4P 125A DC Circuit Breaker 320V/500V for Solar & Battery Systems

Description

125A 4 pole DC protection up to 500V.

High-current DC circuits need a breaker rated for direct current. The Projoy PEBS-L-125 (UL1077) 125A 4 pole DC MCB provides overload and short-circuit protection at 320V/500V DC, with 6kA short-circuit capacity and a C tripping curve.

Key Features

• Rated current 125A on a 125A frame
• 4 pole, rated working voltage 320V/500V DC
• Short-circuit capacity 6kA (UL SC 6kA; IEC Icu = Ics = 6kA)
• C tripping curve, thermal-magnetic trip
• Rated insulation voltage 500V, impulse withstand 6kV
• Terminals accept 10 to 50mm² (8 to 1 AWG) at 3.5Nm
• IP40 front, IP20 wiring ports
• Ambient temperature -30°C to +70°C
• 107.2mm wide (26.8mm per pole), 35mm DIN rail mount
• Made to IEC/EN 60947-2, UL 1077, CSA C22.2 No.235 and AS/NZS 60947.2

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Why it Matters

Voltage rises with pole count
Projoy designed the PEBS-L-125 (UL1077) for overload and short-circuit protection in low-voltage DC systems that need higher current capacity. Its rated working voltage depends on the number of poles: 80V/125V DC for 1P, 160V/250V DC for 2P, 240V/375V DC for 3P and 320V/500V DC for 4P. This 4 pole, 125A version carries the highest voltage rating in the series. The series also supports parallel connection of its poles.

Rated to two test regimes
Projoy rates the short-circuit capacity at 6kA under both UL (SC 6kA) and IEC (Icu = Ics = 6kA) testing. Electrical life is 6,000 cycles to UL and 1,500 cycles to IEC, and mechanical life is 10,000 cycles. The breaker operates from -30°C to +70°C at elevations up to 2000m.

Switchboard fit and wiring
The breaker clips onto 35mm DIN rail and measures 107.2mm wide, 89.0mm long and 75.5mm high, weighing 0.17kg per pole. For the 125A rating, Projoy's harness specification lists 50mm² (1 AWG) copper conductors tightened to 3.5Nm. The front is IP40 and the wiring ports are IP20.

Q: What DC voltage is the Projoy PEBS-L-125 125A 4 pole breaker rated for?
A: The 4 pole version has a rated working voltage of 320V/500V DC. Its rated insulation voltage is 500V and its impulse withstand rating is 6kV.

Q: What cable size suits the 125A PEBS-L-125 (UL1077)?
A: Projoy's harness specification lists 50mm² (1 AWG) copper conductors for 125A, tightened to 3.5Nm. The terminals accept conductors from 10 to 50mm².

Q: Which tripping curve does this breaker use?
A: This model has a C tripping curve with a thermal-magnetic trip. The PEBS-L-125 (UL1077) series is also offered with a B curve.