Checking Microswitches

NOTE: Label wires before disconnecting from switch to ensure proper connection to switch terminals.

Only terminals (A and B) are used.

1. Disconnect all wires from switch.

2. Attach continuity tester leads to common (A) and normally open (B) terminals.

  • When switch lever is released, there should be no continuity through the switch.
  • When lever is depressed (click is heard), there should be continuity through the switch.

3. Move lead from normally open (B) to normally closed (C) terminal.

  • When switch lever is released, there should be continuity through the switch.
  • When lever is depressed (click is heard), there should be no continuity through the switch.

4. If continuity test results are not as described, replace switch.

E38432


A-Common Terminal
B-Normally Open Terminal
C-Normally Closed Terminal

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