Overview
The Westinghouse BA13A is a bimetallic thermal overload relay designed for protection of three-phase motors and electrical machinery in industrial applications. This Model B ambient compensated thermal overload relay features manual reset operation and is suitable for direct mounting on NEMA-size starters. The BA13A delivers reliable overcurrent protection with temperature-compensated sensing, ensuring consistent trip performance across varying ambient conditions.
Key Features
- 3-pole bimetallic thermal sensing element with ambient temperature compensation
- Manual reset operation for controlled system restart
- Auxiliary contact: 1 normally closed (1NC) for signaling and monitoring
- Trip Class 20 characteristics for coordinated motor protection
- Direct mounting capability on NEMA-size motor starters without accessories
- Rugged construction suitable for industrial control enclosures
Technical Specifications
- Part Number: BA13A (Model B)
- Contact Rating: 600 VAC maximum
- Operating Voltage: 360 VAC (50/60 Hz)
- Poles: 3-pole configuration
- Motor FLA Range: 0.25 to 26.2 amperes (adjustable heater required)
- Reset Type: Manual reset
- Auxiliary Contact: 1NC (normally closed)
- Trip Class: Class 20
- Compensation: Ambient temperature compensated
- Mounting: Starter mounting (NEMA sizes 00 to 5)
- Weight: 0.58 lbs
- Frequency: 50/60 Hz
- Status: Discontinued by manufacturer
Typical Applications
The Westinghouse BA13A thermal overload relay is commonly applied in:
- Three-phase induction motor protection circuits
- Industrial machinery and equipment starter control systems
- Oil refining, mining, and manufacturing facilities
- HVAC systems and pump motor protection
- General industrial electrical distribution panels
- Legacy automation systems requiring drop-in replacement components
Compatibility & Replacements
Compatible With
- Westinghouse motor starters and contactors (NEMA sizes 00 through 5)
- Cutler-Hammer A200 series starters and contactors
- Standard three-phase electrical distribution systems (50/60 Hz)
- Manual and magnetic motor control circuits
- Industrial control panels and switchgear assemblies
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The BA13A may replace earlier thermal overload relay models in legacy starter assemblies; however, exact cross-references depend on heater unit specifications and mounting configuration. Consult original equipment documentation to confirm pin-for-pin and dimensional compatibility.
Works With
- Manual motor control circuits and starters
- Magnetic contactor-based motor control systems
- Three-phase power distribution networks
- Industrial control enclosures and switchboards
- Class 10/Class 20 trip-class coordination schemes
