The SC7301 is a compact 3-pin SPDT micro limit switch fitted with a lever arm. Its common, normally-open and normally-closed contacts let you choose a circuit that closes or opens when the lever is pressed. Use it for position sensing and controller endstop inputs after checking the mounting fit and input requirements.
Specifications
Datasheets
What's in the box
Switch quantity as ordered. Wiring and mounting hardware are separate.
Great for
Wiring & getting started
- Identify the three terminals
The pins are common (C), normally-open (NO) and normally-closed (NC). Do not assume the centre terminal is common. With the switch disconnected, use a multimeter to identify COM: it is the terminal shared by the pair that conducts at rest and the different pair that conducts when pressed. The product pinout shows 1 = COM, 2 = NC and 3 = NO; verify continuity before connecting.
- Choose NO or NC
Wire C + NO for a circuit that closes (turns on) when the lever is pressed, or C + NC for one that opens (turns off) when pressed. For endstops, match the controller's input wiring and logic, then verify the triggered state by hand before machine movement.
- Mount the switch
Fix it through the two mounting holes so the lever arm meets your moving part right at the travel limit. Leave a little over-travel so the switch fully actuates without bottoming out.
- Test the click
Actuate the lever by hand - you should feel a firm snap and hear a distinct click as the contacts change over. Confirm the switching with a multimeter before wiring it into your machine.
Note: The AC body marking is not a DC switching rating. For mains use, suitable insulation, an enclosure and competent electrical design are required. Verify the exact load suitability before use.