Relays & Solid State Relays
Relays & Solid State Relays
Whether you're building an Arduino automation project, designing a PCB circuit, or upgrading an industrial control system, the right relay makes all the difference. Our Relays & Solid State Relays collection offers a comprehensive range of switching solutions — from compact signal relays and optocoupler-isolated modules to high-current power relays and solid state relay (SSR) components. Available in a wide selection of coil voltages (3V, 5V, 12V, 24V, and 230V), current ratings (up to 63A), and form factors (DIP, SMD, PCB-mount, and panel-mount), you'll find the perfect relay for hobby electronics, home automation, automotive applications, and beyond. Stock up with our convenient multi-packs and assortment kits to keep your projects moving forward.
Featured Products
- 1-Channel Relay Module 3.3V–24V Dual Optocoupler Isolation — A versatile single-channel relay module with dual optocoupler isolation, compatible with 3.3V to 24V logic levels for safe MCU interfacing.
- 1-Channel DC 12V IR Remote Relay Switch Module for Arduino — Control loads wirelessly via infrared remote with this easy-to-use 12V relay switch module, ideal for DIY Arduino builds.
- 10PCS G3MB-202P SSR & Schottky Diode IC Component Pack — A solid state relay component pack featuring G3MB-202P SSRs and Schottky diodes for silent, high-speed switching without mechanical wear.
- 230V 40A/63A Adjustable Voltage & Current Protection Relay — A heavy-duty protection relay with dual display, adjustable thresholds, and up to 63A capacity for reliable mains-level circuit protection.
- 5-Pack G2RL-1 PCB Relay 5V 12V 24VDC – General Purpose — A five-pack of general-purpose PCB relays available in 5V, 12V, and 24VDC coil versions, perfect for prototyping and production builds alike.
Why Choose Our Relays & Solid State Relays?
- Wide Voltage & Current Range: From low-power 3V signal relays to 63A mains protection modules, we have a relay for every application.
- Optocoupler & SSR Isolation: Protect your microcontrollers and sensitive logic circuits with optocoupler-isolated modules and solid state relay designs.
- Arduino & MCU Compatible: Most modules are plug-and-play with Arduino, Raspberry Pi, ESP32, and other popular platforms.
- Bulk & Assortment Packs: Save more with 5-packs, 10-packs, and 100-piece lots — ideal for workshops, labs, and restocking.
- Multiple Form Factors: Choose from DIP, SMD, PCB-mount, panel-mount, and wireless RF modules to suit any build style.
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Frequently Asked Questions
Q: What is the difference between a mechanical relay and a solid state relay (SSR)?
A: A mechanical relay uses physical contacts to switch circuits, making it suitable for a wide range of loads but generating slight noise and wear over time. A solid state relay (SSR), such as the G3MB-202P SSR pack, uses semiconductor components for silent, high-speed switching with no moving parts, offering longer service life and faster response times — ideal for high-frequency switching applications.
Q: What voltage relay module do I need for an Arduino project?
A: Most Arduino boards operate at 5V logic, so a 5V coil relay module is the most common choice. However, if you're using a 3.3V board (such as ESP32 or Raspberry Pi), look for modules like the 1-Channel Relay Module with Dual Optocoupler Isolation, which supports logic levels from 3.3V to 24V and protects your MCU from back-EMF spikes.
Q: What does optocoupler isolation mean in a relay module?
A: Optocoupler isolation means the control circuit (your microcontroller) and the load circuit (the device being switched) are electrically separated using an optocoupler (a light-based signal coupler). This protects your Arduino or other sensitive electronics from voltage spikes and noise generated by the switched load, greatly improving reliability and safety.
Q: Can I use these relays for home automation or smart home projects?
A: Yes! Modules like the 433MHz RF Relay Receiver Module and the 1-Channel DC 12V IR Remote Relay Switch Module are excellent for wireless home automation, allowing you to control lights, fans, and other appliances remotely without rewiring your home.
Q: Are bulk relay packs available for larger projects or restocking?
A: Absolutely. We offer several multi-pack options, including the 100Pcs DC Power Relay 5V 12V 24V 20A 5-Pin PCB Auto Relay for automotive and PCB applications, as well as 10-packs of signal relays and power relays — perfect for electronics workshops, educational labs, and production-level builds.
