YFM2LE Residual Current Action Protection Circuit Breaker (Iintelligent type)

• Residual  current  protection  function

• Set the working mode

  Leakage current action value:greater than 0.751△

  Leakage current inactive value:less than 0.51△。

  Leakage current alarm value:greater than or equal to 0.61△

  Operation time:0.5s(Max  disconnect  time)

• Automatie tracking mode

Automatic tracking shift conditions:

Downshift:less than 0.5l.for 2 minutes

Up-shift: greater than 0.5l., and for 1 minute

In automatic tracking mode, power on initially works in the highest gear. When the gear down condition is met, that is, the actual remaining current is less than 0.5 times of the value of the next gear and lasts for 2 minutes, the gear will be automatically adjusted to the next gear. When the condition of gear adjustment is met, that is, the actual remaining current is greater than 0.5 times of the value of the gear and less than 0.75 times for 1 minute, the gear will be adjusted to the upper gear.

In a certain gear (except the maximum gear) when the remaining current is greater than 0.75 ln, the switch delay action is opened, the action time is referred to the fixed working mode action time, and the gear is raised to the upper gear aiterre-closing.

• Performance index

Residual current measurement accuracy: error less than +5%

Residual current protection accuracy: error less than +10%

Operation time accuracy: +10%

• Overload long delay protection function

The overload long delay protection function is generally used to protect the cable from overload, which is based on the true effective value(RMS) of the current.

Overload long delay related setting parameters and characteristics

Overload long dalay trip setting current l:

250A frame:(100A,125A,140A,160A,180A,200A.225A.250A)+OFF

630A frame:(200A,225A,250A315A,350A,400A.630A)+0FF 

Overload longdelay setting time :3-18s

overload operating range:

s1.05lR,no action within 2 hours

I>1.3lR,action within 1 hour

Operation current accuracy: +10%

Operation time accuracy: ±10%

• Rated current 250A long delay operation schedule

• Rated current 630A long delay operation schedule

• Rated limit short-circuit breaking capacity

• Short circuit instantaneous protection function

The instantaneous protection function prevents the solid short circuit of the distribution system, which is generally an interphase fault, and the short circuit current is relatively large and needs to be quickly disconnected. This protection is based on current true effective value (RMS) prolection. Short circuit instantaneous related setting parameters and characteristics. Short circuit instantaneous trip setting current l, = 4~14In+ОFF

• Short-circuit instantaneous action characteristics: ls 0.8l, no action; l>1.2 l. action.Operating current accuracy +10%

Operation time Ts200ms