Best quality and factory Moulded case circuit breaker-FTM2-DC to Plymouth Manufacturers


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Tripping characteristic

Exterior and dimensions

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Frame size Inm(A): 160 250 400 630
Rated current (A): 20,25,32,40,50,63,80,100,125,160, 160,180,200,225,250 250,315,350,400 400,500,630
Poles: 3 4 3 4 3 4 3 4
Rated voltage (V) AC: DC250,DC500,DC750,DC1000
Rated insulationvoltage(V): 1000 1000 1000 1000
Rated impulse withstand
voltage Uimp(KV):
800 800 800 800
Breaking Capacity: S S S S
Ultimate short-circuit capacity Icu (KA) DC250V: 30 / 30 / 30 / 30 /
DC500V: 25 / 25 / 25 / 25 /
DC750V: 15 15 15 20 15 20 15 20
DC1000V: / 10 / 10 / 10 / 10
Service short-circuit capacity
Ics (KA)
DC250V: 75%Icu / 75%Icu / 75%Icu / 75%Icu /
DC500V: 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu
DC750V: 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu 75%Icu
DC1000V: / 75%Icu / 75%Icu / 75%Icu / 75%Icu
operating performance Electrical life: 3000 3000 1000 1000
Mechanical life: 10000 10000 5000 5000
Arcing distance(mm) No more than 50 No more than 50 No more than 50 No more than 50
Class A
L(mm) 155 165 257 275
W(mm) 90 120 105 140 140 184 210 280
H1(mm) 68.5 69.5 95 95
H(mm) 100 105 154 154

  • David Jones explains how to replace an electrical panel box. Air handler caused panel box guts to burn up, replaced bad breakers with new bus bar. Bad breakers that burn up doesn’t necessarily mean you have to replace the entire panel box, just the inside breaker switches.

    David Jones of Jones Air Conditioning & Electric
    3920 Progress Ave Suite A5
    Naples, Fl 34104

    3 phase 240 volt 60 amp Square D QO breaker in a single phase box. The Highleg Red, Wildcat leg (208 volts to neutral) directly feeds the 3 phase 3 pole breaker via a wire from the watthour hour meter and NOT a bus bar, like the other two legs do. This config was legal for a new install before 1978 but is grandfathered for existing installs. **If you ever have to replace a breaker like this the input wire is un fused and come directly from the C phase of the 7 jaw watthour meter. Thus massive danger if you let the wire hit the metal case, ie nothing to limit the current except Impedance of the transformer and the wires from gooseneck to the transformer. ie several thousands of amps, maybe 5000 to 8000. The max current with a fault is determined by the wire gauge, length of wire and Impedance of the transformer. (which varies by kVA size of each transformer ).

    The load is a single 5 ton 3 phase AC unit that uses the 240 volts line to line 3 phase. The two bus bars are 120 volts line to neutral, the wild cat red leg is 208 volts line to neutral.

    There can be either 2 or 3 transformers on the power pole for this type of configuration. A High leg delta configuration is still used for new installs and legal but the circuit breaker panel has to be a 3 phase box with 3 bus bars and not a breaker fed by a wire like this one to a “Delta Breaker”.

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