Overview
The Allen-Bradley 193-BSA90 is a solid-state bimetallic overload relay designed for motor protection in industrial automation and process control applications. Rated for 0.6–1.0A at standard voltage levels above 300V, this Series B unit provides manual reset functionality and meets NEMA B600 classification for reliable thermal overload detection.
Key Features
- Bimetallic thermal overload detection with 125% trip rating at dial setting
- Manual reset design prevents unintended automatic restart after fault conditions
- Compatible with Bulletin 100 contactors for integrated motor control
- NEMA B600 rated construction rated at 75°C with copper wire (AWG 14–8)
- 5KA short circuit rating at 600 volts ensures robust protection
- Compact form factor for standard DIN rail and contactor mount installations
Technical Specifications
- Current Rating: 0.6–1.0A
- Voltage Rating: Above 300V (same polarity)
- Series: B (Series B)
- Class: NEMA B600
- Trip Characteristic: 125% thermal overload at dial setting
- Short Circuit Rating: 5KA at 600V
- Wire Compatibility: Copper wire only, AWG 14–8
- Reset Type: Manual
- Tightening Torque: 16 LB-IN
- Breaker Rating: 25A listed
- Temperature Class: 75°C
- Bulletin: 193
Typical Applications
- Single-phase and three-phase motor starter circuits
- HVAC compressor and pump motor protection
- Industrial machine tool motor control
- OEM equipment requiring thermal overload backup
- Legacy control panel retrofits and spare parts replacement
- Variable load motor circuits requiring manual reset safety
Compatibility & Replacements
Compatible With
- Bulletin 100 contactors (direct mechanical/electrical integration)
- Manual starters and across-the-line motor control circuits
- Three-phase and single-phase AC motor protection
- Thermal overload protection schemes up to 600V
Replaces / Drop-In Replacement For
- Earlier Series A and earlier bimetallic relay units with identical mounting and current ratings
- Other 0.6–1.0A thermal overload relays in standard contactor assemblies
- Verify compatibility with your system integrator before ordering to ensure mounting configuration matches your contactor frame.
Works With
- Allen-Bradley Bulletin 100 three-phase and reversing contactors
- Standard NEMA B600 thermal overload protection architectures
- Manual motor control circuits with thermal backup
- Industrial control panels using traditional electromechanical protection schemes
