--- product_id: 568483884 title: "Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection" brand: "mioyoow" price: "AR$85874" currency: ARS in_stock: true category: "Mi Oyoow" url: https://www.desertcart.com.ar/products/568483884-voltage-monitor-module-a30-u1-dc-0-99-9v-delay store_origin: AR region: Argentina --- # 1-9 min customizable screen auto-off 0-99.9V precise voltage range Dual relay trigger modes (ON H / ON L) Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection **Brand:** mioyoow **Price:** AR$85874 **Availability:** ✅ In Stock ## Summary > ⚡ Stay ahead of power risks with smart voltage mastery! ## Quick Answers - **What is this?** Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection by mioyoow - **How much does it cost?** AR$85874 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/568483884-voltage-monitor-module-a30-u1-dc-0-99-9v-delay) ## Best For - mioyoow enthusiasts ## Why This Product - Trusted mioyoow brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Flexible Relay Modes:** Choose ON H for discharge or ON L for charging to perfectly match your battery system. - • **Instant Voltage Readout:** Real-time voltage display activates immediately on power-up—no waiting, no guesswork. - • **User-Friendly Interface:** Intuitive 3-button setup lets you customize parameters quickly without complex tools. - • **Smart Display Management:** Auto screen-off timer up to 9 minutes saves power and extends module lifespan. - • **Precision Voltage Control:** Set upper & lower voltage limits with 0.1V accuracy for ultimate device protection. ## Overview The MiOYOOW A30-U1 Voltage Monitor Module offers precise DC voltage monitoring from 0 to 99.9V with customizable upper and lower limits. Featuring a delay relay controller with dual trigger modes for charging or discharging applications, it ensures reliable overvoltage and undervoltage protection. Its smart display auto-off timer conserves energy, while an intuitive interface allows easy parameter setup. Compact and robust, it’s designed for professional-grade voltage detection and control. ## Description Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection: desertcart.com: Tools & Home Improvement ## Features - 1>Screen display Current Measured Voltage Value automatically after power ON. Press SET button enter into set mode and the first bit will keep flashing. The first parameter set is the Upper Limit Voltage Value. Press ENTER button to set first bit value. Its set range is 0~9 as your needs. Press SET button again to switch select the next bit and press ENTER button to change value. Press SET button at 3rd time to switch select the last bit and press ENTER button to change value. - 2>Then Then First Parameter ‘Upper Limit Voltage Value’ Has Been Set. Press SET Button At 4th Time To Set Next Parameter The Lower Limit Voltage Value In The Same Methods. Note: its value needs less than the Upper Limit Voltage Value. The third parameter is to set the Voltage Verification Value. Its set range is -0.5V~0.5V. The 4th parameter is to set the Display Screen Automatically Turns OFF Remaining Time Value. - 3>Its Set Range Is D-0 ~ D-9 Which Means After 1~9minute, The Screen Will Turn OFF. Note: d-0 means the screen will keen ON all the time. The 5th parameter is to set the Relay Triggering Status ‘ON H’ or ‘ON L’. ‘ON H’ : Relay output will turn ON if the Current Measured Voltage Value is more than the Upper Limit Voltage Value. Relay output will turn OFF if the Current Measured Voltage Value is less than the Lower Limit Voltage Value. It can be applied to battery discharging mode. - 4>ON L’ : Relay output will turn ON if the Current Measured Voltage Value is less than the Lower Limit Voltage Value. Relay output will turn OFF if the Current Measured Voltage Value is more than the Upper Limit Voltage Value.It can be applied to battery charging mode. Automatically enter detection status after set parameters and screen stop flashing. - After-Sale Service: Thanks for your purchase. If you have any problem , please feel free to contact us any time. We promise you the satisfying solutions within 24 hours. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CDGSG231 | | Best Sellers Rank | #337,828 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #275 in Voltage Testers | | Brand Name | MiOYOOW | | Color | black | | Compatible Devices | Various devices with compatible voltage and current ratings | | Customer Reviews | 4.6 4.6 out of 5 stars (62) | | Included Components | As shown in the packing list | | Item Dimensions | 3.07 x 2.09 x 1.18 inches | | Manufacturer | MiOYOOW | | Measurement Type | Voltmeter | | Minimum Operating Voltage | 6 volts_of_direct_current | | Model | A30-U1 | | Part Number | 439302 | | Power Source | Battery Powered | | Style Name | Compact | | UPC | 760606718319 | | Upper Temperature Rating | 85 °C | ## Product Details - **Brand:** MiOYOOW - **Color:** black - **Item dimensions L x W x H:** 3.07 x 2.09 x 1.18 inches - **Power Source:** Battery Powered - **Style:** Compact ## Images ![Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection - Image 1](https://m.media-amazon.com/images/I/51TpH2o4MjL.jpg) ![Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection - Image 2](https://m.media-amazon.com/images/I/61wz+4ImW4L.jpg) ![Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection - Image 3](https://m.media-amazon.com/images/I/61UutMwcy4L.jpg) ![Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection - Image 4](https://m.media-amazon.com/images/I/61I5FP4jdkL.jpg) ![Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection - Image 5](https://m.media-amazon.com/images/I/51Ia8htqIhL.jpg) ## Frequently Bought Together - Voltage Monitor Module, A30-U1 DC 0-99.9V Delay Relay Controller Board for Overvoltage Undervoltage Control Voltage Detection - Heschen Solar/Photovoltaic Fuse Holder, PV Fuse Holder, RT18-32(X), DC1000V 32A, 2 Pole, Blown Fuse Indication, 35mm DIN Rail Mounting, for ST-10PV 10 * 38mm Fuse - DEWIN 2P Arrester Device, Household Surge Protector 10kA-20kA 420V AC Surge Protective Low Voltage Arrester Device 35mm DIN Rail Mounting --- ## 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.com.ar/products/568483884-voltage-monitor-module-a30-u1-dc-0-99-9v-delay](https://www.desertcart.com.ar/products/568483884-voltage-monitor-module-a30-u1-dc-0-99-9v-delay) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-08-20*