28 Years Factory Miniature circuit breaker-FTM9-100 for Namibia Manufacturer

Overview:



Technical data

Product illustration

Tripping characteristic

Exterior and dimensions

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Model: FTM9-100
Pole: 1P,2P,3P,4P
Rated current (A): 63,80,100
Rated frequency: 50
Rated voltage (V) 230,400
Breaking Capacity: 10
Rated impulse withstand voltage Uimp(KV): 4
Operating cycle times: /hour 120
Power on 4000
Power off 10000
Conventional non-tripping current t≤1h(In=63A) t≤2h(In>63A)
Conventionaltripping current: 1.45In t<1h(In=63A) t<2h(In>63A)
2.55In 1s<t<120s
Instantaneous tripping type: D
Instantaneous non-tripping current: t≤0.1s 10In
Instantaneous tripping current: t<0.1s 20In
Connection Wire ㎜²: Min/Max 16/50
Size(L×W×H) 1P 72×27×85
2P 77×54×85
3P 77×81×85
4P 77×108×85




This video describes, in detail, how to construct a Current Limiting Device to protect you, your test equipment, and any electronic gear that you are testing or repairing. When used properly, it prevents short circuits from causing additional damage, particularly to expensive power transformers in amplifiers. It is also quite useful when first powering up previously untested and vintage equipment. It is not suitable for use with medium to large electric motors.

The bulb functions as a high-wattage resistor in which the resistance increases with the increasing heat of the filament. A “cold” bulb may offer only 2 or 3 ohms of resistance (the higher the wattage, the lower the resistance), but this will rapidly rise as the filament heats, particularly in the case of a short circuit…..protecting the circuit and dissipating the resulting filament heat in the form of light (warning you of the existence of the short).

IMPORTANT NOTE: The wattage of the bulb must be tailored to the current draw of the device being protected. The high-wattage bulbs (200W+) recommended in the video are primarily for Tube Amplifiers, which operate at relatively high current levels. With lower-current devices, such as Solid State amps, a lower wattage-higher resistance bulb (even as low as 40W) may be required for circuit protection.

For viewers in areas with 220-240VAC power: Although your voltage is double (220VAC vs 110VAC), your current flow is about half. Since the Current Limiter (CL) depends on current to rapidly heat the filament and increase its resistance, you need a bulb with higher filament resistance. Since the filament resistance of the bulb decreases with higher wattage, you should try a lower wattage, higher resistance bulb…..i.e. a 100W……initially, and then fine tune the wattage depending upon the power demands of the amplifier being protected.

The Photoflood Bulb used in this video is available on Amazon. Here is a link: http://www.amazon.com/Eiko-Supreme-Photoflood-Light-Bulb/dp/B000TZQUF0

If you enjoy seeing videos featuring classic vintage jukeboxes and guitar amplifiers, please consider subscribing to my channel, to gain easy access to over 100 related videos and to be notified when new videos are posted. Thanks for watching !!!



They broke the 1rst rule! SMASH THOSE CIRCUITS!

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