Overview
The Rexroth GP45B4-A proportional valve solenoid is a precision electric-hydraulic actuator engineered for proportional directional control and flow metering in industrial hydraulic systems. This solenoid functions as an electric-mechanical transformer within proportional control amplifier circuits, converting low-voltage command signals into proportional mechanical force for accurate valve spool positioning and control.
Key Features
- Rated current: 1.5A DC at 5.4 O-M specification
- ISO4400 standard solenoid socket for industry-standard integration
- Built-in over-current protection to prevent burnout under fault conditions
- Proportional force output directly proportional to input current (≥0.1A minimum)
- Suitable for continuous-duty industrial hydraulic systems
- Compatible with Bosch Rexroth proportional control amplifiers
Technical Specifications
The following specifications are based on manufacturer documentation for the GP45B4-A series:
- Rated Current: 1.5A DC
- Coil Specification: 5.4 O-M
- Socket Standard: ISO4400
- Protection: Over-current protection (integrated)
- Duty Cycle: Continuous
- Control Type: Force-controlled proportional solenoid
- Fluid Compatibility: Mineral oil, phosphoric acid oil
- Manufacturer: Bosch Rexroth AG (Germany)
Typical Applications
- Proportional directional control valves in mobile and industrial hydraulics
- Flow control and metering in automated machinery
- Pressure control in high-precision hydraulic systems
- Machine tool servo systems requiring infinite speed variation
- Construction and mining equipment proportional valve actuation
- Industrial automation requiring closed-loop or open-loop proportional control
Compatibility & Replacements
Compatible With
- Bosch Rexroth proportional control amplifier modules
- Rexroth proportional directional control valves (4/3, 4/2 configurations)
- Rexroth proportional pressure relief and flow control valves
- Electric-hydraulic systems operating 12V or 24V DC
- ISO4400-standard solenoid mounting interfaces
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The GP45B4-A directly replaces equivalent Rexroth solenoids in the same performance class. Common related part numbers in this family include GP45A4-A and GP45-4-A, though specifications should be confirmed with Rexroth documentation.
Works With
- Bosch Rexroth proportional valve design software and selection tools
- Industrial proportional control amplifier cards (IW9 series compatible)
- Proportional spool feedback systems (LVDT, magnetostrictive)
- Rexroth catalog documentation and technical bulletins
- Third-party PLC and motion control systems via amplifier interface
