Allen-Bradley 140-CMN-6300 Manual Motor Starter Breaker

Overview
The 140-CMN-6300 is a Motor Protection Circuit Breaker from Allen-Bradley’s Bulletin 140 series. Designed for reliable protection of industrial motors, it features a rated operational current of 63 A and a magnetic release current of 890 A. This breaker ensures both overload and short-circuit protection while enabling manual circuit isolation for maintenance and safety procedures.

Technical Specifications

• Brand: Allen-Bradley / Rockwell Automation

• Series: 140M Circuit Breakers

• Part Number/Catalog No.: 140-CMN-6300

• IEC/EN60947-1,-2 Compliance: CE Marked

• CSA, C22.2 No.14 Compliance: CSA Certified

• UL508 Compliance: cULus Listed (File No. E54612, NLRV(7); E205542, NKJH(7); E197878, DIVQ(7))

• Compatible Applications: Motor branch circuit disconnect, branch-circuit protection, short-circuit (magnetic) protection, overload (thermal) protection, manual switching

• Max Current: 90 A

• Trip Setting: 40–63 A

• Current Rating: 16–90 A

• Operating Voltage: 230–690 VAC

• Short-Circuit Protection: Yes

• Standard Magnetic Trip: Yes

• High Magnetic Trip: Yes

• Wire Insulation Rating: 75 °C

• Torque: 6–10 Nm (55–90 lb-in)

• Overload Protection: Yes

• Trip Class: 10

• Mechanical Operations: 30,000

• Rated Operational Current (Ie): 63 A

• Electrical (Ie max.) Operations: 5,000

• Magnetic Release Current: 890 A

• Switching Frequency: 20 operations/hour

Description
The 140-CMN-6300 is engineered for motor protection and circuit isolation. It is ideal for disconnecting motor branch circuits, providing overload (thermal) protection, and short-circuit (magnetic) protection.

The breaker features a manually operated lever for engaging or disengaging circuits. Trip settings are adjustable from 40–63 A using a precision screwdriver. The magnetic release is rated at 890 A, and the ultimate short-circuit breaking capacity ranges from 4 A to 50 A depending on voltage.

For proper installation, use #8–14 AWG copper wire with a maximum insulation rating of 75 °C, and tighten connections to a torque of 6–10 Nm (55–90 lb-in). The breaker also allows for safe maintenance procedures, enabling circuit isolation through Lock-Out/Tag-Out (LOTO) practices.

Switching Ratings for Standard Three-Phase Motors:

• 230/240 VAC: 13/20

• 400/415 VAC: 25/32

• 500 VAC: 30/40

• 690 VAC: 37/55