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⏰ Automate smarter, not harder — your schedule’s new best friend!
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 30 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, HVAC, pumps, and industrial equipment in homes and commercial setups.
| ASIN | B07NBBYN4N |
| Best Sellers Rank | #6,961 in Home Improvement ( See Top 100 in Home Improvement ) #21 in Wall Timer Switches |
| Brand | Blackt Electrotech |
| Colour | White |
| Country of Origin | India |
| Customer Reviews | 4.1 out of 5 stars 629 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 |
N**L
Good product... Match the requirements well
Working properly and very useful
C**S
A good Digital Timer Switch.
A good Digital Timer Switch Relay. But time with main clock. It goes slow. Has to readjusted after some months.
V**I
Excellent product
Excellent performance
P**D
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 )
S**L
After 1 month purchase and timer not working
Not good product
G**P
Timer memory
Pls contact me, the timer back up batter is dead
L**S
Good product and works well.
So far, so good. Working well. Easy to install, easy to program Only problem is that the electrical connecting points are exposed so we had to improvise and attach a plastic strip to cover them. (See photos)
K**L
Value for money.
Good performance. Skill is required to set the timer. Value for money. Quality is good.