Kinda depends on what level he's working at.... and/or how much you want to be involved. Smallish breakers most people encounter in residential settings are thermal - magnetic and self contained. At the industrial level breakers start looking more like relays with control circuits. I could easily imagine a small relay, a sense resistor and a couple comparators to control it. Not quite as simple as a typical residential breaker, but you could hide more or less of it. -Denny On Sun, Nov 24, 2013 at 6:37 PM, Charles Craft wro= te: > What I'm looking for may not exist. > Not sure what the power source will be looking for a breaker under 1 amp > trip current. > Fuses in the 100's of ma are available from Radio Shack. Not cheap but > available. > > thanks > chuckc > > > -----Original Message----- > >From: Carl Denk > >Sent: Nov 24, 2013 8:08 PM > >To: "Microcontroller discussion list - Public." > >Subject: Re: [EE] Low current breaker > > > >Here are a couple of circuit breakers that are noisy when tripping, and > >then have visual indication. They usually show a white band on the push > >button when tripped. > > > http://aircraftproducts.wicksaircraft.com/viewitems/circuit-breakers/push= -pull-circuit-breaker > ? > > > http://aircraftproducts.wicksaircraft.com/viewitems/circuit-breakers/klix= on-circuit-breaker > ? > > > >These are pricey, but usually can be found much lower cost. > > > >On 11/24/13 7:44 PM, pic wrote: > >> Normal house fuses/breakers will pop at the rated current, voltage is > >> immaterial so you could just use that > >> In the UK lighting circuits are normally fused at 6 Amps, so dependin= g > on > >> the psu being able to supply the current to trip it this will work fin= e > >> (use a 12 V lead acid battery) > >> > >> > >> Years ago I replaced all the car fuses on a Citroen CX with domestic > >> resettable breakers (designed for 240V) including fitting a 100 amp > unit > >> for the alternator output, > >> It all worked faultlessly for over ten years, no changing fuses, just > >> occasionally flip a breaker on again > >> > >> PC > >> > >> -----Original Message----- > >> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On > Behalf Of > >> Carl Denk > >> Sent: 24 November 2013 22:31 > >> To: Microcontroller discussion list - Public. > >> Subject: Re: [EE] Low current breaker > >> > >> My heating contractor talks of a "Popper". As far as I can deduce, it'= s > a > >> breaker in the form of a blade fuse like automotive. Probably in the > >> 2-3 amp ratings. > >> > >> What about when the circuit opens, a relay drops out, normal closed > contact > >> closes, triggers a 555 timer with a sonalert buzzer, and an LED strobe= .. > Or > >> program a small PIC to do the work. :) > >> > >> > >> On 11/24/13 5:08 PM, Charles Craft wrote: > >>> My son is working on battery powered circuits in school. > >>> Near the end they will wire up a model of a small house. > >>> We would like to add a breaker inline so that he can short two wires > and > >> show the breaker tripping. > >>> Its doable with a low current fuse but having the sound and reset > ability > >> of a breaker would more closely match a real house. > >>> If everyone is watching they might see the flash of the fuse but then > >> that's more pieces for him to track. > >>> Thoughts? > >>> > >>> thanks > >>> chuckc > >>> > >>> > >>> > >> -- > >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change > >> your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > >> > > > >-- > >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > >View/change your membership options at > >http://mailman.mit.edu/mailman/listinfo/piclist > > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .