Siemens – 3RF2320‑2AA04 – 1‑Pole Solid‑State Contactor, 20 A, 48–460 VAC, 24 VDC

The Siemens 3RF2320‑2AA04 is a 1-pole, zero-cross switching solid-state contactor (SIRIUS 3RF2 family), engineered for silent, high-frequency control of resistive and inductive loads up to 20 A. Featuring a wide AC load range (48–460 V) and 24 V DC control voltage, it offers reliable performance in industrial automation, HVAC, and heating applications.

 Key Features

• Model: 3RF2320‑2AA04  

• Contact Configuration: 1 NO contact (1‑pole)  

• Load Current: 20 A (AC-51, 40 °C); UL-rated 17.6 A  

• Load Voltage: 48–460 V AC (operational range 40–506 V), 50/60 Hz  

• Control Voltage: 24 V DC (15–30 V); consumes ~15 mA (@24 V)  

• Switching Mode: Zero-cross suppression for reduced EMC and longer load life  

• Derating: Rated at 40 °C; above this, current must be derated  

• Protection & Durability:

  • Surge immunity: 6 kV (main circuit)

  • Thyr. blocking: 1.2 kV; reverse current: ≤10 mA

  • Shock: 15 g, vibration: 2 g  

• Power Loss: ~20 W at 20 A; idle ~0.4 W  

• Terminals: Spring-type for main & control circuits

  • Main: 0.5–2.5 mm²

  • Control: 0.5–1.5 mm²  

• Mounting: Screw & snap onto 35 mm DIN rail; width 22.5 mm; depth 123 mm; height 95 mm  

• Certifications: IEC 60947‑4‑3, UL 508; RoHS‑compliant  

• Protection Rating: IP20  

• Weight: 0.185 kg