules
Fusible Switches for QED Switchboards
Bolt-Loc Type BP (Individually Mounted)
Scroll to see full table →
| Rating | Class | Width |
|---|---|---|
| 800–1,600 A | L | 36" |
| 2,000–2,500 A | L | 42" |
| 3,000 A | L | 42" |
| 4,000 A | L | 48" |
All 100 kA SCCR. Accessories: electric trip, key interlock, CPT, blown fuse detector, ground fault interface.
QMB Group Mounted
Scroll to see full table →
| Rating | Fuse Class | Height |
|---|---|---|
| 30–100 A Twin | H, J, R | 4.5"–7.5" |
| 200 A Single | H, J, R | 9" |
| 400 A Single | H, J, R | 15" |
| 600 A Single | H, J, R | 15" |
| 800 A Single | Class L | 15" |
| 1,200 A Single | Class L | 24" |
QMJ Space-Saving
- Standard Class J fuse clips
- Compact design for high-density applications
- Same ratings as QMB in reduced footprint