VT-VRPA1-537-20/V0 Bosch Rexroth Indramat
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MPN: 811405062
The Bosch Rexroth Indramat VT-VRPA1-537-20/V0 is part of the VT-VRPA Electric Amplifiers series and has a nominal supply voltage of 24 VDC. This amplifier features a typical power consumption of 55 watts, supports a maximum solenoid current of 3.7 amps, and uses a DIN 41612-F32 connector. The unit measures 160 mm by 100 mm and weighs 0.37 kilograms.
Internal Product Review
The VT-VRPA1-537-20/V0 is a Bosch Rexroth Indramat electric amplifier designed for precise valve control with a nominal 24 VDC supply and 60 VA maximum solenoid power. Technical integration is especially appealing thanks to a 100 kΩ command input resistance and a DIN 41612-F32 connector, supporting clean signal handling and straightforward panel installation. A maximum solenoid current of 3.7 A gives this amplifier strong output capability for dependable electrohydraulic performance.
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Product Description:
The VT-VRPA1-537-20/V0 is an electric amplifier card produced by Bosch Rexroth Indramat within the VT-VRPA Electric Amplifiers series. Mounted in a modular rack beside proportional valves, the unit translates low-level command signals into regulated coil current so that hydraulic actuators follow the setpoints issued by a machine controller. At only 0.37 kg, the card adds minimal mass to control cabinets while providing the drive and feedback conditioning needed for precise pressure and flow regulation in industrial automation. Its rack-mounted format also keeps the control electronics close to the connected hydraulic equipment, which helps simplify signal routing within the enclosure.
The amplifier operates from a nominal supply of 24 VDC and draws up to 2.7 A under maximum loading. Its input stages have a feedback impedance of 20 kΩ and a command impedance of 100 kΩ, allowing high-accuracy transducers and PLC outputs to connect without excessive signal loading. When energized, the power stage can deliver up to 60 VA to the valve coils for controlled solenoid actuation. An error relay path supplies up to 100 mA to signal fault states, while a dedicated potentiometer circuit provides 10 mA to keep external setpoint dials stable as temperatures change. These separate signal paths allow the amplifier to process commands, monitor actual values, and report operating faults through the rack connection.
The current loop can reach 3.7 A to operate high-force proportional solenoids. Auxiliary reference rails provide ±10 V for onboard potentiometers and ±15 V for external displacement transducers, giving connected devices dedicated voltage sources for command and feedback functions. Normal operation typically consumes 55 W, keeping heat generation manageable within a properly ventilated control enclosure. The board measures 160 mm by 100 mm, uses a 7 TE front plate, and connects through a DIN 41612-F32 plug that carries both signal and power contacts. This Eurocard format allows the amplifier to fit standard 19-inch rack frames without additional mechanical supports.
