Circuit Breakers
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 GE THP3030SSFC Circuit Breaker Houston Style Drawout  US $28,000.00
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 SQUARE D CIRCUIT BREAKER 4000 AMP NW40H WITH LITTLE USE US $28,000.00
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 SQUARE D CIRCUIT BREAKER 5000 AMP NW50H WITH LITTLE USE US $28,000.00
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 GE TP3030SSFC circuit breaker Houston Style Drawout TP3030SSFC US $25,000.00
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 Westinghouse Circuit Breaker PCCG33000F US $24,000.00
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 GE AKD 8 Switchboard with 8 Circuit Breakers US $24,000.00
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 GE THC3030SSZE1C circuit breaker 3000 amp PowerBreak US $23,500.00
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 GE AKD 8 Switchgear with 10 Circuit Breakers US $23,000.00
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 ITE CIRCUIT BREAKER HS3B40000S01 USED FULLY TESTED US $22,000.00
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 Square D NW30H 3000A Circuit Breaker WL3HHB44A9SXXXXXXA US $20,425.00
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 Square D Masterpact Circuit Breaker NW40H2 4000A Frame D O W Micrologic 60A US $20,000.00
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 SQUARE D CIRCUIT BREAKER 3000 AMP SEF363000LS US $20,000.00
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 CUTLER HAMMER CIRCUIT BREAKER 3P 2500 AMP 600V PCG32500F US $19,900.00
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 E3S A32 Circuit Breaker PR122 P LSIG ABB SACE 3200A NEW US $18,700.00
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 EATON CUTLER HAMMER 150VCP TR25 vacuum circuit breaker US $18,500.00
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 UNUSED GE POWER BREAK II SHD40B440 4000 CIRCUIT BREAKER US $15,500.00
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 GE TC3030SSE1 circuit breaker 3000 amp PowerBreak US $15,500.00
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 ITE SIEMENS 4000A CIRCUIT BREAKER SBS4040F USED US $15,000.00
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 Square D Masterpact Circuit Breaker NW32H1 3200A Frame D O W Micrologic 60A US $15,000.00
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 ABB 15 KV OUTDOOR SUB STATION CIRCUIT BREAKER US $15,000.00
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 McGRAW EDISON SF6 38KV 38 KV VACUUM CIRCUIT BREAKER US $15,000.00
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 CUTLER HAMMER 480Y 277V SPB 100 4000A CIRCUIT BREAKER US $14,500.00
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 WESTINGHOUSE SPB 100 5000A POW R CIRCUIT BREAKER W LSIG US $14,500.00
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 TCVVF9640E1 GENERAL ELEC 4000 AMP CIRCUIT BREAKER US $14,400.00
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 UNUSED SQUARE D SED361600LSG 1600A CIRCUIT BREAKER NIB US $14,000.00
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 Used Westinghouse PCCG33000F 3000 Amp Circuit Breaker US $14,000.00
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 ITE Siemens HNX3U800 Circuit Breaker US $14,000.00
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 Siemens SHPD69160 Circuit Breaker 1600 Amps NEW US $13,999.99
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 ITE CND63B120H Circuit Breaker 1200 Amps NEW US $13,999.99
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 SED361600LSGES1 SQUARE D Circuit Breaker 1600A LSIG EO US $13,500.00
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 MP08H2 Merlin Gerin Circuit Breaker 800A 200K STR308S US $12,500.00
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 5000 AMP MDSC50 MAGNUM CIRCUIT BREAKER W PROGRAMMER US $12,500.00
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 Westinghouse Circuit Breaker SPB100 3000A EO BO US $12,500.00
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 Westinghouse PB32500F 1600 Amp Circuit Breaker New Surplus US $12,500.00
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 SQUARE D PEF362000LIZ Circuit Breaker QED Switchboard US $12,500.00
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 CUTLER HAMMER SPB 100 SPBR340R 4000 A CIRCUIT BREAKER US $12,500.00
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 Square D 3000 Amp Insulated Case Circuit Breaker Model NW 30H US $12,000.00
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 SQD Square D NE361200LSG Circuit Breaker US $12,000.00
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 GE AK 1 100 power air circuit breaker US $11,900.00
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 TCVVF9640 GENERAL ELEC 4000 AMP CIRCUIT BREAKER US $11,700.00
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 UNUSED SIEMENS CUBICLE BUS WLL3A340 CIRCUIT BREAKER US $11,000.00
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 New SIEMENS ITE LNX3B120 1200 Amp 3P Pole 600 Volt Circuit Breaker 1200A phase US $10,750.00
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 PEF361200LSG SQUARE D Circuit Breaker 1200A LSIG 100K US $10,500.00
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 Used Westinghouse PCCG32000F 2000 Amp Circuit Breaker US $10,500.00
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 SPD69160G Siemens 1600 A Circuit Breaker with GF NEW US $10,500.00 |
 SQUARE D 1000A 3P CIRCUIT BREAKER MHF321000 U 207 US $9,650.00
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 3000Amp Cutler Hammer MDSC Circuit Breaker US $9,550.00
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 Used Cutler Hammer MDSC30 3000 Amp Circuit Breaker US $9,500.00
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 MERLIN GERIN MP40H1 4000A MASTERPACT CIRCUIT BREAKER US $9,200.00
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 Cutler Hammer 2500 AMP SPB100 Circuit Breaker SPB 100 US $9,000.00
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 GE Powerbreak II SSF30D330 3000 Amp Circuit Breaker US $9,000.00
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 Used Square D RKF36250CU41DE1SA 2500 Amp 3 Phase Circuit Breaker US $9,000.00
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What kind of circuit breakers are needed for commercial buildings?
I have a school project to do involving 120/208V 3 phase wiring.
What kind of circuit breakers would an AC and baseboard heater require?
They are both rated above 20 Kw. Would it be 3 pole? This is what is confusing me...Ive only done residential projects with single and double pole breakers.
3-pole - 120/208 is 3 phases - each 120volt, measuring 208V btwn any two phases.
In a 3 phase installation - the neutral is not used as part of the appliance operation - only to ground the appliance cabinet for safety.
The neutral is used for operating appliances using 120V - single phase.
120/208V single phase only uses the neutral for grounding
3 phase 208V - 20KW, (20,000 watts) would require a triple pole breaker and the neutral would be used as a ground, for the cabinet, for safety. In a commercial building the smallest breaker is 20 amp.
Residential homes are supplied with 120/240V, single phase service, due to the smaller size appliances. The smallest size breaker is 15 amp.
Many A/C units are 208V - 3 phase when the unit is 7-1/2 ton or larger. The 3 phase unit would, of course, be fused with a triple breaker.
Baseboard units are usually 120/208 -1 phase - due to the maximum wattage assigned to electric baseboard units. There can be some 3-phase, and it would require a 3 pole breaker but, most are 1 phase since it is necessary to distribute a number of baseboard units in an area to spread the heat rather than have 1 large unit in one place. Unless a large 3 phase unit is in the center of the area ,and fans are used for distribution, the area would be uncomfortable.
Wattage is divided by the voltage to select the breaker size.
1 - 20 KW unit at 120V would require a minimum of 1- 200 amp breaker and very large wire and not be efficient and not operate due to a severe imbalance in the Power Company transformer ..
1 - 20 KWunit at 120/1208V single phase would require 2 - 100 amp breakers and large wire and not be efficient.
1 - 20 KW unit at 208V three phase would require 3 - 60 amp breakers and smaller wire and be more efficient.
Bottom line:
120V operation - 1 pole breaker.
120/208V single phase operation - 2 pole breaker.
208V - 3 phase operation - 3 pole breaker.
Circuit Breakers
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