12.B6.A3B-3900 KEB
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The KEB 12.B6.A3B-3900 is part of the B6 Combivert Frequency Inverters series and features a three-phase 400V AC/DC input power configuration. It supports a maximum rated motor power of 4 kW and offers an output rated current of 9.5 Amps. This inverter includes a standard PNP control interface, a heat sink cooling system, and comes equipped with a braking transistor and internal filter as installed accessories.
Internal Product Review
The 12.B6.A3B-3900 is a KEB B6 Combivert frequency inverter with 3-phase 400V AC/DC input and heat-sink cooling. Standard PNP control and an integrated braking transistor with internal filter support straightforward commissioning and stable drive response. A 9.5 A rated output current makes the unit an appealing choice for consistent motor control.
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Product Description:
The 12.B6.A3B-3900 is a frequency inverter from KEB and belongs to the B6 Combivert Frequency Inverters series. It converts fixed mains power into variable voltage and frequency output so an AC motor can be driven at controlled speed and torque in automated machinery. The unit’s encoded housing type B and integral heat-sink cooling align with cabinet mounting practices common in conveyors, pumps, and packaging stations. Installed braking hardware and an internal filter are already included to simplify panel wiring. This arrangement supports compact installations where direct cabinet mounting and controlled deceleration are required.
Electrical ratings show where the inverter fits into a drive system. It accepts a 3-phase 400 V AC/DC supply and uses a control interface set to standard PNP logic. Inverter size code 12 places the unit in the medium power segment of the series and pairs with motors up to 4 kW. When fully loaded, the drive can deliver an output current of 9.5 A, translating to continuous apparent power of 6.6 kVA at the default 4 kHz switching frequency. The heat-sink cooling path evacuates semiconductor losses without external fans, maintaining performance inside sealed enclosures. An internal filter attenuates conducted emissions, and the integrated GTR7 braking transistor provides direct energy dissipation when rapid deceleration is requested.
Transient events are managed by the drive’s current ceiling and brake components. The controller permits an overcurrent excursion of 216% for fault detection yet restricts repetitive surges to a short-time limit of 180% to protect the IGBTs. During dynamic braking, the GTR7 path can conduct up to 10 A, and a typical external resistor of 150 Ω converts regenerative energy into heat. With the internal filter active, leakage toward protective earth remains within 6 mA, allowing the inverter to operate on standard residual-current devices without nuisance trips. This behavior helps the drive manage regenerated energy during speed changes and stop sequences.
