logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

What type of protection should I choose for a 12v circuit in a domestic mechanism?

Brendy8606 2454 9
ADVERTISEMENT
Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
Reply | New topic
  • #1 17751184
    Brendy8606
    Level 3  
    This now gives me clarity on the connection situation. I'm going to deviate from the topic a little.
    zybex, and do you have any idea what such protections on 12 V are, what overcurrent switches are for high voltages. I am making a bar control mechanism at home and would like to protect it after the board that is powered on 12 V. Do I just rudely put in a car fuse? Are there any professional fuses so as not to make a wire. Any links would be appreciated.
  • ADVERTISEMENT
  • #2 17751458
    Wilktor
    Level 27  
    Maybe use a reusable fuse or a regular glass fuse
  • ADVERTISEMENT
  • #3 17751551
    zybex
    Helpful for users  
    Since it's something for 12V, you can use the typical one used in RTV equipment and more. I'm talking about the little 5x20mm glass one. It's also often found on car radio power cords, as well as in the housing holders on the appliance. You can easily buy even 10 ampere ones of this type.
  • #4 17751587
    CYRUS2
    Level 43  
    Specify the current consumption.
    Also the inrush current if it is a motor.
  • #5 17751681
    zybex
    Helpful for users  
    What are you powering this bar with anyway?
  • ADVERTISEMENT
  • #6 17751848
    Brendy8606
    Level 3  
    The bar is powered by two linear actuators with motors.
    Power supply 12v
    Output power 20w
    Continuous current 0.8-2A
    The circuit board is made in such a way that the circuit gets an impulse, lights the lamp and counts down the delay time of 3s and opens the actuator (bar) even if the power supply to the circuit is off, and I do this via a sonoff, triggering a + impulse with the phone. The system remembers that with the next pulse the motor has to turn the other way, i.e. close the bar. Between the sonoff and the circuit board I have a power supply unit which reduces the voltage to 12v to the circuit board, so on the output to the plus actuators I will give this glassless 5ah?
  • #7 17752506
    CYRUS2
    Level 43  
    A switch mode power supply does not require a fuse. Because it has an internal. Electronic.
  • #8 17752669
    kood
    CCTV and Stationary Alarms specialist  
    CYRUS2 wrote:
    Pulse power supply does not require a fuse. Because it has an internal. electronic.
    .

    The power supply may not require one, but the rest of the circuit may require one if the strength of the circuit is less than the capacity of the power supply.
  • #9 17752710
    Brendy8606
    Level 3  
    That's cool, thanks to CYRUS2 for the valuable reply. What is the difference between a switching power supply and a transformer power supply?
    Can impulse ones be used for most devices, obviously taking into account the power of the power supply for the device? I have several power supplies from led and would like to use them. E.g. if I have two 2x20 W actuators, would a 50 W impulse one be suitable?
    Fuse?
    40/12=3,3 A
    Then a 5 A glass one will be ok?
  • ADVERTISEMENT
  • #10 17753172
    CYRUS2
    Level 43  
    Brendy8606 wrote:
    That's cool, thanks CYRUS2 for the valuable reply. What is the difference in a switch mode power supply vs. a transformer power supply for example?
    .
    Transformer power supply for 2A - depends what it is.
    You won't buy that now. It doesn't have to be a factory CE device.
    Brendy8606 wrote:
    I would like to use it. E.g. if I have two 2x20w actuators, then such a 50w impulse would be suitable ?
    I think it would be sufficient. Question about the inrush current of these actuators.
    Brendy8606 wrote:
    Fuse?
    For the power supply it is unnecessary.
    On the other hand, what is on your board nobody knows.
Reply | New topic
Report a violation of the law

Topic summary

For protecting a 12V domestic control circuit powering two linear actuators (20W output, 0.8-2A continuous current), typical automotive or RTV 5x20mm glass fuses rated around 5A are recommended. Reusable or standard glass fuses commonly used in car radios and small appliances are suitable. The power supply unit feeding the circuit is a switching (impulse) type, which generally includes internal electronic protection and may not require an additional fuse. However, fusing the downstream circuit is advisable if the circuit's current rating is lower than the power supply capacity. The inrush current of the actuators should be considered when selecting fuse ratings. Transformer-based power supplies differ from switching power supplies mainly in design and efficiency, but switching power supplies are appropriate for LED and actuator loads if power ratings are matched. A 5A glass fuse is appropriate for a calculated load current of approximately 3.3A (40W/12V). The exact fuse choice depends on the circuit design and inrush current characteristics.
Summary generated by the language model.
Popular Topics
ADVERTISEMENT