What mechanism holds circuit breaker contacts in the closed position?

The mechanism that holds circuit breaker contacts in the closed position is typically a magnetic latch. This device utilizes electromagnetic forces to create a holding mechanism that keeps the contacts connected, allowing for the flow of electricity through the circuit until a fault occurs or the breaker is deliberately opened.

In a circuit breaker, when power is applied, the magnetic latch is energized and creates a magnetic field that holds the contacts together. This provides both reliability and safety, ensuring that in normal operating conditions, the circuit remains closed. Upon detecting an overload or a fault, the magnetic latch can release, opening the circuit and interrupting power to prevent damage or hazards.

Other mechanisms such as spring mechanisms and hydraulic systems may contribute to different functions within specific types of circuit breakers, but the magnetic latch is the primary component responsible for maintaining the closed state of contacts under normal conditions. Insulated couplings do not pertain to the act of holding contacts in the closed position but rather to the insulation and support of the electrical components.