Rotational Direction Monitor SAFEONE DN3PR1

The rotational direction monitor DN3PR1 does not require a measuring system nor external sensors and are therefore unique on the market in this way.

Thus, the innovative DN3PR1 is a good choice for retrofits as well as the most modern machines up to Performance Level e.

The simple installation and user-friendly parameterisation make safety a breeze. Just quickly configure the most essential parameters, since we have already done everything else for you.

No Sensor necessary
No parameterisation necessary
Fits every switch cabinet


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DN3PR1 Drehrichtungswächter mit Zertifikat

Safe direction monitoring easier than ever.

For safe monitoring of three-phase asynchronous motors up to 690V AC with Performance Level e, it is not even necessary to parameterise the device. The module measures the frequency of the 3 motor phases as long as the drive is running. The output provides a signal when the drive moves in the preset, desired direction. However, the contact output opens immediately if the drive moves in a different, wrong direction, which breaks the circuit and stops the drive.

8-1 9-3   10-3 11-3 12-213-114-1


General Data

Operational Voltage UB 24 V DC (-15/+10%)
Power consumption at 24V 80 mA
Power input at A1/A2 1,9 W
Protection (Case and Terminals) IP20
Protection (Installation Site) min. IP 54
Clearance and creepage distances between circuits according to DIN EN 50178
Rated insulation voltage 400V AC to Ground 690V AC Phase to Phase
Rated impulse voltage / insulation Basic insulation 6kV: between all current paths and enclosure Safe separation, reinforced insulation 8kV: between U, V, W and A1, A2, O1, O2, Q between U, V, W and 13/14, 23/24
Degree of contamination 2
Surge voltage category III
Encasing material Polyamide PA unreinforced
Measurement 422,5 x 114 x 111 mm (0.886 x 4.488 x 4.370 in)


Input Data

Digital Inputs 1 safety-related input Q
Input voltage 24V DC (-15/+10%)
Inrush current < 5,0 mA
Power consumption typ. 4 mA (at UB)
Measurement Inputs U, V, W
Input voltage 90V AC to 480V AC (Phase vs. Phase)
Power consumption 0,24mA at 480V AC
Cut-off frequency 1200Hz
Rotational direction detection >5Hz to 100Hz, two signalling periods
Min. PWM 1kHz


Output Data

Signal outputs O1, O2 not safety-related
Voltage UB – 1V
Max. switching current ≤ 100mA, short-circuit and overload proof
Contact outputs 13/14, 23/24
Contact Material AgSnO2
Switching Voltage 24V DC / 230V AC
Min. Switching Voltage 3 mA/ 24V DC
Max. Switching Voltage 6A / 24V DC / 230V AC
Short-circuit resistance 1000A SCPD 6A gL/gG
Mechanical service life 10^7 Schaltspiele
Response time 2 x (period duration (reciprocal of frequency) + max. 1ms evaluation time) + max. 10ms relay response time
Process safety time 1,8 s
Output fuse 6 A gL/gG
B10d Values according to DIN EN 61810-2- 1, 01.2012 2AC15: 5A/230V AC, >2x105 switching cycles AC1: 6A/230V AC, >2x105 switching cycles DC13: 4A/24V DC, >3x105 switching cycles DC1: 6A/ 24V DC, >7x106 switching cycles


Environmental Data

Operating Temperature -20°C to +55°C
Storage Temperature -40 °C to +85 °C
Max. Height for operating device < 2000m above sea level
Vibration 10–150Hz, 1g
Shock resistance 15g


Block circuit diagram


Sample Application

Measurement Inputs The Measurement inputs U, V, W of the DN3PR1 are directly connected to the three phases of the motor M.
Safe Switch Off When the DN3PR1 detects a change of direction, the enabling current paths
current paths 13/14, 23/24 open and switch off the motor in a safety-oriented manner,
resetting the
safety function    
Resetting the safety function The S1 acknowledgement button is used to reset the safety function after the motor has turned in the preferred direction again the motor rotates in the preferred direction again.
Monitoring of external
The external, positively-driven contactors K1, K2 are integrated into the start circuit of the
of the safety switchgear.

Bildschirmfoto 2022-10-18 um 09.43.16


Safety-relevant Parameters according to ISO 13849-1

Utilisation Category

PFHd (h) MTTFd (a) DCavg
6A DC1 2 Operations/h 4,91 x 10^-9 471 99%
4A DC13 2 Operations/h 1,19 x 10^-8 203 99%
6A AC1 2 Operations/h 1,16 x 10^-8 157 99%
5A AC15 2 Operations/h 1,87 x 10^-8 157 99%



  • Three-phase motors with frequency inverter
  • Servo motors
  • Motors with star-delta connection


  • Woodworking
  • Metalworks
  • Construction
  • Spindles
  • Centrifuges
  • and many more...

Your advantages summarised.



No external measurement systems equals less components, lower costs as well as faster Certification and Validation.

Be independent

Can be used on all three-phase and single-phase motors up to Performance Level e, regardless of supplier and system.

Fits into every cabinet

With an overall width of only 22,5 mm/0.9 in

Simple Configuration

Model-dependent via USB interface on the PC or directly via SET key. In the case of the direction of rotation monitor, no parameterisation is necessary at all.

Plug & Play

Easy to put into action without a great deal of prior knowledge. Integration into the circuit diagram is also very simple.


DN3PR1 Front