MS27615 Connectors, Electrical, Plug, Ratchet Lock Coupling, Firewall Series

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MS27615F

For class K connectors:

a.  The connectors described herein shall meet all the environmental and electrical requirements specified in MIL-DTL-26500.

b.  In addition to the requirements specified in MIL-DTL-26500, the connectors shall meet the following requirements.

1.  Fireproof:  A connector plug mated to its applicable receptacle assembly shall be mounted as used in service on a fixture fabricated in accordance with MIL-DTL-5015 and subjected to a 1,093°C flame for a period of 60 minutes.  The flame shall be directed at the connector, and shall completely encompass the connector.  The temperature of the flame shall be measured at .250 inch, vertical distance from the rear of the connector.  The flame shall be produced by using propane fuel with a high air-to-fuel mixture at a flow rate equivalent to an input of 33,000 to 37,000 BTU/HR. The assembly shall be vibrated continuously at 33 Hz

with total excursion of .250 inch for 60 minutes.  The contacts shall carry the following dc current for the first 5 minutes of the test.

During the next minute of test, 110/125 volts at 60 Hz shall be applied between adjacent contacts and between contacts and the shell without exceeding 2 amperes of line current.  Throughout the test, there shall be no passing of

Flames through the connector, nor shall there be any secondary combustion at the rear of the panel mounted connector.

There shall be no adapters or extensions other than the standard cable clamp assembled to the connectors during the fireproof test.

2.  Insulation resistance, fireproof:  After the flame test, the connectors shall be allowed to cool to room temperature, the mated connectors shall then be subjected to a test potential of 500 V dc.  The insulation resistance of the connectors shall be greater than

2,000 megohms.

3.  Dielectric withstanding voltage, fireproof.  After exposure to the flame and insulation resistance tests, the mated connectors shall be subjected to 1500 V ac rms.  Applied between adjacent contacts and the contacts closest to the shell, there shall be no evidence of breakdown or flashover.

4.  Contact retention, fireproof after exposure to the flame, insulation resistance and dielectric withstanding tests, the individual contact locking mechanism shall withstand the axial loads specified in the table.

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