It is a terminology thing as in magnetic / hydraulic trip
Also, we routinely use supplemental IEC protection devices that have an
adjustable thermal trip plus a near instantaneous overcurrent trip
Actual tests in our shop have demonstrated to us that they will in fact trip
faster than a fast semiconductor fuse will blow
That is why we frequently install them ahead of motor drives to protect the
expensive semiconductor protection fuses.
Paul K0UYA
----- Original Message -----
From: "James R Carr" <n7fcf@hctc.com>
To: "Jim Thomson" <jim.thom@telus.net>; <amps@contesting.com>
Sent: Friday, January 07, 2011 8:01 PM
Subject: Re: [Amps] Fuses
> Where pray tell do you get a hydraulic breaker? I have installed several
> thousand over the years but have yet to see one filled with oil.
> As for current limiting devices, the fastest breaker will hold in for
> three
> to seven full cycles. To be current limiting, a fuse has to clear in less
> than 1/2 cycle.
> Jim
> N7FCF
> ----- Original Message -----
> From: "Jim Thomson" <jim.thom@telus.net>
> To: <amps@contesting.com>
> Sent: Friday, January 07, 2011 4:02 PM
> Subject: [Amps] Fuses
>
>
>> Date: Fri, 7 Jan 2011 10:45:07 -0500
>> From: "Carl" <km1h@jeremy.mv.com>
>> Subject: Re: [Amps] Fuses
>>
>> Just dont over fuse. The usual 1200W out amp uses 10-12A; 15A for
>> 1500-2200W, etc at 240VAC.
>>
>> Carl
>> KM1H
>>
>> ## why didn't they just get off the..'get cheap program' and use a
>> fast
>> breaker ??
>> Ideally, a 2 x pole, 15A , controlled magnetic hydraulic breaker would
>> be the 1st choice,
>> one with an..."instant trip" . The instant trip types are the fastest.
>> They just remove the oil
>> from the reservoir, so it's super fast. The normal, slow, and motor
>> start
>> types just use different grades
>> of viscosity for the oil used. I use em all the time for my various HB
>> projects. Any HB B+ supply
>> always gets a super fast magnetic hydraulic breaker..for the primary of
>> the plate xfmr. [they are also NOT
>> affected by ambient temp either].
>>
>> ## My Drake L4PS power supplies use 2 x 15A breakers, spaced a few
>> inch's
>> apart. One per hot leg.
>> These are the simple push button type. [ push to re-set]. The
>> advantage of the 2 x pole type noted above is..
>> the trip bar between em ensures both sides of the 240 line open up.
>>
>> ## You would think for the megabuck that alpha charges for their amps,
>> that they would not cheap out..and use
>> simple fuses !
>>
>> Later... Jim VE7RF
>>
>>
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>
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