Switches & Relays

Switches & Relays — Precision Control for Every Circuit

Whether you're building a DIY electronics project, repairing home appliances, or designing an industrial control system, the right switch or relay is the backbone of reliable circuit operation. Our Switches & Relays collection brings together a comprehensive range of components — from compact tactile push buttons and DIP switches to high-current relay modules and thermostat switches — all sourced for quality, durability, and compatibility with a wide range of voltages and applications. Browse our selection and find exactly what your project needs.

Explore Our Top Switches & Relays

• 1-Channel Relay Module 3.3V–24V Dual Optocoupler Isolation — A versatile, optically isolated relay board compatible with 3.3V to 24V logic, ideal for Arduino, Raspberry Pi, and PLC automation projects.
• 100/250 Pcs Tactile Push Button Switch Kit – 10 Types — A must-have assortment kit covering 10 switch types, perfect for prototyping, repairs, and breadboard experiments.
• 0-10V LED Dimmer Switch Module | Adjustable Brightness Control — Smoothly adjust LED brightness with this 0–10V analog dimmer module, suitable for commercial lighting systems and smart home setups.
• 12V 140A Dual Battery Isolator VSR LCD | Split Charge Relay — A heavy-duty voltage-sensitive relay designed for automotive and marine dual-battery systems, with a clear LCD status display.
• 10pcs KSD302 16A Snap-Action Thermostat Switch for Appliances — Reliable bimetallic snap-action thermostat switches rated at 16A, commonly used in kettles, heaters, and other household appliances.

Why Choose Our Switches & Relays?

• Wide Voltage Range: Components covering 3.3V logic-level signals all the way up to 250VAC mains applications.
• Diverse Form Factors: SMD tact switches, through-hole DIP switches, panel-mount rocker switches, waterproof stainless steel push buttons, and more.
• Quality & Safety: Optocoupler-isolated relay boards protect your microcontroller; circuit breaker lockouts provide LOTO-compliant safety on the job.
• Value Packs Available: Many products come in multi-packs and assortment kits, lowering your per-unit cost for repairs, prototyping, or production runs.
• Broad Compatibility: Designed to work with Arduino, Raspberry Pi, ESP32, PLC systems, automotive/marine electronics, and standard household appliances.

Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: What is the difference between a switch and a relay in electronic circuits?

A: A switch is a manually operated mechanical device that directly opens or closes a circuit. A relay is an electrically operated switch — a low-power signal (e.g., from a microcontroller) energizes a coil that mechanically or electronically switches a separate, often higher-power circuit. Relays like our 1-Channel Relay Module are essential when you need to control mains voltage or high-current loads safely from a 3.3V or 5V logic signal.

Q: What does "optocoupler isolation" mean in a relay module?

A: Optocoupler (optoisolator) isolation means the control side (your microcontroller) and the load side (the switched circuit) are electrically separated by a light-based signal inside the chip. This protects your Arduino or Raspberry Pi from voltage spikes or back-EMF generated by the load, dramatically improving reliability and safety.

Q: What is a tactile push button switch used for?

A: Tactile push button switches are momentary switches that complete a circuit only while pressed. They are widely used in PCB prototyping, user-interface panels, mouse buttons, and reset circuits. Our Tactile Push Button Switch Kit and Silent Micro Push Button Switches cover a variety of heights and footprints for nearly any application.

Q: How do I choose the right thermostat switch for my appliance?

A: Key parameters to match are the current rating (e.g., 16A), voltage rating (e.g., 250V), trip temperature, and physical form factor (snap-action disc vs. bimetallic strip). Our KSD302 Snap-Action Thermostat Switches and Kettle Thermostat Switches cover the most common appliance replacement specifications.

Q: Are these switches and relays compatible with Arduino and Raspberry Pi?

A: Yes. Most relay modules in this collection accept 3.3V or 5V control signals, making them directly compatible with Arduino, Raspberry Pi, ESP8266/ESP32, and similar platforms. Always check the coil voltage and trigger logic (active-high vs. active-low) in the product description before connecting to your specific board.