Siemens Shunt Trip Breaker Wiring Diagram

Siemens is a well-known brand in the electrical industry, and one of their popular products is the shunt trip breaker. This circuit breaker has a built-in shunt trip mechanism that allows you to remotely trip the breaker using a switch. In this article, we will discuss the wiring diagram for the Siemens shunt trip breaker and provide some frequently asked questions.

Wiring Diagram

The wiring diagram for the Siemens shunt trip breaker is straightforward, but it’s important to follow the instructions carefully to ensure proper installation. The shunt trip breaker has four terminals, labeled A1, A2, S1, and S2. Terminal A1 is the line side of the breaker, and terminal A2 is the load side. Terminals S1 and S2 are for the shunt trip mechanism.

Step 1: Turn off the Power

Before starting any wiring work, always turn off the power to the circuit you are working on. This can be done by flipping the circuit breaker to the “off” position or by turning off the main power switch.

Step 2: Connect Power Wires

Connect the power wires to terminals A1 and A2. The black or red wire from the power source should be connected to terminal A1, and the black or red wire that goes to the load should be connected to terminal A2. The white neutral wire should be connected to the neutral bar.

Step 3: Connect Shunt Trip Wiring

The shunt trip mechanism requires a separate power source from the main circuit. This is typically a low-voltage control circuit that is powered by a separate transformer. Connect the wires from the transformer to terminals S1 and S2. The wiring should be appropriately sized for the transformer and the shunt trip mechanism.

Step 4: Connect Switch Wires

The switch that controls the shunt trip mechanism must be connected to terminals S1 and S2. This switch can be a push button, toggle switch, or any other suitable device. The wires from the switch should be connected to the appropriate terminals according to the wiring diagram provided with the breaker.

Step 5: Test the Breaker

After all the wiring is complete, turn on the power and test the breaker. To test the shunt trip mechanism, press the switch that controls it. This should trip the breaker and disconnect the power to the load.

FAQ

Question Answer
What is a shunt trip breaker? A shunt trip breaker is a circuit breaker with a built-in mechanism that allows it to be tripped remotely using a switch.
What is a shunt trip mechanism? A shunt trip mechanism is an electrical device that trips a circuit breaker by sending a signal to an electromagnet within the breaker.
What is the difference between a shunt trip breaker and a regular breaker? A shunt trip breaker has a built-in shunt trip mechanism that allows it to be tripped remotely, while a regular breaker can only be tripped manually.
What is the purpose of a shunt trip breaker? A shunt trip breaker is used in applications where it is necessary to quickly disconnect power to a circuit remotely, such as in emergency situations or for maintenance purposes.

Conclusion

The wiring diagram for the Siemens shunt trip breaker is simple and easy to follow, but it’s important to ensure that the wiring is done correctly to avoid any potential hazards. By following the instructions provided in this article and consulting the wiring diagram that comes with the breaker, you can safely and effectively install a shunt trip breaker in your electrical system.