Abb breaker stun opener snd stun closer

It seems like you're referring to some technical terms related to electrical power systems!

Here's a breakdown of what each term might mean:

1. ABB: ABB is a Swedish-Swiss multinational corporation that specializes in power and automation technologies. In this context, it's likely referring to an ABB breaker, which is a type of electrical breaker or switchgear manufactured by ABB.
2. Breaker: An electrical breaker is a device that interrupts the flow of electrical current in a circuit when it exceeds a certain threshold or when a fault is detected. Breakers are designed to protect people, equipment, and the electrical grid from damage caused by electrical overloads or short circuits.
3. Stun opener: A stun opener is a type of electrical breaker that is designed to open (or trip) when it detects a fault or overload in the electrical circuit. The term "stun" refers to the sudden and brief interruption of the electrical current, which is intended to prevent damage to the equipment or the electrical grid.
4. Stun closer: A stun closer is a type of electrical breaker that is designed to close (or reset) the circuit after a fault or overload has been cleared. The term "stun" refers to the brief interruption of the electrical current, which is intended to prevent damage to the equipment or the electrical grid.

In summary, an ABB breaker stun opener is a type of electrical breaker that opens (trips) when it detects a fault or overload, while a stun closer is a type of electrical breaker that closes (resets) the circuit after the fault or overload has been cleared.