Eaton BR Generator Interlock Kit & Inlet Wiring Guide
Connecting a 240V portable generator inlet (NEMA 14-50, L14-30, 14-30, or 6-50) to a Eaton BR load center requires a mechanical interlock plate matched to the main breaker layout (BRMIKCSR), a listed BR 2-pole backfeed breaker, and a mechanical breaker hold-down retainer per NEC 408.36(D).
By Gil Sapir, Editor
Fast Answer⚡ Interlock Reference: Eaton BR Load Centers▼
Mechanical Interlock Kit (BRMIKCSR) + BR Backfeed Breaker
30A or 50A Double-Pole BR Breaker • 6 AWG THHN Cu (50A Inlet) or 10 AWG Cu (30A Inlet)
Compatible Generator Inlet Configurations for Eaton BR
Comparison of NEMA 14-50, 14-30, 6-50, and L14-30 generator inlets when wired to a Eaton BR load center.
| Generator Inlet | Max Breaker / Amps | Continuous Load (80%) | Max Running Watts | Copper Wire Gauge | Pin Configuration |
|---|---|---|---|---|---|
| NEMA 14-50 (240V) | 50A 2-Pole (BR) | 40A | 12,000 W peak | 6 AWG Cu (THHN) | 4-wire RV/Generator Inlet |
| NEMA 14-30 (240V) | 30A 2-Pole (BR) | 24A | 7,200 W peak | 10 AWG Cu (THHN) | 4-wire Dryer/Generator Inlet |
| NEMA 6-50 (240V) | 50A 2-Pole (BR) | 40A | 12,000 W peak | 6 AWG Cu (THHN) | 3-wire Welder/Generator Inlet |
| NEMA L14-30 (240V) | 30A 2-Pole (BR) | 24A | 7,200 W peak | 10 AWG Cu (THHN) | 4-wire Twist-Lock Generator Inlet |
Eaton BR Load Center Configurations & Interlock Reference Matrix
All 10 Eaton BR panel variants, main bus ratings, branch breaker types, and interlock kit references.
| Panel Configuration | Main Rating | Branch Breaker Type | Interlock Reference Model |
|---|---|---|---|
| Eaton BR Type 200A Main Breaker | 200A | Type BR | BRMIKCSR |
| Eaton BR Type 100A Main Breaker | 100A | Type BR | BRMIKCSR |
| Eaton BR Type 125A Main Breaker | 125A | Type BR | BRMIKCSR |
| Eaton BR Type 150A Main Breaker | 150A | Type BR | BRMIKCSR |
| Eaton BR Type 200A Main Breaker | 200A | Type BR | BRMIKCSR |
| Eaton BR Type 225A Main Lug | 225A | Type BR | BRMIKCSR |
| Eaton BR Type 200A Outdoor NEMA 3R | 200A | Type BR | BRMIKCSR |
| Eaton BR Plug-On Neutral 200A | 200A | Type BR | BRMIKCSR |
| Eaton BR Commercial 225A Panel | 225A | Type BR | BRMIKCSR |
| Eaton BR 42-Space 200A Main Breaker | 200A | Type BR | BRMIKCSR |
Generator NEMA 14-50 Inlet → Eaton BR Type 200A Main Breaker Panel Wiring
Required Hardware Checklist for Eaton BR
🔧 Mechanical Interlock Kit (BRMIKCSR)
Matched to Eaton BR main-to-branch breaker spacing. Physically prevents turning on the generator backfeed breaker while the main utility breaker is closed.
Check Retailer Availability on Amazon🔌 Outdoor Generator Power Inlet Box (30A / 50A)
NEMA 3R weatherproof generator inlet box (NEMA 14-50 / CS6365 for 50A or NEMA L14-30 for 30A) wired to a listed 2-pole BR backfeed breaker with hold-down kit.
Check Inlet Box Availability on AmazonRequired Wiring & Installation Accessories
50A Double-Pole Circuit Breaker
UL-Listed, mandatory for continuous EV charging load under NEC code.
6 AWG THHN Copper Wire (50ft Spool)
Heat-resistant 90°C copper conductor for conduit installation.
Hubbell HBL9450A / Bryant Electric 50A Industrial NEMA 14-50 Outlet
Industrial Grade heavy-duty receptacle (Hubbell HBL9450A / Bryant 50A). Mandatory safety upgrade to prevent melting on high continuous EV loads.
3/4" Schedule 40 PVC Conduit (10ft Lengths)
UV-resistant protection for exposed indoor/outdoor wire runs.
Generator Interlock Guides for Other Panel Lines
View NEC Article 702 interlock compatibility across other residential load center series:
Interlock Compatibility FAQ: Eaton BR
Is a mechanical generator interlock kit compliant with NEC code for Eaton BR panels?
Yes. Per NEC Article 702.5, a listed mechanical interlock plate physically prevents both the main utility breaker and the generator backfeed breaker from being turned on simultaneously in a Eaton BR load center, and NEC 408.36(D) requires a mechanical hold-down retainer on the backfed plug-on breaker.
What size wire and breaker are required for a 50A or 30A generator inlet on a Eaton BR panel?
A 50A generator inlet (NEMA 14-50 or CS6365) requires a 50A double-pole BR-type breaker with 6 AWG THHN copper wire in conduit (or 6/3 NM-B where permitted). A 30A generator inlet (NEMA L14-30 or 14-30) requires a 30A double-pole BR-type breaker with 10 AWG copper wire.
Which Eaton BR panel ratings are covered on this page?
This guide covers all 10 residential Eaton BR configurations, including BR Type 200A Main Breaker, BR Type 100A Main Breaker, BR Type 125A Main Breaker, BR Type 150A Main Breaker, BR Type 200A Main Breaker, BR Type 225A Main Lug, BR Type 200A Outdoor NEMA 3R, BR Plug-On Neutral 200A, BR Commercial 225A Panel, BR 42-Space 200A Main Breaker, using BR branch breakers and reference interlock kit BRMIKCSR.