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Siemens Circuit Breaker: How to choose breaker

Siemens Circuit Breaker: How to choose breaker

Siemens Circuit Breaker: How to Choose Breaker

What to consider when selecting a circuit breaker

1. 1/2" or 1"?
When size and money are driving considerations, Half size breakers are the smart choice.

Duplex Half Size Combo Plug-In Circuit Breakers
2 x 1/2" Breaker
Plug-In Circuit Breaker 1 Pole 10 Amp
1" Breaker

2. 1-pole or 2-pole?
Most circuits require only a 1-pole circuit breaker. That includes lighting, standard outlets and most other applications. For 240-volt applications – clothes dryers, electric ranges, hot tubs and larger air conditioners, for example – you’ll need a 2-pole breaker.

Plug-In Circuit Breaker 1 Pole 10 Amp
1-Pole Breaker
Plug-In Circuit Breaker 2 Pole 20 Amp
2-Pole Breaker

3. What amp rating is required?

A circuit breaker protects the circuit (or wire) between the breaker and the electrical load. It uses a magnetic element (instantaneous unit) to protect against short circuits and a thermal element (bimetal strip) to protect against overloads. It also provides a way to turn a circuit off.

When designing an electrical circuit, the wire is sized to the load it will feed, and the circuit breaker is sized to protect the wire (see table below). Generally, this means that lighting and outlets will call for 15 or 20 amp breakers. Larger motors and air conditioners, clothes dryers and hot water heaters will typically require a 30 amp breaker, while an electric range may need a 50 amp breaker.

Circuit Breaker Amp Rating Wire Size
Copper Aluminum or Copper-Clad Aluminum
15 No. 14 No. 12
20 No. 12 No. 10
30 No. 10 No. 8
40 No. 8 No. 8
50 No. 6 No. 4
60 No. 6 No. 4
70 No. 4 No. 3
80 No. 3 No. 2
90 No. 2 No. 1
100 No. 1 1/0
110 No. 1 1/0
125 1/0 2/0
150 1/0 3/0
175 2/0 4/0
200 3/0 250 MCM
For all Siemens circuit breakers, Click on the links below.
Available in different Amps rating, 1-Pole, 2-Pole, and 3-Pole
Siemens BQ Circuit Breakers
Siemens BQ Circuit Breakers
Siemens ED Circuit Breakers
Siemens ED Circuit Breakers
Siemens QF Circuit Breakers
Siemens QF Circuit Breakers
Siemens BL Circuit Breakers
Siemens BL Circuit Breakers
Siemens Q Circuit Breakers
Siemens Q Circuit Breakers



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