5pc DS402 5MM Miniature Round SelfReset Start Power Button — Normally Open Key Click Switch Why this switch Compact, reliable momentary start button for projects and equipment that need a clear tactile start/action control. Normally open (NO) design only closes the circuit while pressed, preventing accidental continuous power or signal flow. Selfreset (momentary) action returns to the rest position automatically after release, ideal for start, reset, or trigger functions. Key features and attributes Model: DS402. Pack: 5 pieces for replacements, multiple installations, or spares. Mounting: Designed for a 5MM panel hole (hole diameter: 5 mm). Form factor: Miniature round key/click switch with a tactile 'click' when actuated for clear user feedback. Operation: Selfreset (momentary) — press to make contact, release to break contact. Contact type: Normally open (NO) — circuit is open until the button is pressed. Typical uses: Start/power button, reset switch, momentary input for control circuits and user interfaces. Benefits — how it helps you Prevents accidental latching: NO and selfreset behavior ensures the circuit only engages when intentionally pressed. Clear user feedback: The tactile key click confirms actuation without needing visual confirmation. Spaceefficient: Miniature round design fits compact panels and small enclosures where larger switches won't fit. Costeffective pack: Five switches included, useful for multipoint installations or keeping spares on hand. Compatibility and applications Fits panels or enclosures with a 5 mm mounting hole. Suited to devices and projects that require a momentary start or trigger control. Common applications: DIY electronics and maker projects — momentary input for microcontrollers, control panels, and prototyping. Small appliances and equipment — start/reset button on compact devices or housings. Industrial and control interfaces — momentary operator controls, test equipment, or signal triggers. What to expect in the package Five (5) DS402 miniature round selfreset start power buttons. Each switch is a normally open key click (momentary) switch designed for installation in a 5MM panel hole. Notes for installation and use Ensure the panel opening is 5 mm to fit the switch properly. Verify electrical compatibility with your circuit before wiring; this switch is intended for use as a momentary control or signal input. Use standard wiring practices and secure connections for reliable operation. This DS402 5pc set provides a compact, tactile, and reliable normally open momentary start button solution for a wide range of smallscale electronic, appliance, and control applications.