--- product_id: 111162674 title: "Blackt Electrotech BT41D4 : Digital Timer Switch Relay DIN Rail, 25 Amps Programmable Automatic On/Off (Single-Phase)" brand: "blackt electrotech" price: "VT4892" currency: VUV in_stock: true reviews_count: 8 category: "Blackt Electrotech" url: https://www.desertcart.vu/products/111162674-blackt-electrotech-bt41d4-digital-timer-switch-relay-din-rail-25 store_origin: VU region: Vanuatu --- # 25A heavy-duty relay capacity Backup battery for power outage safety 16 programmable ON/OFF cycles Blackt Electrotech BT41D4 : Digital Timer Switch Relay DIN Rail, 25 Amps Programmable Automatic On/Off (Single-Phase) **Brand:** blackt electrotech **Price:** VT4892 **Availability:** ✅ In Stock ## Summary > ⏰ Automate like a pro — never miss a beat with Blackt Electrotech BT41D4! ## Quick Answers - **What is this?** Blackt Electrotech BT41D4 : Digital Timer Switch Relay DIN Rail, 25 Amps Programmable Automatic On/Off (Single-Phase) by blackt electrotech - **How much does it cost?** VT4892 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/111162674-blackt-electrotech-bt41d4-digital-timer-switch-relay-din-rail-25) ## Best For - blackt electrotech enthusiasts ## Why This Product - Trusted blackt electrotech brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dual Mode Flexibility:** Seamlessly switch between AUTO timed control and MANUAL override for on-demand operation. - • **Robust 25A Relay Power:** Handles high-load single-phase devices like pumps, HVAC, and lighting with ease. - • **Space-Smart DIN Rail Design:** Compact, easy-to-install form factor fits perfectly in control panels without clutter. - • **Precision Scheduling Mastery:** Customize up to 16 daily/weekly ON/OFF programs for ultimate automation control. - • **Uninterrupted Settings Backup:** Built-in battery ensures your schedule stays intact even during power failures. ## Overview The Blackt Electrotech BT41D4 is a compact, DIN rail-mounted digital timer switch relay designed for precise, programmable control of single-phase electrical devices up to 25 amps. Featuring up to 16 customizable ON/OFF programs with 7-day scheduling, a backup battery to retain settings during outages, and flexible AUTO/MANUAL modes, it’s ideal for automating lighting, pumps, HVAC, and industrial equipment in homes and commercial setups. ## Description Product Description Precision Digital Timer for Automatic Control The Blackt Electrotech BT41D4 is a high-performance digital timer switch relay designed for precise control of electrical devices. With its fully programmable automatic ON/OFF function, it ensures devices operate exactly when needed, improving convenience, efficiency, and energy savings. Perfect for lighting systems, pumps, motors, and other single-phase appliances, this timer is a reliable solution for home, office, and industrial automation. DIN Rail Mounted for Easy Installation This timer switch features a DIN rail mounting design, allowing for quick and secure installation in distribution boxes, control panels, and other setups. The compact form factor ensures it takes up minimal space while remaining easily accessible for programming and maintenance. Fully Programmable for Flexible Scheduling The BT41D4 offers daily and weekly programmable settings, enabling users to schedule multiple ON/OFF cycles according to specific needs. This flexibility makes it perfect for applications like timed lighting, water pumps, factory machinery, and HVAC systems. Review: Quite useful product - The product is quite good. Even instructions are also quite helpful (see the official video of company on youtube). Now I had faced the problem of E1 or E2 error codes. After watching their official video I got the hint and corrected. I had searched for the solution to E1,E2 error codes but could not find. So briefly mentioning what is procedure So here is the sequence. 1) take a thin (like a ball pen tip) object press the soft cushion reset button just below the red led on right edge. This will RESET every thing. now the timer will show 00:00 2) now first you need to enter the Day : Hours : Minute as described in videos/instruction manual. In case the keyboard is locked. press the BIG RED unlock button. 3) after setting the time now press P BUTTON . it will show 1 ON set the on time as you want (as explained above) press P BUTTON again repeat same for OFF time and repeat this process as many times as you want multiple ON OFF times. 4) NOW TO COME OUT OF PROGRAMMING MODE PRESS THE "CLOCK BUTTON ON RIGHT SIDE OF P BUTTON. (May pressing other button landed me into E1, E2 problem.) Now you had come to TIME DISPLAY mode. 5) Now for safety press BIG RED button to lock this keypad. 6)If anywhere you missed sequence / pressed wrong button and get into E1 E2 business, 'LIKE ME' repeat the process with that thin object (ball pen tip). BY THE WAY SEE only THE OFFICIAL VIDEO FOR ACCURATE INFO/less confusion. I am using this product for a sump motor. The sump motor had come with it's own starter box. Now this output of this timer is given as input to that starter box. secondly i had kept in another plastic box since I did not have the DIN rack ) Review: Value for money. - Good performance. Skill is required to set the timer. Value for money. Quality is good. ## Features - 🕒 Programmable Automation: Easily set up to 16 On/Off programs with 7-day scheduling options, perfect for customizing operation for any day or combination of days. - ⚡ Wide Applications: Ideal for controlling streetlights, neon signs, water heaters, air conditioners, agricultural tools, and more. A versatile solution for homes, offices, and commercial setups. - 🔋 Backup Battery for Reliability: Built-in backup battery retains your settings during power outages, ensuring uninterrupted operation and convenience. - 🔄 Flexible Operation Modes: Switch effortlessly between AUTO (timed) and MANUAL (manual on/off) modes for full control at your fingertips. - 🛠️ Compact DIN Rail Design: Space-saving and portable, it fits seamlessly into your setup while maintaining access to other outlets. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07NBBYN4N | | Best Sellers Rank | #8,670 in Home Improvement ( See Top 100 in Home Improvement ) #24 in Wall Timer Switches | | Brand | Blackt Electrotech | | Colour | White | | Country of Origin | India | | Customer Reviews | 4.1 out of 5 stars 631 Reviews | | Display Size | 99 Millimetres | | Enclosure Material | Polycarbonate | | Importer Contact Information | Blackt Electrotech | | Included Components | false | | Item Dimensions D x W x H | 10D x 6W x 8H Centimeters | | Item Type Name | timer | | Item Weight | 130 Grams | | Manufacturer | Blackt Electrotech, www.blackt.in | | Manufacturer Contact Information | www.blackt.in | | Manufacturer Part Number | BT-21252 | | Material | Polycarbonate | | Model number | BT-21252 | | Number of settings | 16 | | Packer Contact Information | Blackt Electrotech | | Product Dimensions | 10D x 6W x 8H Centimeters | | UPC | 710918665375 | | Unit Count | 1.00 Count | ## Product Details - **Brand:** Blackt Electrotech - **Colour:** White - **Item Weight:** 130 Grams - **Material:** Polycarbonate - **Product Dimensions:** 10D x 6W x 8H Centimeters ## Images ![Blackt Electrotech BT41D4 : Digital Timer Switch Relay DIN Rail, 25 Amps Programmable Automatic On/Off (Single-Phase) - Image 1](https://m.media-amazon.com/images/I/614E06+DavL.jpg) ![Blackt Electrotech BT41D4 : Digital Timer Switch Relay DIN Rail, 25 Amps Programmable Automatic On/Off (Single-Phase) - Image 2](https://m.media-amazon.com/images/I/71v5NUCrf4L.jpg) ![Blackt Electrotech BT41D4 : Digital Timer Switch Relay DIN Rail, 25 Amps Programmable Automatic On/Off (Single-Phase) - Image 3](https://m.media-amazon.com/images/I/81AQttXbo9L.jpg) ![Blackt Electrotech BT41D4 : Digital Timer Switch Relay DIN Rail, 25 Amps Programmable Automatic On/Off (Single-Phase) - Image 4](https://m.media-amazon.com/images/I/71jD6bsTBtL.jpg) ![Blackt Electrotech BT41D4 : Digital Timer Switch Relay DIN Rail, 25 Amps Programmable Automatic On/Off (Single-Phase) - Image 5](https://m.media-amazon.com/images/I/71vlPgMo-wL.jpg) ## Questions & Answers **Q: How many programmes per day can set? howmany this day programmae will work.? what is the warrnaty condition?** A: 15 time **Q: Does this reset with power cut? Or it has a rechargeable battery?** A: It has a rechargeable battery and we need not reset it after power cut **Q: I need to use this switch use as my main swicth. I need to off/cut my grid power at night and on at morning. Is that will work?** A: It will in case your load on the mains is less than the rating of the relay in this timer, then it will work. But in case the load is more then you will have to use a contactor in between this timer and the mains **Q: How to change the battery when dead ?** A: Working fine ## Customer Reviews ### ⭐⭐⭐⭐⭐ Quite useful product *by P***D on 18 September 2025* The product is quite good. Even instructions are also quite helpful (see the official video of company on youtube). Now I had faced the problem of E1 or E2 error codes. After watching their official video I got the hint and corrected. I had searched for the solution to E1,E2 error codes but could not find. So briefly mentioning what is procedure So here is the sequence. 1) take a thin (like a ball pen tip) object press the soft cushion reset button just below the red led on right edge. This will RESET every thing. now the timer will show 00:00 2) now first you need to enter the Day : Hours : Minute as described in videos/instruction manual. In case the keyboard is locked. press the BIG RED unlock button. 3) after setting the time now press P BUTTON . it will show 1 ON set the on time as you want (as explained above) press P BUTTON again repeat same for OFF time and repeat this process as many times as you want multiple ON OFF times. 4) NOW TO COME OUT OF PROGRAMMING MODE PRESS THE "CLOCK BUTTON ON RIGHT SIDE OF P BUTTON. (May pressing other button landed me into E1, E2 problem.) Now you had come to TIME DISPLAY mode. 5) Now for safety press BIG RED button to lock this keypad. 6)If anywhere you missed sequence / pressed wrong button and get into E1 E2 business, 'LIKE ME' repeat the process with that thin object (ball pen tip). BY THE WAY SEE only THE OFFICIAL VIDEO FOR ACCURATE INFO/less confusion. I am using this product for a sump motor. The sump motor had come with it's own starter box. Now this output of this timer is given as input to that starter box. secondly i had kept in another plastic box since I did not have the DIN rack ) ### ⭐⭐⭐⭐ Value for money. *by K***L on 17 August 2025* Good performance. Skill is required to set the timer. Value for money. Quality is good. ### ⭐⭐⭐⭐⭐ One of the best automation products! *by N***R on 24 March 2021* Works like a charm. Installed it few days ago, using it to control my staircase and gate lights. Let's see how good it performs in a long run. Strongly recommended automation product for all size homes and offices. Not recommended for very heavy usage, experiences and reliability may differ. Will update on the performance after few months of usage. I wish it came with a face cover to protect the soft input buttons. ## Frequently Bought Together - Blackt Electrotech (BT41D4) : Digital Electronic Timer Switch 220V 25Amp DIN Rail Programmable - Blackt Electrotech 230V 24x7 Energy Saving Socket Timer Digital Programmable Plastic (White) - Blackt Electrotech BT31P2 White Water Proof 230Volt Auto Day/Night on and Off Photocell, Ldr Sensor Switch for Lighting (5 Pic Pack) --- ## 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.vu/products/111162674-blackt-electrotech-bt41d4-digital-timer-switch-relay-din-rail-25](https://www.desertcart.vu/products/111162674-blackt-electrotech-bt41d4-digital-timer-switch-relay-din-rail-25) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-04-22*