E. Dold & Söhne GmbH & Co. KG

Tel.: +49 7723 654-0
E-Mail: dold-relays@dold.com

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LH 5946

Standstill monitor

LH 5946


Time range

Auxiliary voltage

Response value

Terminal type

Approvals and Markings


  • 0059266
  • LH5946.48/61 20-400mV UH DC24V
The safe sensorless LH 5946 standstill monitor is suitable for detects the standstill of 3-phase... more

Product description

The safe sensorless LH 5946 standstill monitor is suitable for detects the standstill of 3-phase and 1-phase electric motors independent of the direction of rotation. This means sensors such as encoders or proximity switches are not required. The standstill monitor measures the induced voltage of the coasting motor. If the induced voltage approaches 0, this means motor standstill for the device and the output relay is activated.

Technical specifications

Width: 45 mm
Classification: Sensorless
Cat. / PL acc. to EN ISO 13849-1: 4/e
SIL CL acc. to IEC/EN 62061: 3
Nominal voltage: AC, DC
Thermal current Ith max.: 5 A
1- / 2-channel: 2
Connection: Screw terminals, Pluggable screw terminals, Pluggable cage clamp terminals
Indicator contacts: 2 Semiconductor monitoring outputs, 1 NO contact
Measuring motor voltage max.: 690 V
Approvals: UL
Forcibly guided output contacts max.: 1 NC contact, 3 NO contacts
Type: LH 5946


  • Without sensor and safe
  • Fast reaction time
  • Easy to retrofit
  • Combined with Interlock SAFEMASTER STS


  • According to
    - Performance Level (PL) e and category 4 to EN ISO 13849-1
    - SIL-Claimed Level (SIL CL) 3 to IEC/EN 62061
    - Safety Integrity Level (SIL) 3 to IEC/EN 61508, IEC/EN 61511
    and EN 61800-5-2
  • Safe standstill detection on 3- and single-phase motors
  • No external sensors necessary
  • Independent of direction
  • Broken wire detection
  • Forcibly guided safety contacts: 3 NO contacts, 1 NC contact for AC 250 V
  • 2 semiconductor monitoring outputs
  • 1 monitoring output (NO contact)
  • Adjustable voltage setting
  • Adjustable standstill time delay
  • LED indicators for standstill, event of line breakage and operation voltage
  • Suitable for operation with inverters
  • Width 45 mm