Master pact circuit breakers - Schneider Electric

This section describes Schneider Electric Masterpact® series circuit breakers

Table 1. Circuit breakers in Schematic Editor
component component dialog window component parameters

Single phase circuit breaker

Two phase circuit breaker

Three phase circuit breaker

  • General
    • RtC on delay
    • RtC off delay
    • Closed delay
    • Open delay
    • Initial state
  • Output
    • Feedback output
    • Signal type

Breaker properties are described in Table 2.

Table 2. Circuit breaker properties
Group Name Description
General RtC on delay On delay
RtC off delay Off delay
Closed delay Close delay
Open delay Open delay
Initial state Breaker initial state
Output Output signals type Choose the type of output signals
Input to the circuit breaker component is a Signal Processing signal of length 2:
  1. First signal is used as an ENABLE signal for the breaker
  2. Second is used as ON signal for the breaker
Output of the circuit breaker is a Signal Processing signal of length 4:
  1. First signal is the RTC (Ready To Close) feedback from the breaker
  2. Second signal is the CLOSED feedback from the breaker
  3. Third signal is the TRIPPED feedback from the breaker
  4. Fourth signal is the breaker On/Off feedback

The picture below illustrates the proper way to connect breakers signals. In the example digital inputs and outputs are used.

Figure 1. Circuit breaker wiring

Circuit breaker model

From the electrical circuit point of view circuit breaker element is modeled as an ideal switch. Switch state is defined by a control FSM (Finite State Machine) block (Figure 2). The control FSM features two user-defined control inputs, enable (en) and on. The output signal “closed” controls the ideal switch. There are two additional output signals used to feed back the circuit barker state: ready to close (rtc) and tripped.

Figure 2. Circuit breaker block diagram
Figure 3. MP Circuit breaker timing diagram

The Control FSM function is defined by the state diagram in Figure 4.

Figure 4. MP Circuit Breaker Control FSM function
Note: All outputs are implemented as active high. If outputs are used as a feedback in active low form, the Digital output invert feature from HIL SCADA can be used.