Mechanical Lugs for Electrical Panels
Mechanical Lugs for Electrical Panels: OEM vs. Replacement (Top 25 Panel Lines)
A practical guide to match OEM lug wire ranges on leading load centers & panelboards—and pick UL-listed replacement lugs from Conversions Tech.
Buyer’s guide: choosing the right mechanical lug
1) Wire range & conductor type
Match the panel’s permitted conductor size and copper/aluminum rating. A common spec for 200A panels is 6 AWG–250/300 MCM (dual-rated).
2) Mounting & footprint
Confirm one-hole vs two-hole, bolt size (¼″, 5/16″, ⅜″), and clearance under the deadfront. Straight vs. offset tongues help with bend space.
3) Torque & temperature
Use a calibrated torque wrench; many large AL lugs run ~250–300 in-lb. Follow both panel and lug instructions.
4) Higher-amp strategies
For 400–600A, use parallel conductors with multiple lugs per phase or step up to compression lugs if required.
Top 25 panel lines & compatible Conversions Tech lugs
OEM wire ranges summarized; Conversions Tech links cover the same or wider ranges. Units shown as MCM.
| Brand & Panel Line | Class | OEM Lug Wire Range (summary) | CT Compatible Lug | Notes |
|---|---|---|---|---|
| Square D QO (100–125A) | Residential | ≈ 6 AWG – 2/0 (Cu/Al) | AL Single-Barrel 6–250 MCM | Matches 6–2/0; compact for main-lug conversions. |
| Homeline (200–225A) | Residential | ≈ 4 AWG – 300 MCM | AL Single-Barrel 6–350 MCM | Headroom beyond 300 MCM. |
| QO 225A (MLO/sub-feed) | Res./Light Com. | ≈ 1 AWG – 300 MCM | AL Single-Barrel 6–350 MCM | Verify bolt (5/16″ typical). |
| I-Line 400A | Commercial | Up to ~600 MCM (single) or dual smaller | Two AL 6–350 MCM (parallel) | Use parallel conductors; two lugs/phase. |
| NQ 225A | Commercial | ≈ 6 AWG – 350 MCM | AL Single-Barrel 6–350 MCM | Direct match. |
| NF 225A | Commercial (480Y) | ≈ 6 AWG – 350 MCM | AL Single-Barrel 6–350 MCM | Check one-hole vs two-hole. |
| Eaton BR 200A | Residential | #1 AWG – 300 MCM | AL 6–250 MCM or 6–350 | Pick 6–350 when 300 MCM present. |
| Eaton CH 200A | Residential | ≈ 4 AWG – 300 MCM | AL 6–350 MCM | Mind cover clearance. |
| Eaton BR 125A | Residential sub | #1 AWG – 300 MCM (kit), common ≤1/0 | AL 6–250 MCM | Compact lug fits well. |
| Eaton CH 125A | Residential sub | #10 AWG – 1/0 | Copper Offset 14 AWG–1/0 | Tight gutters; all-copper path. |
| Pow-R-Line 1A 225A | Commercial | ≈ 6 AWG – 300 MCM | AL 6–350 MCM | 3/8″ bolt typical. |
| Pow-R-Line 3 / 400A | Power panel | Single to 300 MCM or dual smaller | Two AL 6–350 MCM | Parallel 3/0–4/0 conductors. |
| Siemens PL/SN 200A | Residential | ≈ 3/0 Cu or 4/0 Al (to ~250–300 MCM) | AL 6–250 or 6–350 | Use 6–350 for 300 MCM kits. |
| Siemens 125A (MLO) | Residential sub | ~6 AWG – 1/0 | Copper Offset 14 AWG–1/0 | Great for outdoor HVAC subs. |
| Siemens P1 250A | Commercial | 6 AWG – 350 MCM | AL 6–350 MCM | Field-installable kit footprint. |
| Siemens P2 400A | Power panel | Single large or dual conductors | Two AL 6–350 MCM | Two lugs/phase where permitted. |
| GE PowerMark 200A | Residential | ≈ 4 AWG – 250 MCM | AL 6–250 MCM | Legacy service friendly. |
| ABB ReliaGear 225A | Commercial | ≈ 6 AWG – 350 MCM | AL 6–350 MCM | Drop-in range match. |
| GE Spectra 400A | Industrial | Single large or dual 1/0–250 | AL 6–350 (single/parallel) | Use dual lugs for parallels. |
| Leviton 200A | Residential (smart) | Factory ≤2/0; optional ~300 MCM | AL 6–250 or 6–350 | Upgrade for 4/0 Al feeders. |
| Milbank 200A Combo | Residential service | ≈ 1 AWG – 300 MCM (load) | AL 6–350 MCM | Confirm orientation/fit. |
| Square D QO 3Ø 225A | Light commercial | ≈ 4 AWG – 300 MCM | AL 6–350 MCM | 3 lugs (one/phase) + neutral. |
| Eaton 3Ø BR 200A | 3-phase loadcenter | #1 AWG – 300 MCM | AL 6–250 or 6–350 | Same BR kit; + third phase. |
| I-Line 600A (Schneider) | Industrial | Dual 3/0–350 or single very large | Two AL 6–350 MCM | Parallel runs; dual lugs/phase. |
| Siemens ES 200A | Residential | ≈ 4 AWG – 250 MCM | AL 6–250 MCM | Match breaker landing bolt. |
| Eaton PRL2 250A | Commercial | ≈ 6 AWG – 300/350 MCM | AL 6–350 MCM | Common 208Y/120 lighting. |
| Square D Homeline 125A | Residential sub | ≈ 6 AWG – 2/0 | AL 6–250 MCM | Right-size for compact gutters. |
| Leviton 125A | Residential sub | ≈ #8 – 1/0 | Copper Offset 14 AWG–1/0 | Verify neutral bonding kit. |
| ABB/GE 3Ø 225A | Commercial | ≈ 6 AWG – 350 MCM | AL 6–350 MCM | Main or sub-feed lugs. |
| Siemens P1 Feed-Through | Commercial | 6 AWG – 350 MCM | AL 6–350 MCM | Matches field kit range. |
| Eaton CH 150A | Residential | ≈ 4 AWG – 300 MCM | AL 6–250 or 6–350 | Upsize feeders (VD optimization). |
Popular Conversions Tech mechanical lugs (in stock)
Aluminum Single-Barrel, 6 AWG–350 MCM
Dual-rated Cu/Al • One-hole (3/8″) • Panelboard & load-center friendly.
Aluminum Single-Barrel, 6 AWG–250 MCM
Perfect for 100–225A panels where 250 MCM is the cap.
Copper Mechanical, Offset Tongue 14 AWG–1/0
Compact for tight gutters and subpanels; excellent conductivity.
Compression Lugs up to 600–700 MCM
For very large conductors or two-hole requirements on higher-amp panels.
FAQ: Replacement lugs for panelboards
Will aftermarket lugs void my panel listing?
Use UL-listed lugs (UL 486) that meet the panel’s wire range and material, mount correctly, and are torqued per instructions. When in doubt, check with your AHJ.
Aluminum vs. copper lugs?
Aluminum, tin-plated lugs are standard for feeder terminations and are dual-rated for Cu/Al conductors. Copper mechanical lugs are great where a compact footprint or all-copper path is desired.
What about neutral/ground lugs?
Service equipment neutrals may require specific OEM kits or insulated mounting. If replacing a neutral lug, mirror the OEM’s bonding/isolating method.
