12.F4.S1D-3420 KEB
Wake Industrial LLC is not an authorized distributor of this product.
The 12.F4.S1D-3420 is a frequency inverter manufactured by KEB as part of the F4 Combivert Frequency Inverters series. It features a rated motor power of 4 kW, a nominal output current of 9.5 A, and supports three input phases with a voltage class of 400 V. The unit includes an internal brake transistor and has dimensions of 90 x 250 x 160 mm.
Internal Product Review
The 12.F4.S1D-3420 is a KEB F4 Combivert frequency inverter designed for dependable motor control in 400 V systems. Rated for 4 kW motor power with 9.5 A nominal output current, the unit shows strong drive capacity and stable load handling. An internal brake transistor and 4 kHz switching frequency make this inverter especially well suited for responsive industrial motion applications.
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Product Description:
The 12.F4.S1D-3420 is a three-phase frequency inverter built by KEB for the F4 Combivert Frequency Inverters series. It is installed between the mains and an AC induction motor to modulate voltage and frequency so that conveyor lines, pumps, or machine spindles can be driven at variable speed under PLC control. By varying the electrical output supplied to the motor, it supports controlled acceleration, steady-state running, and speed reduction without mechanical switching. This makes it suitable for equipment that needs repeatable motor control across changing process conditions.
This inverter handles a continuous apparent power of 6.6 kVA within the 400 V voltage class while drawing a nominal input current of 10.5 A and delivering a nominal output current of 9.5 A. This electrical sizing supports standard industrial motors in the same performance range and gives the power stage a clear current envelope during normal operation. When connected to a motor rated at 4 kW, the drive output matches that motor class, and the control trips at 20.9 A during overcurrent events. Physical dimensions of 90 × 250 × 160 mm allow vertical mounting with adequate airflow in typical control cabinets, and the housing fits compact panel layouts used in enclosed machine assemblies.
An insulated gate driver switches at 4 kHz, balancing audible noise and motor heating, while total power loss is limited to 130 W so enclosure cooling remains straightforward. During dynamic deceleration, the internal chopper can pass up to 10 A through the braking resistor, and branch circuit protection is coordinated with a 20 A maximum fuse size. The braking path manages regenerated energy when the motor is slowing, which helps keep DC-bus voltage within the operating range of the power section. This arrangement supports applications with repeated starts, stops, and speed changes where controlled braking is required.
