Middle Atlantic MPR-JB663A – MPR Raceway Junction Box, 6 x 6 x 3 Inch
Middle Atlantic MPR-JB663A – MPR Raceway Junction Box, 6 x 6 x 3 Inch is backordered and will ship as soon as it is back in stock.
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Middle Atlantic MPR-JB663A – MPR Raceway Junction Box, 6 x 6 x 3 Inch
Product Overview
The Middle Atlantic MPR-JB663A is an optional junction box that installs on the end of a Middle Atlantic MPR raceway, enclosing the hardwired power connection for vertical rack power distribution. The box measures 6 inches deep by 6 inches wide by 3 inches high and is equipped with electrical knockouts for conduit entry. Steel construction with a black finish matches the MPR raceway it terminates. Its reduced 6-inch depth distinguishes it from the 8-inch-deep MPR-JB843A, MPR-JB853A, and MPR-JB863A boxes.
Product Description
Middle Atlantic MPR Series raceways run line-voltage power vertically along the rack, and hardwired installations require an enclosed termination point where the branch circuit lands. The MPR-JB663A junction box mounts on the end of the raceway and provides that enclosure, giving the electrical contractor a defined location to make and inspect connections. Pre-punched electrical knockouts accept standard conduit and cable fittings, so the feed can be brought in without drilling the enclosure in the field.
The 6" x 6" x 3" form factor trades depth for width compared with the 8-inch-deep boxes in the MPR junction box family, making it a practical choice where clearance behind the raceway is limited but generous wiring width is still needed. Steel construction stands up to installation handling, and the black finish blends with MPR raceways, rack rails, and surrounding hardware. Specifying the J-box alongside the raceway during design keeps power rough-in coordinated and ensures every MPR run finishes with a serviceable, code-friendly termination.
Key Features
- End-of-Raceway Mounting — Optional J-box fits on the end of a Middle Atlantic MPR raceway for hardwired power feeds.
- Electrical Knockouts — Pre-punched knockouts accept standard conduit and cable connectors with no field drilling.
- Reduced 6-Inch Depth — 6" x 6" x 3" enclosure suits installations with limited depth behind the raceway.
- Steel Construction — Rugged steel enclosure protects line-voltage terminations.
- Black Finish — Matches MPR Series raceways and rack hardware for a consistent finished look.
Technical Specifications
| Model | MPR-JB663A |
|---|---|
| Product Type | Junction box for MPR Series raceway |
| Dimensions (D x W x H) | 6" x 6" x 3" |
| Knockouts | Electrical knockouts included |
| Construction | Steel |
| Finish | Black |
| Brand | Middle Atlantic Products (Legrand AV) |
At Creartion Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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