12.F4.S1D-4003 KEB
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The KEB 12.F4.S1D-4003 is a frequency inverter from the F4 Combivert Frequency Inverters series. It has a maximum rated motor power of 4 kW, supports a nominal input current of 10.5 Amps, and provides an output nominal power of 6.6 kVA. The unit is fitted with a braking transistor and features a maximum heat sink temperature of 73 °C.
Internal Product Review
The 12.F4.S1D-4003 is a KEB F4 Combivert frequency inverter with standard control and a braking transistor. A 9.5 A nominal output current and 4 kW maximum rated motor power give the unit strong capability for consistent drive performance. A 17.1 A maximum short-time current rating further supports dependable overload handling.
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Product Description:
The 12.F4.S1D-4003 is a three-phase frequency inverter manufactured by KEB and released as part of the F4 Combivert Frequency Inverters series. The device converts fixed line voltage into a variable output frequency and voltage, allowing asynchronous motors to accelerate, decelerate, or maintain constant speed in automated machinery. When installed inside a control cabinet, it provides electronic speed regulation without mechanical gear changes, improving process flexibility in material-handling lines, pumps, and general motion tasks. Because the output frequency changes with the command signal, the connected motor can follow process demand more closely than it would on direct line power. This supports equipment that must run at different speeds during normal operation.
The inverter integrates a built-in braking transistor to dissipate regenerated energy during rapid stops. Its control section uses standard open-loop V/f regulation for common industrial drives. This control method is well suited to conveyors, pumps, and other applications that do not require closed-loop servo feedback. Under rated supply conditions, the input current reaches 10.5 A, while the power stage delivers 9.5 A of output current, which corresponds to 6.6 kVA of apparent power. These values support motors up to 4 kW in continuous duty. Circuit protection uses a 20 A line fuse, and power wiring up to 2.5 mm² connects through spring terminals in the D-type housing. The spring-terminal arrangement helps keep wiring compact inside the cabinet. Overall dimensions include a width of 90 mm, and the chassis height reaches 240 mm, which helps it fit standard panel layouts.
The thermal envelope allows a heat sink temperature of 73 °C before derating becomes necessary. The inverter can supply a short-time overload current of 17.1 A for heavy start-up loads, and this extra current helps the motor handle demanding starts without an immediate shutdown. An OC trip activates at 20.9 A to protect the output transistors during fault or overload conditions. The enclosure depth of 160 mm accommodates rear ventilation space while preserving cabinet depth for auxiliary equipment. Adequate airflow behind the unit helps remove heat during continuous operation and supports stable drive performance.
