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Siemens SIRIUS 3RF31 Solid-State Relay 25 A (1-Pole)

Siemens SIRIUS 3RF31 Solid-State Relay 25 A (1-Pole)

  • Brand: Siemens
  • Product Code: 3RF31 25 A

Prices are prepared per project according to capacity, energy type and delivery terms.

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Siemens SIRIUS 3RF31 25 A solid-state relay: 1-pole, 22.5 mm width, without heat sink (must be mounted on a suitable heat sink). Contactless, silent and wear-free switching makes it ideal for frequently switched loads such as heating elements.

Technical data

Series3RF31
Product typeSolid-State Relay, 1-pole, 22.5 mm width, without heat sink (must be mounted on a suitable heat sink)
Maximum current25 A (with suitable cooling, AC-1)
Line voltage24–230 V AC, 48–460 V AC, 48–600 V AC
Control supply voltage110–230 V AC, 24 V DC, 4–30 V DC
ConnectionScrew, Spring-loaded, Ring cable lug
Frequency50–60 Hz
Typical useResistive heaters, furnace and extruder heating zones, loads with frequent switching

Article numbers

Line voltageSwitching typeControl voltageConnectionArticle No.
24–230 V ACZero-point switching24 V DCScrew3RF3125-1AA02
24–230 V ACZero-point switching4–30 V DCScrew3RF3125-1AA42
24–230 V ACZero-point switching110–230 V ACScrew3RF3125-1AA22
48–460 V ACZero-point switching24 V DCScrew3RF3125-1AA04
48–460 V ACZero-point switching110–230 V ACScrew3RF3125-1AA24
48–460 V ACInstantaneous switching24 V DCScrew3RF3125-1BA04
48–600 V ACZero-point switching4–30 V DCScrew3RF3125-1AA45
24–230 V ACZero-point switching24 V DCSpring-loaded3RF3125-2AA02
24–230 V ACZero-point switching4–30 V DCSpring-loaded3RF3125-2AA42
24–230 V ACZero-point switching110–230 V ACSpring-loaded3RF3125-2AA22
48–460 V ACZero-point switching24 V DCSpring-loaded3RF3125-2AA04
48–460 V ACZero-point switching110–230 V ACSpring-loaded3RF3125-2AA24
48–600 V ACZero-point switching4–30 V DCSpring-loaded3RF3125-2AA45
24–230 V ACZero-point switching24 V DCRing cable lug3RF3125-3AA02

Zero-point switching versions are for resistive loads (heaters), instantaneous switching versions for inductive loads. In systems with high voltage peaks or at 575 V and above, versions with 1600 V blocking voltage are recommended. Solid-state relays must be mounted on an adequately dimensioned heat sink; a sheet-steel mounting plate is inadequate for heat dissipation. Other control supply voltages on request.

Technical data and article numbers are based on Siemens catalog IC 10 · 2026 (chapter 6, solid-state switching devices) and are for information only. Image is representative.

For price, stock and lead time, use the Request a Quote button or call +90 533 945 27 94. Sending the article number is enough.

Tags: 3RF31 25 A, siemens ssr, solid-state relay, 3RF31, heater control, 3RF3125-1AA02, 3RF3125-1AA42, 3RF3125-1AA22, 3RF3125-1AA04, 3RF3125-1AA24, 3RF3125-1BA04, 3RF3125-1AA45, 3RF3125-2AA02, 3RF3125-2AA42, 3RF3125-2AA22, 3RF3125-2AA04, 3RF3125-2AA24, 3RF3125-2AA45, 3RF3125-3AA02