• 1 change-over contact for max. 20 A
  • 2 change-over contacts for max. 10 A
  • Drive by one or two coils
  • Defined switching position in the event of power outage
  • With manual override and position display
  • Ambient temperatures -25 to +70 °C
  • Customer-specific contacts
Have questions or need an offer?

We will be pleased to help you.

  • Hengstler GmbH
    Uhlandstr. 49
    78554 Aldingen
  • Tel. +49 / 7424 - 89 -468
  • Support request


Function / ApplicationBistable relay
Product lineKACO
Relay familyRP
Ambient temperature [°C]-25 ... +70 °C
Soldering heat resistance [°C]260 °C
Max. soldering time [s]5 s
Pins pre-soldered with Sn 100
StandardsIEC 61810-1
Meets the requirementsRoHS


Number of NO contacts0 ... 1
Number of NC contacts0 ... 1
Number of CO contacts0 ... 2
Dimensions L x W x H [mm]37,7 x 13,0 x 28,0 mm
Housingdustproof (RT II)
Shock resistance [g]100 g
Puls duration (half sinus)11 ms
Vibration resistance [g]20 g
Frequency range [Hz]10 - 55 Hz
Operating time [ms] 10 ms
Releasing time [ms] 10 ms
Mechanical service life (without load)1,000,000 switching cycles
Connection typeSolder pins for pcb
Weight [g]20 g


Drive system DC bistable
Nominal coil voltage [V]5 ... 48 V
Coil resistance [Ohm]16 ... 3,500 Ohm
Contact material
  • AgCdO
  • AgNi + 0,2 µm Au
Max. switching current [A]
  • 1 CO Contact: 20 A
  • 2 CO Contacts: 10 A
Max. switching voltage [V]230/240 V
Max. switching capacity [VA]2650 VA
Electrical service life (with nominal load)
  • 10 A version: 120,000 cycles
  • 20 A version: 3,0000 cycles
InsulationReinforced insualtion
Only a short switching pulse is required to make the K-RP bistable relay from HENGSTLER reliably switch over. This means that, even in the event of a power outage, the relay is always in a clearly defined, safe switching position. The special H-armature construction means that extremely high shock and vibration resistance can be achieved. A manual switch is available in a number of colours to suit customer preference to enable the switching state to be manually operated. K-RP bistable relays conform with standard IEC EN 61810-1.