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Current Measuring Contactor DG 3300

Monitoring of 1/5 A AC/DC Current

The Current Measuring Contactor DG 3300 is used to monitor limit values of 0 to 1/5 A AC/DC current circuits.

  • Easy selection of operating mode
    MIN / MAX alarm and N.O. / N.C. contact can be easily set by using DIP switch
  • Relay with high power handling
    or wearless optocoupler switching output
  • True 4-port separation
    Protection against erroneous measurements due to parasitic voltages or ground loops
  • Switch state indicated by LED
    Easy to adjust the set point and hysteresis
  • Protective Separation acc. to EN 50178
    Protects service personnel and downstream devices against impermissibly high voltage
  • High reliability and long-term stability
    New APT technology, no maintenance costs
  • Unlimited use with 24 V AC/DC power supply
    Universally applicable for all measurement and industrial applications
  • 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)

High reliability and Protective Separation are essential characteristics that contribute to fault-free equipment operation.

Two switch channels can be separately configured. The switch point and the switch hysteresis can each be adjusted by means of their own 12-turn potentiometer located on the unit’s front panel. The switch state is indicated by a yellow LED.

The direction of effect and the mode of operation can be switched by means of DIP switch settings. Both switch outputs can be set up as either MIN or MAX alarms. The relay contacts switch high power loads either as N.O. or N.C. contacts.

Protective Separation and the 24 V AC/DC power supply make the DG 3300 universally applicable for all measurement and industrial applications, as well as for building automation.

Product line

Product line DG 3300
Devices Order No.
Current Measuring Contactor with relay contacts DG 3300
Current Measuring Contactor with transistor switches DG 3380

Data sheet archive:

The products are no longer available!

Technical Data


Input signal DC: 0 to 1 A, ± 1 A, 0 to 5 A, ± 5 A
AC: 0 to 1 A, 0 to 5 A
sinusoidal alternating currents, f = 10 to 500 Hz
Input resistance < 10 mOhm
Overload 2 x IN continuous, surge current: 100 A for 1 s
Set point range 0 to 100 % of input range with 12-turn potentiometer , MIN/MAX-Alarm switchable
Hystersis 0 to 60 % of final value with 12-turn potentiometer


DG 3300 (Relay):
    Contact type
    Switching cap. AC max.
    Switching cap. DC max.

2 SPDT relays, mode of operation switchable
250 V / 6 A     1500 VA
250 V / 0.2 A   115 V / 0.3 A   30 V / 6 A
Recommended minimum load 300 mW / 5 V / 5 mA
DG 3380 (Optocoupler):
    Contact type
    Switching capability

2 optocoupler transistor switches, mode of operation switchable
30 V DC, max. 50 mA
Switch state indicator Yellow LED
Response time DC Input: approx. 20 ms    AC Input: approx. 500 ms

General Data

Set point error < 0,2 % full scale
Temperature coefficient 1) < 150 ppm/K
Test voltage 4 kV AC, 50 Hz, 1 min., input against power supply against both switching outputs
2.5 kV AC, 50 Hz, 1 min., switching output I against switching output II
Working voltage 2)
(Basic Insulation)
600 V AC/DC for overvoltage category III and pollution degree 2 acc. to
EN 50178 between input, power supply and relay outputs.
Up to 300 V AC/DC between both relay outputs.
Protection against electrical shock 2) Protective separation according to EN 50178 by reinforced insulation up to
300 V AC/DC for overvoltage category II and pollution degree 2 between
input, power supply and relay outputs.
Power supply 24 V AC/DC, ± 15 % AC: 48 to 62 Hz, approx. 2 VA
DC: approx. 1 W
Ambient temperature Operation
Transport and storage
–20 °C to +60 °C   (-4 to +140 °F)
–35 °C to +85 °C   (-31 to +185 °F)
EMC 3) EN 61326 -1
Construction 22.5 mm (0.89") housing, protection class: IP 20
mounting on 35 mm DIN rail acc. to EN 60715
Weight Approx. 100 g

Other measuring ranges on request.

  1. Average TC related to full scale value in specified operating temperature range, reference temperature 23 °C
  2. For applications with high working voltages, ensure there is sufficient spacing or isolation from neighboring devices and protection against electric shocks.
  3. Minor deviations possible during interference

Block diagram


Terminal assignments

  • 5 + Input
  • 8 − Input
  • 1, 2 Power supply 24 V AC/DC
  • 3, 4 Power supply 24 V AC/DC
  • 11 N/C
  • 9, 10 Output I
  • 12 N/O
  • 15 N/C
  • 13, 14 Output II
  • 16 N/O

Subject to change!

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