R912003766 Variable Frequency Drive EFC 3600 4.0kW 3-ф/380

Bosch Rexroth EFC 3600 4.0 kW (part R912003766) is the most powerful model in the series and the only three-phase one: 380V input, 3-phase 380V output, rated current around 9.5 A (3AC 400V class). It targets 3-phase pumps, fans and conveyors on a standard industrial 380V supply.

Scalar V/f control with a user-definable V/f curve, max frequency 400 Hz. The brake chopper is built in — at 4 kW that is comfortably within the integrated chopper range (integrated as standard), leaving only the braking resistor external. RS485/Modbus RTU interface, IP20, no built-in PLC. For a current 4 kW in-stock drive, see our Veichi AC310 (vector + PLC) or the compact AC10 for simple V/f duties.

Bosch Rexroth EFC 3600 Frequency Converter

The EFC 3600 is the economy, compact frequency-converter family from Bosch Rexroth, covering 0.4 to 4 kW. Its philosophy is deliberately simple: scalar V/f control only (there is no vector mode here — sensorless vector arrived in the next-generation EFC 5610). For driving a pump, fan, conveyor or any straightforward constant- or variable-torque load, the EFC 3600 does the job reliably with minimal setup.

What matters in practice

• Brake chopper is built in as standard. The EFC 3600 has the integrated brake chopper as standard across the series range, so every model in this series (up to 4 kW) ships with the chopper on board. The braking resistor itself is an external accessory, sized separately for your inertia and stop cycle (resistor terminals are reserved on the power block).
• Two supply classes. The smaller units take single-phase 200-240V input (1AC 200V class) and deliver a 3-phase 220V motor output; the 4 kW top model takes 3-phase 380-480V (3AC 400V class).
• Max output frequency 400 Hz, V/f control with a user-definable V/f curve for special loads.
• Communication: a standard RS485 port running Modbus RTU (via the RS232/485 adapter). This is the series' base and only native interface — fieldbuses (PROFIBUS, CANopen, EtherCAT) are options/belong to the later x610 generation, so confirm the exact execution by part number.
• Protection class IP20 (cabinet mounting); no built-in PLC in this series — it offers a PID controller and fixed-speed steps.

Availability and alternatives

The EFC 3600 is largely a legacy line, so check stock and lead time by exact part number. If you need a current in-stock drive of the same class, look at our Veichi range: AC10 is a compact V/f converter and a direct task-for-task analogue (pump, fan), while AC310 adds vector control and a built-in PLC for more complex cycles. For ratings and braking-resistor selection, get in touch and we'll size it for your drive.