--- product_id: 404474026 title: "KEYESTUDIO 4 Channel Relay Shield 5V for Arduino Controller R3 ARM PIC AVR STM32 Raspberry Pi HIGH Level Trigger Relay Module Expansion Board" brand: "keyestudio" price: "€ 53.22" currency: EUR in_stock: true category: "Keyestudio" url: https://www.desertcart.sk/products/404474026-keyestudio-4-channel-relay-shield-5v-for-arduino-controller-r3 store_origin: SK region: Slovakia --- # 5V coil voltage for efficient control 4 onboard LED indicators for real-time status 3A max current for high-power devices KEYESTUDIO 4 Channel Relay Shield 5V for Arduino Controller R3 ARM PIC AVR STM32 Raspberry Pi HIGH Level Trigger Relay Module Expansion Board **Brand:** keyestudio **Price:** € 53.22 **Availability:** ✅ In Stock ## Summary > ⚡ Power your smart projects with precision and style! ## Quick Answers - **What is this?** KEYESTUDIO 4 Channel Relay Shield 5V for Arduino Controller R3 ARM PIC AVR STM32 Raspberry Pi HIGH Level Trigger Relay Module Expansion Board by keyestudio - **How much does it cost?** € 53.22 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/404474026-keyestudio-4-channel-relay-shield-5v-for-arduino-controller-r3) ## Best For - keyestudio enthusiasts ## Why This Product - Trusted keyestudio brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Play Compatibility:** Seamlessly integrates with Arduino R3 and Raspberry Pi for instant project upgrades. - • **Sleek & Functional Design:** Striking yellow-on-black PCB not only looks professional but also makes pin labels easy to read under any lighting. - • **Secure & Easy Installation:** Includes 3 M3 screw holes for stable mounting, ensuring your setup stays rock solid in any environment. - • **Visual Feedback at a Glance:** Four bright LED indicators keep you informed of relay status, eliminating guesswork during debugging. - • **Powerful & Reliable Switching:** Handles up to 120V AC / 24V DC at 3A, perfect for controlling high-current appliances with confidence. ## Overview The KEYESTUDIO 4 Channel Relay Shield is a robust 5V high-level trigger relay module designed for Arduino R3, ARM, PIC, AVR, STM32, and Raspberry Pi controllers. It supports switching up to 3A at 120V AC or 24V DC, features four onboard LED indicators for status monitoring, and offers a visually striking yellow-black PCB design. With easy plug-and-play compatibility and secure mounting options, it’s the perfect expansion board for professional-grade home automation and IoT projects. ## Description WHY CHOOSE KEYESTUDIO! 1.EXCELLENT QUALITY solder is very clean, everything is aligned nicely, all boards are well packed after function,voltage, current testing 2.COOL YELLOW BLACK DESIGN The yellow trim is definitely a departure from the standard, dull, black boards, and the yellow silk screen on black mask really pops, making it easy to read the pin labels 3. REALLY SAFE This board is made from environmental-friendly components and materials, as well as environmental-friendly production technology Features: Channel: 4 channel The relay shield is 5V active HIGH Contact capacity: AC120V / 3A ; DC24V/3A Onboard LED indicator for relay output status Indicator: 4 LEDs are red when the relay is driven high, the corresponding indicator will light up. Standard interface can be directly plugged into microcontrollers. Fully compatible with controller R3 board Power Interface: 5V DC power interface Indicator LED onboard for Relay output status Relay 1 (I/O pin 4) is connected to a terminal J4; Relay 2 (I/O pin 5) is connected to J3; Relay 4 is connected to J1. Be able to control various appliances and other equipment with large current. 3 M3 screw positioning holes for easy installation ## Features - It integrates 4-channel 5V relay module, and is fully compatible with R3 control board. - The 4-channel relay module shield is active at HIGH level. - Relay Terminals: high-power, high-current high voltage can be connected to the device. - Separately connect the 4-channel relay to digital port 4, 5, 6, 7 on the R3 control board, then through controlling output HIGH or LOW to control the relay on and off. - How to use: search for "keyestudio wiki ks0251" in Google Chrome to get the wiki online tutorial for this product. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07B2FTZD1 | | Brand Name | Keyestudio | | Coil Voltage | 5 Volts | | Connector Type | Through Hole | | Contact Current Rating | 3 Amps | | Contact Material | Silver Tin Oxide | | Contact Type | Normally Open | | Country of Origin | USA | | Current Rating | 3 Amps | | Customer Reviews | 4.5 4.5 out of 5 stars (74) | | Item Weight | 0.09 Pounds | | Manufacturer | keyes | | Maximum Switching Current | 3 Amps | | Maximum Switching Voltage | 120 Volts | | Minimum Switching Voltage | 24 Volts (DC) | | Model Number | KS0251 | | Mounting Type | PCB Mount | | Number of Items | 4 | | Operation Mode | Automatic | | Part Number | ks0251 | | UPC | 600346571792 | | Unit Count | 4.0 Count | | Wattage | 15 Watts | ## Product Details - **Connector Type:** Through Hole - **Contact Material:** Silver Tin Oxide - **Contact Type:** Normally Open - **Current Rating:** 3 Amps - **Mounting Type:** PCB Mount ## Images ![KEYESTUDIO 4 Channel Relay Shield 5V for Arduino Controller R3 ARM PIC AVR STM32 Raspberry Pi HIGH Level Trigger Relay Module Expansion Board - Image 1](https://m.media-amazon.com/images/I/51Lp4dSedVL.jpg) ![KEYESTUDIO 4 Channel Relay Shield 5V for Arduino Controller R3 ARM PIC AVR STM32 Raspberry Pi HIGH Level Trigger Relay Module Expansion Board - Image 2](https://m.media-amazon.com/images/I/51s54MAHpaL.jpg) ![KEYESTUDIO 4 Channel Relay Shield 5V for Arduino Controller R3 ARM PIC AVR STM32 Raspberry Pi HIGH Level Trigger Relay Module Expansion Board - Image 3](https://m.media-amazon.com/images/I/41T53312P1L.jpg) ![KEYESTUDIO 4 Channel Relay Shield 5V for Arduino Controller R3 ARM PIC AVR STM32 Raspberry Pi HIGH Level Trigger Relay Module Expansion Board - Image 4](https://m.media-amazon.com/images/I/61qxT6HWcfL.jpg) ![KEYESTUDIO 4 Channel Relay Shield 5V for Arduino Controller R3 ARM PIC AVR STM32 Raspberry Pi HIGH Level Trigger Relay Module Expansion Board - Image 5](https://m.media-amazon.com/images/I/51HYLjeicsL.jpg) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sk/products/404474026-keyestudio-4-channel-relay-shield-5v-for-arduino-controller-r3](https://www.desertcart.sk/products/404474026-keyestudio-4-channel-relay-shield-5v-for-arduino-controller-r3) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-09-23*