What Are Switches?

Switches are electromechanical components that open or close an electrical circuit through physical actuation. Common types include tactile switches (momentary push-button), toggle switches, rocker switches, DIP switches (for configuration), slide switches, rotary switches, and limit/micro switches. They are fundamental to user interfaces, configuration, safety interlocks, and mechanical detection in electronics. LCSC Electronics stocks 15,000+ switch SKUs from 150+ manufacturers, with options for every application from consumer gadgets to industrial machinery.

Switches — Definition and Sub-Categories

A switch is a device that makes or breaks an electrical connection through mechanical movement of contacts. Switches are classified by their actuation method (push, toggle, slide, rotate), contact configuration (SPST, SPDT, DPDT), and operating characteristics (momentary vs. maintained, normally-open vs. normally-closed).

How to Choose: Switches Selection Guide

Switch selection depends on four factors: (1) actuation type — momentary (returns to default when released) or maintained (stays in position); (2) contact configuration — SPST for simple on/off, SPDT for changeover, DPDT for motor reversal; (3) electrical ratings — current and voltage must exceed your circuit’s demands with safety margin; (4) environmental rating — IP67+ for outdoor or washable equipment. For PCB user interfaces, 6mm tactile switches are the industry standard. For configuration, DIP switches are compact and reliable.

Switches Comparison

Why Source Switches from LCSC Electronics

LCSC stocks 15,000+ switch SKUs from 150+ manufacturers, including well-known brands like ALPS, C&K, Omron alongside cost-effective Asian alternatives from BOOMELE, HRO, and XKB. The catalog covers the full range from ultra-miniature SMD tactile switches to high-current industrial toggle switches. Most switches are available from quantity 1 with volume discounts.

Frequently Asked Questions

Q: What does SPST, SPDT, and DPDT mean?

These describe a switch’s contact configuration. SPST (Single Pole Single Throw) is a simple on/off switch. SPDT (Single Pole Double Throw) switches between two circuits. DPDT (Double Pole Double Throw) switches two separate circuits simultaneously — commonly used for motor direction reversal.

Q: What is a tactile switch?

A tactile switch is a small momentary push-button switch that provides physical ‘click’ feedback when pressed. The most common size is 6×6mm for through-hole and 3×3mm or 4×4mm for surface mount. They’re used for user interface buttons on PCBs in consumer electronics, remote controls, and industrial panels.

Q: What is the difference between momentary and maintained switches?

A momentary switch returns to its default position (open or closed) when you release it — like a doorbell button. A maintained switch stays in whatever position you set it to until you physically change it — like a light switch. Choose based on whether your application needs a persistent state change or a temporary signal.

Q: How do I choose a switch for outdoor use?

Look for switches with IP65 or higher ratings. IP65 is dust-tight and resists water jets; IP67 survives temporary submersion. Also consider operating temperature range, corrosion-resistant contacts (gold-plated for low-current signal, silver for power), and UV-resistant housing materials.

Q: What is debouncing and why does it matter?

Mechanical switches ‘bounce’ — the contacts make and break multiple times within a few milliseconds during each actuation. Without debouncing (hardware RC filter or software delay), a microcontroller reads multiple false triggers from a single press. Standard debounce time is 10–50ms.

Q: Does LCSC stock waterproof switches?

Yes. LCSC carries IP67 and IP68-rated switches in multiple form factors including push-buttons, toggles, and micro switches. Filter by IP rating in the parametric search to find waterproof options suitable for outdoor, marine, or industrial washdown environments.