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Pressure Switch PSP-400

Measuring device for monitoring the hydraulic operating mechanisms of high-voltage circuit breakers

The pressure switch PSP-400 continuously measures the hydraulic pressure in the relevant operating mechanism. The measurements are performed by a precise and sturdy polysilicon pressure sensor. Relays indicate when the measured values are below or above the variable limits; the measured data can be read out by way of an RJ-45 interface. Data export facilitates reliable control of the hydraulic pump and the activation of lockouts and alarm signals.


Key Features

  • Pressure range 0 to 400 bar
  • 7 or 10 limit values, set via PC
  • Reliable signaling in case of limit violations
  • RJ-45 interface
  • Self-diagnostic sensor
  • Rugged construction, long service life



The PSP-400 consists of the following principal components:

  • Strong aluminum alloy enclosure
  • Polysilicon pressure sensor with self-diagnostic capability
  • Evaluation unit with microprocessor
  • Relays with floating contacts for signaling limit violations
  • LED status display
  • Plug-in connectors (Phoenix Combicon)
  • RJ-45 data output
  • Aluminum alloy pressure connection

Operating principle

Before the device is put into service, the desired hydraulic limits are set with a PC or notebook computer. During operation the polysilicon sensor of the PSP-400 continuously measures the hydraulic pressure in the connected system. The current measured values are output by way of the RJ-45 interface. Limit violations activate the floating NC/NO contacts (relays) and trigger the relevant signal. In addition, LEDs on the unit display the current status (green LED: normal operation, red LED: limit violation). The output measured values and signals facilitate precise control of the hydraulic pump and the reliable activation of lockouts and alarms in case of a malfunction.


High operating reliability is ensured by the sensor’s self-diagnostic capability and an additional relay for error messages. The set limit values are retained even in the event of a power failure. The electronic pressure switch is designed for a service life of > 30 years. It is impossible for an undefined condition to arise at the relay outputs in case of a malfunction of the sensor, evaluation unit (microprocessor, memory, A/D converter, DC-DC converter etc.), or output device (relays). Apart from monitoring the hydraulic operating mechanisms of high-voltage circuit breakers, the PSP-400 is also suitable for other hydraulic pressure applications.


The information on this website represents the state of knowledge at the time of writing. Technical specifications are subject to modifications. Comde-Derenda GmbH accepts no liability whatsoever for the content provided or for damages resulting from the use of its products.

Technical Data

Connector with screw base Phoenix Combicon, IEC 60947, max. 2.5 mm²
Interface RJ-45
Optional data converters RJ-45 / RS-232 and RJ-45 / USB-B
Protection class IP 20 IAW IEC 60529
Supply voltage 60 … 250 VDC; 120 … 240 VAC
Pressure range 0 … 400 bar / 0 … 5800 psi
Overload pressure 600 bar / 8700 psi
Linearity < 0.2 % FS (typ.)
Hysteresis < 0.05 % FS (typ.)
TK Zero < 0.02 % FS (typ.)
TK Sensitivity < 0.01 % FS (typ.)
Long-term stability < 0.1 % FS (typ.)
Electrostatic discharge IEC 61000-4-2 Class 2
High frequency irradiation IEC 61000-4-3 Class 3
Burst IEC 61000-4-4 Class 4
Surge voltage IEC 60255-5: 5 kV (1.2/50 µs)
Interference IEC 61000-4-6 Class 3
Isolation test IEC 61180-1: 2 kV 50 Hz
Oscillation IEC 60100-4-12: 100 kHz and 1 MHz
Sinusoidal oscillation IEC 60068-2-6: 10 … 150 Hz, 2 g
Vibration IEC 60068-2-27: ± 10 g, ± 1 mm
Seismic endurance IEC 60068-2-3: 1.6 … 35 Hz 4 mm / 1 g
Electrical switch rating,
Resistive load (inductive load)
DC 250 V, 0.28 (0.4) A
DC 220 V, 0.3 (0.45) A
DC 125 V, 0.5 (0.7) A
DC 110 V, 0.56 (0.8) A
DC 60 V, 4.2 (6) A
DC 48 V, 5.6 (8) A
Operating temperature –40 … +70 °C / –40 … +158 °C
Storage temperature –50 … +70 °C / –58 … +158 °C
Weight PSP-400-07 1518 g
Weight PSP-400-10 1580 g

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