Overview
The Gould A203B circuit breaker is a Size 0 industrial molded case circuit breaker rated for 20 amps at 600 volts AC. This unit has been part of Gould’s legacy of reliable electrical protection equipment used across manufacturing facilities, commercial buildings, and industrial automation systems. The A203B provides thermal-magnetic trip protection typical of industrial-grade circuit breakers for motor control and power distribution applications.
Key Features
- 20-amp continuous current rating for general industrial loads
- 600VAC voltage rating suitable for three-phase and single-phase industrial systems
- Size 0 form factor—compact frame design for space-constrained control cabinets
- Thermal-magnetic trip mechanism for overload and short-circuit protection
- Molded case construction for durability and flame resistance
- Proven design for retrofit and replacement in legacy systems
Technical Specifications
- Amperage Rating: 20A
- Voltage Rating: 600VAC
- Frame Size: Size 0
- Trip Type: Thermal-Magnetic
- Poles: 3-pole configuration
- Terminal Type: Lug connections (line and load)
- Certification: UL Listed industrial electrical equipment
Typical Applications
The A203B is commonly used in:
- Motor control centers (MCCs) and motor starter panels
- Industrial machinery branch circuit protection
- Legacy automation and control system retrofits
- Three-phase power distribution in manufacturing facilities
- Equipment protection where 20A capacity meets load requirements
Compatibility & Replacements
Compatible With
- Gould I-T-E control systems and motor starters
- Standard DIN rail and panel mounting in Size 0 spaces
- Three-phase 600VAC industrial power distributions
- Contactor and relay circuits rated 20A and below
Replaces / Drop-In Replacement For
The A203B serves as a direct replacement for other Gould Size 0 motor starters and contactors in the same form factor. Verify compatibility with your original circuit configuration and load specifications before installation. Gould spare parts (such as contact kits G203MB) are available for this series.
Works With
- Gould I-T-E motor control equipment
- Standard three-phase 600VAC power systems
- Manual and programmable circuit protection schemes
- Industrial control transformers and branch panel protection
