Overview
The Allen-Bradley 140-MN-0400 is a manual motor starter and protector engineered to safeguard small to medium-sized AC motors from overload and short-circuit faults. This compact, 3-pole device provides thermal-magnetic protection and is designed for mounting on DIN rail or direct panel installation. The 140-MN-0400 combines manual ON/OFF control with integrated overload protection in a single, space-efficient unit ideal for industrial automation, HVAC systems, and machine tool applications.
Key Features
- Current Rating: 2.5–4.0A adjustable protection; 4.0A instantaneous trip current of 44A maximum
- Voltage Rating: 415–690V AC, 50/60 Hz operation; 3-pole configuration
- Protection Type: Integrated thermal-magnetic protection—overload sensing and short-circuit tripping in one compact unit
- Manual Reset: Quick manual reset mechanism for swift restoration after overload events
- Mounting: Supports both DIN rail and open/panel-mount installation options
- Visual Indicator: Trip indication window for quick visual fault status verification
Technical Specifications
- Catalog Number: 140-MN-0400 (Series /C)
- Poles: 3-pole
- Rated Current Range: 2.5–4.0A adjustable
- Voltage Range: 415–690V AC
- Frequency: 50/60 Hz
- Instantaneous Trip Current: 44A maximum
- Protection: Thermal-magnetic (overload + short-circuit)
- Reset Type: Manual
- Mounting: DIN rail or panel-mount
- Certifications: UL listed, CSA certified
- Operating Temperature: −25°C to +60°C
- Protection Class: IP20
- Manufacturer Status: Discontinued 08/31/2012
Typical Applications
- Small motor control in manufacturing and assembly operations
- HVAC system fan and pump motor protection
- Conveyor and material-handling equipment
- General industrial machinery requiring compact, reliable overload/short-circuit protection
- Legacy system maintenance and replacement in industrial control panels
Compatibility & Replacements
Compatible With
- Allen-Bradley 140-series motor starter/protector ecosystems
- Manual starter auxiliary contacts (140-A10, 140-A20, 140-A02)
- Standard DIN rail enclosures and panel-mount configurations
- AC motor circuits rated 415–690V, 50/60 Hz
- Industrial control systems requiring manual motor protection
Replaces / Drop-In Replacement For
- Older Allen-Bradley 140-MN-0400 units in legacy systems
- Similar 2.5–4.0A thermal-magnetic motor starters from legacy installations
Works With
- Allen-Bradley auxiliary contact modules and power distribution components
- Standard industrial AC power systems (single or three-phase, 415–690V)
- DIN rail enclosure standards and panel-mount infrastructure
- Manual motor control circuits (no PLC or networked integration required)
