12.B4.C1D-3420 KEB
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The KEB 12.B4.C1D-3420 is part of the B6 Combivert Frequency Inverters series and supports a 3-phase 400V AC/DC input power configuration. It features a heat sink cooling system, an installed braking transistor, and offers a maximum rated motor power of 4 kW with an output rated current of 9.5 Amps.
Internal Product Review
The 12.B4.C1D-3420 is a KEB B6 Combivert frequency inverter designed for 3-phase 400V AC/DC input and rated for 4 kW motor power. Heat sink cooling and a standard NPN control interface support straightforward integration and stable thermal performance. The included GTR7 braking transistor is especially beneficial in dynamic drive applications, backed by a 10 A maximal braking current.
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Product Description:
The 12.B4.C1D-3420 variable-speed drive is manufactured by KEB and belongs to the B6 Combivert Frequency Inverters series. By rectifying and inverting line power, the unit supplies adjustable voltage and frequency to three-phase motors, so fans, conveyors, and other industrial equipment can run at the speed the process requires instead of a fixed synchronous rate. This allows connected machinery to accelerate, hold speed, and decelerate under electronic control rather than fixed line frequency alone. The unit fits automation panels where motor speed must follow process demand from external control signals. Its integrated control terminals link the inverter with standard PLC I/O for incorporation into industrial automation panels.
The inverter is designed for a three-phase 400 V AC/DC supply, which permits direct connection to common factory mains or a shared DC bus. During operation, it can deliver up to 6.6 kVA of apparent power, and the corresponding continuous output current is 9.5 A. The drive can run motors up to 4 kW without derating, provided heat is removed through the rear heat-sink cooling system. KEB assigns this unit to size 12, which indicates the mounting hole pattern, terminal spacing, and allowable conductor cross-section. The control interface uses sink-type logic inputs so external contacts can command start, stop, and jog functions without additional relays. Because the heat sink forms the rear of the enclosure, thermal energy can be transferred out of the power section without adding a separate cooling assembly.
Dynamic deceleration is handled internally because the drive includes a GTR7 braking transistor that diverts excess DC-link energy into an external resistor. With a typical resistor value of 150 Ω, the unit can absorb regenerative surges while limiting component temperature. The braking circuit is rated for a peak of 10 A, which matches short-term torque demands during rapid stops of high-inertia loads. That arrangement lets returned energy from the motor be dissipated electrically during braking instead of depending only on mechanical friction. The cooling heat sink removes switching losses from both the inverter section and the braking transistor.
