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Siemens 3RF2120-1AA45 1-Phase Semiconductor Relay

Siemens 3RF2120-1AA45 1-phase SSR, 20A, 48-600V AC, 1200V blocking voltage.

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ManufacturerSiemens

Part number3RF2120-1AA45

Type Semiconductor Relay

Phases 1

Current Rating 20 A

Load Voltage 48-600 V AC

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CAGE: 9NK75

High blocking voltage (1200V) Wide AC load voltage range (48-600V) 20A switching capacity Wide DC control voltage Compact 22.5mm size

Product description

The Siemens 3RF2120-1AA45 is a high-performance 1-phase semiconductor relay with a 20 Amp current rating. It is designed to handle AC loads from 48 to 600V and features a wide control voltage range of 4 to 30V DC. A key feature is its high blocking voltage of 1200V, offering enhanced protection against voltage transients. This 22.5 mm wide relay uses screw terminals and requires mounting on a heat sink.

This semiconductor relay is ideal for demanding applications requiring switching of high-voltage AC loads with robust transient protection. Its broad DC control voltage range and high blocking voltage make it suitable for diverse industrial environments and integration into various control systems where reliability and safety are paramount.

Stanlo Automation, a veteran-owned surplus industrial automation parts distributor, offers the Siemens 3RF2120-1AA45. We are dedicated to providing quality surplus components, ensuring our customers have access to reliable parts for their critical automation needs.

Technical specifications

Type	Semiconductor Relay
Phases	1
Current Rating	20 A
Load Voltage	48-600 V AC
Control Voltage	4-30 V DC
Blocking Voltage	1200 V
Width	22.5 mm
Terminals	Screw
Mounting	Requires cooling surface

Common applications

High voltage AC load control

Industrial power switching

Automation systems

Harsh environments

Motor and heater control

Compatible systems

Compatible with control systems providing 4-30V DC signals for switching AC loads up to 600V

Also known as

Siemens 3RF2120 600V SSR 20A high blocking voltage relay Siemens semiconductor relay 1200V

Replaces / compatible with

Suitable for applications demanding high voltage switching and enhanced protection against transients, replacing electromechanical contactors.

Technical note

Expert tip

The 1200V blocking voltage rating provides a significant safety margin for switching applications up to 600V AC; always ensure proper heat sinking for the 20A load.

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Frequently asked questions

What is the blocking voltage of the Siemens 3RF2120-1AA45 semiconductor relay?

The Siemens 3RF2120-1AA45 semiconductor relay features a high blocking voltage of 1200V. This provides superior protection against voltage spikes and transients on the AC load side, enhancing the reliability and safety of the system.