Keeping your grid reliable has never been more important. With the power usage patterns shifting dramatically in these challenging times, power operators need to do make everything they can to avoid outages.
The VM5-320HUL is a dual-break MCCB designed for photovoltaic, wind power and energy storage systems, with rated current up to 320A, rated working voltage up to AC1000V and breaking capacity up to 30kA. It is designed to withstand humidity, condensation and temperature changes.
The VM5-320HUM is a dual-break MCCB designed for photovoltaic, wind power and energy storage systems, with rated current up to 320A, rated working voltage up to AC1000V and breaking capacity up to 50kA. It is designed to withstand humidity, condensation and temperature changes.
The VM5-630HUL is a dual-break MCCB designed for photovoltaic, wind power and energy storage systems, with rated current up to 630A, rated working voltage up to AC1000V and breaking capacity up to 50kA. It is designed to withstand humidity, condensation and temperature changes.
The VM5-630HUM is a dual-break MCCB designed for photovoltaic, wind power and energy storage systems, with rated current up to 630A, rated working voltage up to AC1000V and breaking capacity up to 50kA. It is designed to withstand humidity, condensation and temperature changes.
The VM3-250HUL is a 3P MCCB designed for photovoltaic, wind power and energy storage systems, with rated current up to 250A, rated working voltage up to AC800V and breaking capacity up to 30kA. It is designed to withstand humidity, condensation and temperature changes.
The VM3-250HUM is a 3P MCCB designed for photovoltaic, wind power and energy storage systems, with rated current up to 250A, rated working voltage up to AC1000V and breaking capacity up to 40kA. It is designed to withstand humidity, condensation and temperature changes.
The VM3-250HUH is a 3P MCCB designed for photovoltaic, wind power and energy storage systems, with rated current up to 250A, rated working voltage up to AC800V and breaking capacity up to 50kA. It is designed to withstand humidity, condensation and temperature changes.
The VM3-630HUL is a 3P MCCB designed for photovoltaic, wind power and energy storage systems, with rated current up to 400A, rated working voltage up to AC1000V and breaking capacity up to 36.5kA. It is designed to withstand humidity, condensation and temperature changes.
Q: Which VOZWEI MCCB series are available?
A: VOZWEI offers the VM3 and VM5 MCCB families with In from 63A to 630A across eight 3P series. VM3-250 frames cover 63A–250A, VM3-630HUL spans 200A–400A, VM5-320 covers 63A–320A and VM5-630 spans 315A–630A, all with Icu up to 50kA at AC800V and Uimp 8.0kV.
Q: What are the main differences between VOZWEI VM3 and VM5 MCCB families?
A: VOZWEI VM3 and VM5 MCCBs differ mainly in frame range and adjustment capability. VM3 spans 63A to 400A with fixed thermal and magnetic (10In); VM5 spans 63A to 630A with adjustable thermal (0.7 to 1.0In) and magnetic trip up to 10In (fixed at 10In on the 63A rating).
Q: What do L, M, H suffixes mean on VOZWEI VM3 and VM5?
A: On VOZWEI VM3 and VM5 MCCBs, the trailing letter marks breaking capacity grade from L (lowest) to H (highest). For example, the VM3-250HUL is 30kA at AC800V, the VM3-250HUM is 40kA and the VM3-250HUH is 50kA, all at In 63A–250A.
Q: Which VOZWEI VM3 or VM5 MCCB suits AC800V or AC1000V?
A: For AC800V or AC1000V solar collection circuits, choose a VOZWEI MCCB rated AC800/1000V such as the VM3-630HUL (Icu 36.5kA at AC800V, 15kA at AC1000V), VM5-320HUM or VM5-630HUM. Match In from 63A to 630A, then pick the L, M or H grade so Icu exceeds the prospective fault current.
Q: Can VOZWEI VM3 or VM5 MCCBs be used on PV DC side?
A: No. VOZWEI VM3 and VM5 MCCBs are AC-only breakers with no DC rating and must not be used in PV DC strings. Their working voltages are AC800V or AC800/1000V; apply them on the inverter AC output and AC feeders, not on DC circuits.
Q: What does Icu mean on VOZWEI VM5-320HUM at AC800V?
A: On the VOZWEI VM5-320HUM MCCB, Icu is the rated ultimate short-circuit breaking capacity: 50kA at AC800V and 30kA at AC1000V. Breaking capacity falls as voltage rises, so always verify Icu at the actual system voltage.
Q: Which applications suit VOZWEI VM5 MCCB series?
A: The VOZWEI VM5 MCCB series suits solar, wind and energy storage AC systems at AC800V or AC1000V, In 63A to 630A. Frames resist damp heat, condensation, high-low cycling and high altitude, and add adjustable thermal (0.7 to 1.0In) and magnetic trip up to 10In (63A rating uses fixed 10In).
Q: When should I choose VOZWEI MCCB over a VOZWEI VW3 ACB?
A: Choose a VOZWEI VM3 or VM5 MCCB for feeders and sub-mains up to In 630A without drawout maintenance; choose a VOZWEI VW3 ACB for main incomers. VW3 ACBs span 200A–6300A with breaking capacity up to 85kA at AC800V and add fixed or drawout mounting.