Overview
The Westinghouse AQB-A101 is a de-ionized thermal-magnetic circuit breaker designed for naval shipboard electrical systems. With a 100-ampere rating and dual voltage capability (500Vac/250Vdc), this molded case breaker provides reliable overcurrent and short-circuit protection in demanding marine environments. The AQB-A101 features plug-in connectors for secure mounting on molded terminal blocks and non-interchangeable trip units.
Key Features
- 100-Ampere rating — suitable for high-current shipboard distribution circuits
- Dual voltage: 500Vac / 250Vdc — accommodates AC and DC naval power systems
- Thermal-magnetic trip mechanism — long-time and instantaneous protection functions
- De-ionized construction — superior arc suppression for marine service
- Plug-in installation — fast, secure connection to molded mounting blocks
- Non-interchangeable trip units — ensures proper amperage rating integrity
Technical Specifications
- Ampere Rating: 100A
- Voltage Rating: 500Vac / 250Vdc
- Interrupting Capacity: 15 kA @ 500V
- Trip Setting (Low): 1200–1400A
- Trip Setting (High): 500–700A
- Operating Temperature: 40–50°C
- Configuration: 3-Pole, 3-Phase
- Connection Type: Plug-In Connectors
- Trip Function: Long-Time (LI) and Instantaneous
- Mechanism Type: Thermal-Magnetic
- Frequency: 60 Hz / 60 cycles
- Application Class: Naval Shipboard
- NSN: 5925-00-492-7905
- Compatible Models: AQB-A101-100, AQBA101-100A
Typical Applications
The AQB-A101 is engineered for naval and military shipboard power distribution systems where high-amperage load protection is critical. Common applications include:
- Main switchboard and distribution panel circuits
- Propulsion and auxiliary equipment circuits
- Combat Information Center (CIC) and radio room power circuits
- DC-powered emergency and backup electrical systems
- Any marine installation requiring 500Vac/250Vdc ratings
Compatibility & Replacements
Compatible With
- Molded terminal blocks with plug-in stud connectors (AQB series mounting bases)
- Naval shipboard electrical distribution systems (MIL-SPEC compliant)
- Westinghouse/Eaton/ITE naval circuit breaker panels and switchboards
- AC and DC power systems rated 500Vac/250Vdc
- 60-cycle (60 Hz) electrical systems
Replaces / Drop-In Replacement For
- Westinghouse AQB-A101 (all suffix variants)
- Eaton AQB-A101-100A
- ITE AQB-A101 100-ampere naval breakers
- Cutler-Hammer AQB-A101 naval-rated units
Works With
- Naval Electrical Standards (MIL-E-22035, NAVSEA standards)
- Shipboard DC power distribution (125Vdc, 250Vdc)
- Shipboard AC power distribution (440Vac, 500Vac)
- Plug-in and front-mounted connection configurations
