Allen-Bradley 140-CMN-6300 140M Series 63A Motor Protection Circuit Breaker

Product Description

The 140-CMN-6300 is a versatile Motor Protection Circuit Breaker (MPCB) within the Allen-Bradley 140M line. This device integrates multiple control functions—including manual switching, thermal overload protection, and magnetic short-circuit protection—into a single modular unit.

Engineered for motor branch circuit integrity, it supports a wide current range with a precision adjustable trip setting from 40A to 63A. The 140-CMN-6300 is built for high-demand industrial environments, offering high breaking capacities across various voltage levels and a robust mechanical lifespan of 30,000 operations.

Detailed Technical Specifications

• Model Number: 140-CMN-6300

• Brand: Allen-Bradley / Rockwell Automation

• Rated Operational Current (Ie): 63 A

• Thermal Trip Adjustment Range: 40 A to 63 A

• Magnetic Release Current: 890 A

• Operating Voltage Range: 230V AC to 690V AC

• Rated Frequency: 40 to 60 Hz

• Ultimate Short Circuit Breaking Capacity (Icu): 50 kA at 230/240V AC; 20 kA at 400/415V AC; 10 kA at 500V AC

• Trip Class Performance: Class 10

• Mechanical Operations: 30,000 cycles

• Electrical Operations: 5,000 cycles

• Terminal Torque Requirements: 6–10 Nm (55–90 lb-in)

• Applicable Wire Size: #8-14 AWG Copper wire

• Wire Insulation Rating: 75°C

• Net Weight: 1.96 kg (4.31 lbs)

Industrial Applications

The 140-CMN-6300 is primarily deployed as a manual motor starter or as the primary protective element in multi-component motor branch circuits. It is frequently found in control panels for heavy-duty pumps, ventilation fans, and conveyor systems where localized motor disconnection and overcurrent protection are required.

Technical FAQ

• Can the 140-CMN-6300 handle high-frequency switching?

  It is designed for a maximum switching frequency of 20 operations per hour to ensure the thermal elements accurately track motor temperature.

• Is the magnetic trip setting adjustable?

  The thermal (overload) trip is adjustable between 40-63A, but the magnetic (short-circuit) trip is a fixed standard setting of 890A for rapid fault response.