BE1-81 Maintenance
6-2
TEST PLUG
Test plugs (Basler part number 10095 or G.E. part number XLA12A1) provide a quick, easy method of
testing relays without removing them from their case. Test plugs are simply substituted for the
connection plugs. This provides access to the external stud connections as well as to the internal
circuitry.
Test plugs consist of black and red phenolic moldings with twenty electrically separated contact fingers
connected to ten coaxial binding posts. Fingers on the black side are connected to the inner binding
posts (black thumb nuts) and tap into the relay internal circuitry. Fingers on the red side of the test plug
are connected to the outer binding posts (red thumb nuts) and also connect to the relay case terminals.
When testing circuits connected to the bottom set of case terminals, the test plug is inserted with the
numbers 1 through 10 facing up. Similarly, when using the test plug in the upper part of the relay, the
numbers 11 through 20 are faceup. It is impossible, due to the construction of the test plug, to insert it
with the wrong orientation.
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