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HED8OH-1050K14AS
HED8OH-1050K14AS
HED8OH-1050K14AS

Rexroth HED8OH-1050K14AS Pressure Switch

  • Model: HED8OH-1050K14AS
  • Brand: Bosch Rexroth
  • Series: HED 8 OH
  • Core Function: Converts hydraulic pressure into an electrical switching signal
  • Product Type: Hydraulic-mechanical pressure switch / pressure relay
  • Sensing Principle: Piston-operated mechanical pressure switching
  • Adjustment Range: 10–50 bar*
  • Electrical Output: Micro-switch, NO/NC contact function*
  • Electrical Connection: K14, 4-pole connector configuration*
  • Protection: IP65 reported by secondary source*
  • Condition: Verify New Original / New Surplus condition with supplier before purchase

*Exact configuration data for HED8OH-1050K14AS is not fully documented in the public Bosch Rexroth records located during research. The values marked above are based on secondary documentation and should be checked against the unit nameplate and applicable Rexroth data sheet. Related HED 8 OH K14 models use DIN EN 175301-803 connectors and potential-free NO/NC micro-switch contacts.

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Description

Key Technical Specifications

Parameter HED8OH-1050K14AS
Manufacturer Bosch Rexroth
Product Family HED 8
Type HED 8 OH
Function Hydraulic pressure switching
Pressure Adjustment Range 10–50 bar*
Pressure Sensing Piston type
Electrical Switching Micro switch, NO/NC
Connector K14
Connector Standard DIN EN 175301-803 for related HED 8 OH K14 versions*
Hydraulic Seal NBR on related HED 8 OH versions*
Hydraulic Fluids HL, HLP, HLPD, HVLP, HVLPD on related versions*
Maximum Switching Current 2.0 A on related HED 8 OH versions*
Supply / Switching Voltage 12–250 V AC/DC on related versions*
Pressure Family HED 8 OH

Bosch Rexroth’s documented HED 8 OH family includes piston-type pressure switches with a micro-switch providing normally open/normally closed contact functionality. Related K14 versions support 12–250 V AC/DC and switching currents from 1 mA to 2.0 A.

The exact HED8OH-1050K14AS suffix is important. Do not substitute a visually similar HED 8 OH model solely because its pressure range or connector appears compatible. The 1050 and K14AS portions define configuration details that should be matched against the installed device.

 

Product Introduction

The Rexroth HED8OH-1050K14AS is a hydraulic pressure switch designed to convert a defined hydraulic pressure condition into an electrical switching signal. The HED 8 OH family uses mechanical piston actuation and a micro-switch arrangement for pressure-dependent control functions.

Its typical role is pressure monitoring, pump control, sequence control, alarm generation, unloading, or protective shutdown. For replacement work, verify the pressure adjustment range, K14 electrical configuration, hydraulic connection, seal material, and installed control-circuit voltage before ordering.

HED8OH-1050K14AS

HED8OH-1050K14AS

HED8OH-1050K14AS

HED8OH-1050K14AS

Installation & Configuration Guide

Stage 1 — Pre-Installation Preparation

Estimated time: 15–30 minutes

  1. Apply LOTO to the hydraulic power unit and associated electrical control circuit.
  2. Confirm that hydraulic pressure has fallen to a safe level before disconnecting the switch.
  3. Record the existing pressure setting and photograph the hydraulic and electrical connections.
  4. Verify the replacement marking: HED8OH-1050K14AS.
  5. Check the existing connector, hydraulic interface, seal condition, and pressure range.
  6. Prepare suitable wrenches, sealing components, electrical test equipment, and cleaning materials.
  7. Keep the removed pressure switch until the replacement has passed functional testing.

⚠️ Do not loosen the hydraulic connection while the circuit remains pressurized.

Stage 2 — Removing the Existing Pressure Switch

Estimated time: 10–20 minutes

  1. Confirm zero or safely isolated hydraulic pressure.
  2. Disconnect the electrical connector without pulling on the cable.
  3. Mark the conductors if the existing wiring is not keyed or otherwise clearly identified.
  4. Remove the pressure switch using the appropriate tool.
  5. Inspect the hydraulic interface for contamination, damaged threads, or damaged sealing surfaces.
  6. Compare the removed unit with the HED8OH-1050K14AS before installation.

⚠️ Do not force the switch if the hydraulic connection does not match.

Stage 3 — Installing the New Module

Estimated time: 15–30 minutes

  1. Clean the mounting/interface area before installation.
  2. Install the correct seal specified for the particular HED 8 configuration.
  3. Mount the pressure switch in the correct orientation.
  4. Tighten the hydraulic connection according to the applicable Rexroth installation specification.
  5. Reinstall the K14 electrical connector.
  6. Verify that wiring corresponds to the required NO/NC control logic.
  7. Confirm that the pressure setting matches the machine’s approved operating specification.

⚠️ Do not use the pressure switch as a mechanical stop or apply excessive torque to the housing.

Rexroth documentation for related HED 8 OH versions specifically recommends mounting the pressure switch with low vibration and protecting it from hydraulic pressure shocks.

Stage 4 — Power-On & Testing

Estimated time: 20–40 minutes

  1. Restore the hydraulic circuit gradually.
  2. Check the connection for hydraulic leakage.
  3. Increase pressure slowly while monitoring the pressure gauge.
  4. Verify that the electrical contact changes state at the intended pressure.
  5. Check both the PLC/DCS input and the associated control logic.
  6. Repeat the pressure cycle several times to confirm repeatable switching.
  7. Record the final pressure setting and replacement part number in the maintenance record.

⚠️ Do not commission the machine solely from the pressure-switch contact indication. Verify the actual hydraulic pressure independently.

 

FAQ

1. What does the Rexroth HED8OH-1050K14AS do?

It is a hydraulic pressure switch. It mechanically senses hydraulic pressure and changes an electrical contact state when the configured pressure threshold is reached.

2. Is an electronic pressure transmitter?

No. It is a mechanical pressure switch, not a continuous analog pressure transmitter. The HED 8 OH family uses piston actuation and a micro-switch for discrete switching.

3. What pressure range does the cover?

Secondary product documentation identifies the 1050 version as a 10–50 bar adjustment range. Because the exact suffix is not present in the publicly indexed Bosch Rexroth material located here, verify the range from the original nameplate or OEM documentation before replacing an installed unit.

4. What does K14 mean?

K14 identifies an electrical connection configuration used across the HED 8 pressure-switch family. Related HED 8 OH K14 models use a 4-pole connector according to DIN EN 175301-803 and provide NO/NC micro-switch functionality.

5. Can another HED 8 pressure switch replace ?

Not automatically. The replacement must match the pressure range, mechanical/hydraulic interface, electrical contact configuration, connector, seal specification, and application pressure. A 50 bar, 100 bar, 200 bar, or 350 bar HED 8 OH variant should not be treated as interchangeable without checking the complete machine specification. Rexroth documents multiple HED 8 OH configurations with different adjustment ranges.

6. Does the pressure switch require an external power supply to sense pressure?

The pressure-sensing mechanism itself is mechanical. The electrical circuit uses the pressure-operated micro-switch contacts to provide the required switching signal.

7. What should I verify before purchasing a replacement?

Provide the supplier with the , application pressure, hydraulic interface, connector configuration, existing electrical circuit voltage, and photographs of the installed unit. For an exact replacement, also verify the original Bosch Rexroth material number if available.

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