The D2CB11-20 is a single-pole circuit breaker assembly intended for field addition or replacement in D2PB and N2PB panelboards. It has an ampere rating of 20 amps and a maximum voltage rating of 120/240VAC. The assembly includes the circuit breaker housed within its own factory-sealed enclosure, which is suitable for Class I, Division 2, Groups C and D hazardous areas. This design ensures safety and compliance while allowing for easy field installation, though these assemblies are not suitable for use as individually mounted units. They are ideal for expanding or servicing electrical systems in damp, wet, or corrosive environments such as petroleum refineries and chemical plants.