What's the difference between 2-pole and 3-pole breaker disconnects?
I'm wondering what the difference of 2-pole and 3-pole disconnect is. For example this square d QO200TR product is 2-pole, but I don't know what it refers to. Thanks for your answers.
Comments
You can install fuses to fusible disconnects, unlike the non-fusible ones in which the breakers do that job. The one disconnect you mentioned -QO200TR- is a non-fusible disconnect. You'll see the breakers.
Here is the electrical drawing difference of fused disconnect and the breakers.
Thanks for your question waco.
The 2-pole breakers are used for single phase ac circuits where there is an L1, L2 and N wire. The 3-pole breakers are used for three-phase circuits where there is L1, L2, L3 and N wire.
Normally, any residential users may use 120/240V single phase system, therefore they'd need 2-pole. The difference between two 120V wires is 240V, that's why the voltage rating is 240V.
Thank you! One more question;
What does fusible and non-fusible mean?