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Current Monitoring Relay DG 35300

Monitoring of DC and AC current signals

The configurable Current Monitoring Relay DG 35300 is used for limit monitoring and processing of DC and AC current signals and mV signals for current measuring with shunt resistors. A SPST relay or optionally an isolated, passive transistor switch (Open-Collector) is available at the output.

  • Input for current measurement and mV shunt voltage
    using internal or external shunt resistor
  • Easy configurable via DIP switches or via USB
    limit point, hysteresis and mode of operation can be directly set, limit point adjust
  • Switchable timer and special functions
    Switch-on delay, switch-off delay and wiper function, Memory and window functions
  • 3-Port-Separation
    protection against switching errors due to parasitic voltages or ground loops
  • Extremely slim design
    6.2 mm slim housing for a simple and space saving DIN rail mounting
  • Optional In-Rail-Bus mounting rail connector
    allows for fast and economical installation
  • Protective Separation acc. to EN 61140
    Protects service personnel and downstream devices against impermissibly high voltage
  • 5 Years Warranty
    Defects occurring within 5 years from delivery date shall be remedied free of charge at our plant (carriage and insurance paid by sender)

The Current Moni­toring Relay monitors AC/DC current signals and mV signals for MIN and MAX Alarm and trans­mits the limit value message to the switching output.

The configu­ration is carried out via DIP switches or via the front pro­gramming inter­face (requires DZU 1201, see accessories). The monito­ring relay has an adjus­table switch-on delay, switch-off delay and a wiper function. Further settings such as latch function and window function are also possible.

Power can be supplied via the connec­tion terminals or via the optio­nal In-Rail-Connec­tor (see accessories). The switching status and the device status are indicated by LEDs on the front panel. If the device is operated via the In-Rail Connector, a group message is available.

Product line

Product line DG 35300
Device Type Order No.
Current Monitoring Relay, Relay, configurable per DIP switch DG 35300 S
Current Monitoring Relay, Relay, configurable per DIP switch,
In-Rail-Bus for power supply and group message
DG 35300 B
Current Monitoring Relay, Transistor, configurable per DIP switch DG 35380 S
Current Monitoring Relay, Transistor, configurable per DIP switch,
In-Rail-Bus for power supply and group message
DG 35380 B

Technical Data


  Current Input mV Input
Input signal 1)
Monitoring range
0 to 5 A AC/DC
0 to 5500 mA
0 to 150 mV
0 to 165 mV
Input resistance 0.01 Ω 100 kΩ
Over load < 10 A (< 30 A for 1 s) < 30 V


DG 35300
Relay (SPST)
250 V AC / 30 V DC / 2 A
Recommended minimum load 300 mW / 5 V / 5 mA
DG 35380
Transistor (Open-Collector)
36 V DC / 50 mA, Residual voltage < 1.5 V ated
not current limited
Switching functions Make contact, break contact
Normal, Latch
Time function On delay:
Off, 1 s, 2 s, 3 s, 5 s, 10 s, 20 s, 30 s
Resonse time ≤ 20 ms
Switch state indicator Yellow LED on front
Group message Signal at In-Rail-Connector E (supply circuit) at device failure and alarm

General Data

Switching error DC: < 0.2 % full scale
AC: < 0.5 % full scale
Temperature coefficient < 100 ppm/K
Test voltage 3 kV AC, 50 Hz, 1 Min., Input against output against
power supply/In-Rail-Connector
Working voltage 1)
(Basic Insulation)
600 V AC/DC for overvoltage category II and pollution
degree 2 acc. to EN 61010-1
Protection against electrical shock 1) Protective Separation by reinforced insulation acc. to
EN 61010-1 up to 300 V AC/DC for overvoltage
category II and contamination class 2 between input
and output and power supply.
Ambient temperature Operation
Transport and storage
–25 °C to +70 °C  (-13 to +158 °F)
–40 °C to +85 °C  (-40 to +185 °F)
Power supply 24 V DC,     16.8 V to 31.2 V DC, max. 1.0 W
EMC 2) EN 61326-1
Construction 6.2 mm (0.244") housing, protection class IP 20, mounting on 35 mm DIN rail acc. to EN 60715
Connection Captive plus-minus clamp screws
Wire cross-section 0.5 to 2.5 mm2 / AWG 20-14
Stripped length 8 mm / 0.3 in
Screw terminal torque 0.6 Nm / 5 lbf in
Weight Approx. 70 g
  1. As far as relevant the standards and rules mentioned above are considered by development and production of our devices. In addition relevant assembly rules are to be considered by installation of our devices in other equipment’s. For applications with high working voltages, take measures to prevent accidental contact and make sure that there is sufficient distance or insulation between adjacent situated devices.
  2. Minor deviations possible during interference

Block diagram


Terminal assignments

  • 1 + Reset
  • 2 + mV input
  • 3 − GND
  • 4 + Current input
  • 5 Relay
  • 6 Relay
  • 5 + Transistor output
  • 6 − Transistor output
  • 7 + Power supply 24 V DC
    (connected to In-Rail-Bus)
  • 8 − Power supply 24 V DC
    (connected to In-Rail-Bus)

Optional power connection via In-Rail-Bus (see accessories)

Subject to change!

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