Switches for frequency

Limit value switch for terminal W of a 24 V three-phase generator


Limit value switch RFW5

  • Limit value switch for input automotive alternator
  • Simple application; for rough environments
  • Limit value freely adjustable by drum scale
  • Open-circuit or closed-circuit devices available
  • Compact and robust construction
  • Operating status indication by integrated LED


Limit value switches of type RFW5 monitor electrical measured variables. The integrated relay switches when the actual value present reaches the set target value. Open-circuit devices can also be equipped with a self-latching feature as an option. Its compact and robust design, as well as the relevant shipbuilding approvals, make this product ideal for marine applications.

Technical data

Supply voltage US UsW-Terminal of a 24 V automotive alternator
Input signalW-Terminal of a 24 V automotive alternator
Output contactPotential-free normally open contact or normally closed contact, closed circuit or open circuit
Maximum switching capacity30 W (1 A at 30 VDC; 0.5 A at 60 VDC); 40 W (0.2 A at 220 VAC)
Operating temperature-20 °C ... +70 °C
ConnectionDIN 46244 fl at connector, gold-plated A6.3 x 0.8
MountingSnap-fit on G-channel TS32 or top-hat channel TS35

Ordering information

Type code structure
RFW501-A2Example: RFW501-A2
Input range
 Output signal
Type code RFW5 …
Input range 000 … 100 Hz 
010 … 1,000 Hz 
020 … 10,000 Hz 
Output contact R1NC contact in normally closed 
R2NO contact in normally closed 
A1NC contact in normally open 
A2NO contact in normally open 
S1NC contact in normally open with self-latching feature 
S2NO contact in normally open with self-latching feature 
RFW5__-__Example: RFW501-A2