Sizes of circuit breaker casing

Circuit breaker casings come in a variety of sizes, which are typically measured in inches or millimeters. Here are some common sizes for circuit breaker casings:

Standard sizes:

• 1-pole: 1.5" x 4.5" (38 mm x 114 mm)
• 2-pole: 2" x 4.5" (51 mm x 114 mm)
• 3-pole: 2.5" x 4.5" (64 mm x 114 mm)
• 4-pole: 3" x 4.5" (76 mm x 114 mm)

Miniature circuit breakers (MCBs):

• 1-pole: 1.25" x 3.5" (32 mm x 89 mm)
• 2-pole: 1.5" x 3.5" (38 mm x 89 mm)
• 3-pole: 1.75" x 3.5" (44 mm x 89 mm)

Molded case circuit breakers (MCCBs):

• 1-pole: 2.5" x 6" (64 mm x 152 mm)
• 2-pole: 3" x 6" (76 mm x 152 mm)
• 3-pole: 3.5" x 6" (89 mm x 152 mm)
• 4-pole: 4" x 6" (102 mm x 152 mm)

Grounding circuit breakers:

• 1-pole: 2" x 4" (51 mm x 102 mm)
• 2-pole: 2.5" x 4" (64 mm x 102 mm)
• 3-pole: 3" x 4" (76 mm x 102 mm)

Other sizes:

• 5-pole: 4" x 6" (102 mm x 152 mm)
• 6-pole: 4.5" x 6" (114 mm x 152 mm)
• 8-pole: 5" x 6" (127 mm x 152 mm)

Please note that these sizes are approximate and may vary depending on the manufacturer and specific product. It's always best to check the specifications of the circuit breaker you are using to ensure the correct size casing is installed.