Allen-Bradley 140M-C2E-B16 Bulletin 140M C-Frame Motor Protection Circuit Breaker

Product Description

The 140M-C2E-B16 (specifically the 140M-C2E-B16-KN-MT assembly) is a specialized 3-pole motor protector from the Allen-Bradley Bulletin 140M family. This C-Frame device is engineered to provide integrated protection for low-current industrial motors, combining a calibrated thermal overload relay and a fixed magnetic short-circuit trip into a single compact chassis. By consolidating these functions, the unit reduces the total footprint required in the control cabinet while ensuring compliance with global motor protection standards.

Designed for precise current control, the 140M-C2E-B16 features a thermal adjustment dial ranging from 1.0 to 1.6 Amperes. It utilizes a Class 10 trip characteristic, which is standard for most industrial motor applications, providing sufficient delay for motor starting while ensuring rapid disconnection during overcurrent events. Despite being designated as discontinued by the manufacturer, it remains a vital component for the maintenance and repair of legacy motor control centers.

Technical Specifications

• Brand: Allen-Bradley (Rockwell Automation)

• Model Number: 140M-C2E-B16

• Frame Rating: C-Frame (Up to 32A)

• Operational Range: 1.0 to 1.6 Amperes

• Magnetic Short-Circuit Trip: 21 A (Fixed)

• Trip Performance: Class 10

• Maximum Voltage: 600V AC

• Breaking Capacity: Normal Break (2-series)

• Installation: Standard 35mm DIN rail or panel mounting

• Physical Dimensions: 3.63 x 3.18 x 2.93 in (92.0 x 81.0 x 74.5 mm)

• 3-Phase Horsepower Ratings:

• 0.25 HP @ 200V

• 0.33 HP @ 230V

• 1 HP @ 460V

• 1 HP @ 575V

Application and Maintenance

This circuit breaker is primarily found in small pump controls, conveyor systems, and localized fan starters. Since this part is no longer in active production, it is highly sought after for direct "form-fit-function" replacement in existing Allen-Bradley logic racks and starters where modern alternatives might require re-drilling or panel modifications.

Technical FAQ

What does "Fixed Magnetic" protection mean in this context?While the thermal portion is adjustable to match the motor's nameplate Full Load Amps (FLA), the magnetic trip is factory-set at 21A. This ensures the breaker ignores the momentary current spikes during motor startup but reacts instantly to a catastrophic short circuit.

Is this unit compatible with modern 140G or 140MT accessories?Generally, accessories for the 140M series (such as shunt trips or auxiliary contacts) are specific to the Bulletin 140M series. Always verify the compatibility of auxiliary blocks before installation to ensure proper mechanical engagement with the internal trip mechanism.