MIL-DTL-23928/2D
REQUIREMENTS:
Class 1: Dripproof (see note 1).
Class 2: Totally enclosed (see note 2).
Class 3: Watertight (see note 3).
Dimensions and configuration: See figures.
Composition: See table I.
Current rating: See table I.
Voltage rating: See table II.
Short circuit capacity: 100,000 amperes (AQB).
Bus bar sizes (minimum): 1 x 0.250 inch.
Bus bar feeder connection: Top and bottom.
Circuit breakers: See table II.
TABLE II. Circuit breakers.
Circuit breaker
Voltage
Specification
AQB-A50, A51
500 V ac
NQB-A50
250 Vdc
NOTES:
1. Class 1 panels with doors shall meet the 45 degree dripproof requirements, and panels without doors shall
meet the 15 degree dripproof requirements in accordance with MIL-STD-108. When used, drip shield
dimensions shall be as required to provide the specified degree of enclosure. Panels shall be furnished
without doors only when specified in acquisition documents.
2. Class 2 panels shall meet the totally enclosed requirements as specified in MIL-STD-108. Panels shall be
furnished without doors only when specified in acquisition documents.
3. Class 3 panels, with doors, gaskets, and drain opening, shall meet the watertight requirements as specified
in MIL-STD-108.
4. A split bus arrangement shall be provided when specified in the acquisition documents. The current rating
shown shall apply to each separate bus grouping.
5. Unless steel is specified in the acquisition document, panels shall be of aluminum construction.
Referenced documents. In addition to MIL-DTL-23928, this document references the following:
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