Do I need fuses in my circuit?

Discussion in 'General Electronics Chat' started by Bjornk, Mar 21, 2013.

  1. Bjornk

    Thread Starter New Member

    Jan 28, 2013
    ok, so I have a simple circuit (runs on 5 v). The circuit has a PIC16F628A, some resistors, some transistors (2n4401 and tip31cg), 3 leds, 2 switches, one cap and a Motor (RS-360SH) with pump.
    The motor runs on 5v / 2.0 amps.

    Everything works like it should, but I'm wondering if I need to include a fuses in the circuit, just so it will be safe?

    One more thing when the motor has been running for some time the tip31cg transistor get pretty hot, is this normal? Maybe it need some heatsinks?


  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    I would use a 3.15 amp fuse and also use an heatsink on the tip31, or better still use an IRF630 fet, have you got a circuit diagram to post?
  3. GetDeviceInfo

    Senior Member

    Jun 7, 2009
    if you don't have current regulation, you might consider using a fuse to save your drivers/motor from damage due to motor stall.