The CN4SB73 is a 70 A, 3-wire splitter box from the CN4SB series of Type 4/3R mild steel splitter boxes. It is the smallest size in the series, built for electricians and electrical contractors who need to split a 3-wire feed into multiple branch conductors inside a gasketed, hinged enclosure. The series is designed for distribution of up to 600 A (max) service at 600 V max, with 75° C conductor ampacity permitted; this size carries a CU/AL rating of 70/70 A.
The enclosure is listed at 12.00 x 10.00 x 5.00 in (305 x 254 x 127 mm) H x W x D in the series table, with a nominal size of 12 x 10 x 6 in on the part page and an overall depth of 5.85 in on the drawing. The drawing shows an 11.97 x 9.97 in door, a 10.52 x 8.39 in door opening, a 10.17 x 8.17 in inner panel and Ø0.50 in wall mounting holes on 10.50 x 8.50 in centres.
Construction is formed 16 gauge steel with smooth, continuously welded seams ground smooth, a formed lip to exclude flowing liquids and contaminants, and a seamless poured-in place gasket. Splitter blocks are factory installed (block reference CSBL125B). The hinged door uses quarter turn slot latches that require a tool to open, 304 stainless steel hinges and stainless steel hinge pins, and can be removed for modifications. The enclosure and cover are finished in recoatable smooth ANSI 61 gray powder coating; the included inner panel is white.
The CN4SB73 is CSA Type 3R, 12 and 4 rated and complies with IEC 60529, IP66. A hardware kit with panel mounting nuts and sealing washers is included, and grounding kit CGK125 is optional. It ships boxed at 12 lbs (5.44 kg).
| Series | CN4SB Series – Type 4/3R Mild Steel Splitter Box |
| Door Style | Hinge door with quarter turn |
| Description | 3R/4 Splitter Box 70A 3 Wire - Steel/Gray |
| Product Type | Splitter Box |
| Companion Part | 4-wire version: CN4SB74 |
| Short Description | N4 SPLTR BOX 12X10X5 |
| Door Size | 11.97 in H x 9.97 in W |
| Door Opening | 10.52 in H x 8.39 in W |
| Enclosure Depth | 5.00 in (127 mm) |
| Enclosure Width | 10.00 in (254 mm) |
| Enclosure Height | 12.00 in (305 mm) |
| Inner Panel Size | 10.17 in H x 8.17 in W |
| Overall Depth (Drawing) | 5.85 in |
| Nominal Size (H X W X D) | 12 in x 10 in x 6 in (305 mm x 254 mm x 152 mm) |
| Wall Mounting Hole Spacing | 10.50 in x 8.50 in |
| Wall Mounting Hole Diameter | Ø0.50 in |
| CU/AL Amps | 70/70 |
| Conductor Ampacity | 75° C conductor ampacity permitted |
| Wiring Configuration | 3 wire |
| Splitter Block Reference | CSBL125B |
| Series Application Rating | Distribution of up to 600 A (max) service, 600 V max, using 3 or 4 wires |
| Series Accessories | Quarter turn inserts and keys, rear hole plugs, quarter turn assemblies, splitter blocks, mounting foot kit, replacement hinge pins, padlock adaptor, grounding kits, ventilation |
| Optional Grounding Kit | CGK125 |
| UPC | 623980022390 |
| UNSPSC | 39121324 |
| Packaging Type | Box |
| Shipping Weight | 12 lbs (5.44 kg) |
| Doors | Easily removed for modifications and interchangeable |
| Seams | Smooth, continuously welded seams ground smooth |
| Gasket | Seamless poured-in place gasket |
| Hinges | 304 stainless steel |
| Material | Formed 16 gauge steel |
| Hinge Pins | Stainless steel |
| Inner Panel | Included |
| Door Latches | Quarter turn slot latches requiring use of a tool for opening |
| Hardware Kit | Includes panel mounting nuts and sealing washers for wall mounting holes |
| Enclosure Lip | Formed lip on enclosure to exclude flowing liquids and contaminants |
| Door Stiffeners | Provided where required for increased strength and rigidity; designed to also permit additional mounting options |
| Splitter Blocks | Factory installed splitter blocks |
| Inner Panel Finish | White powder coating |
| Inner Panel Mounting | Collar studs provided for mounting inner panel |
| Enclosure & Cover Finish | Recoatable smooth ANSI 61 gray powder coating |
| IEC 60529 | Complies with IEC 60529, IP66 |
| CSA Rating | CSA Type 3R, 12, 4 |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
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The series table lists 70/70 A CU/AL. The CN4SB series is designed for distribution of up to 600 A (max) service at 600 V max, with 75° C conductor ampacity permitted.
3-wire. The 4-wire version of the same size is the CN4SB74.
It is CSA Type 3R, 12 and 4 rated and complies with IEC 60529, IP66.
12.00 x 10.00 x 5.00 in (305 x 254 x 127 mm) H x W x D per the series table; the part page lists a nominal 12 x 10 x 6 in, and the drawing shows 5.85 in overall depth.
The optional grounding kit for this size is CGK125.
Yes, the inner panel is included and finished in white powder coating.
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