difference between 2 poles and 1 pole DC circuit breaker ?

Nabiru3
Nabiru3 Registered Users Posts: 13 ✭✭
edited September 2018 in Off Grid Solar & Battery Systems #1
what is the difference between 2 poles and 1 pole DC circuit breaker ?, my knowledge of DC circuit breakers is limited so when I searched and found all different kinds of DC MCB, I got confused as for what to actually get. so can you guys explain to me the differences between 2p and 1p DC MCB (other than the price) ? 
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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #2
    Basically a 2 pole will protect/switch both positive and negative. A single pole would protect/switch one leg, usually the positive in a system where negatives are commoned, such as in a combiner box, they are the most common type used. In some cases the voltage rating changes fom 1 pole 2,3 or 4pole when used in series or series parallel, but this is for use in voltage ranging 550V-1200V. Most people don't work with these voltages so single pole is used, what is the application? 
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,613 admin
    #3
    It is OK to post a link to the breaker(s) that you have questions about...

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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