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Siemens 3RF2120-1AA04 1-Phase Semiconductor Relay

Siemens 3RF2120-1AA04 1-phase semiconductor relay, 20A, 48-460V AC load.

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ManufacturerSiemens

Part number3RF2120-1AA04

Type Semiconductor Relay

Phases 1

Current Rating 20 A

Load Voltage 48-460 V AC

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Veteran-owned

CAGE: 9NK75

Wide AC load voltage range 20A switching capacity 24V DC control input Compact 22.5mm form factor Solid-state reliability

Product description

The Siemens 3RF2120-1AA04 is a 1-phase semiconductor relay designed for robust operation with a 20 Amp current rating. It features a wider operational voltage range for the load side, rated from 48 to 460V AC, and accepts a 24V DC control voltage. This relay has a 22.5 mm width and utilizes screw terminals, requiring mounting on a suitable heat sink for effective thermal dissipation.

This semiconductor relay is well-suited for applications requiring switching of single-phase loads within a broad AC voltage spectrum, controlled by a stable 24V DC signal. It's commonly used in industrial automation for controlling heaters, motors, and lighting where precise, solid-state switching is needed, and its compact size is advantageous.

Stanlo Automation, a veteran-owned surplus industrial automation parts distributor, offers the Siemens 3RF2120-1AA04. We are committed to providing reliable automation components, ensuring our customers have access to quality parts to maintain and optimize their systems.

Technical specifications

Type	Semiconductor Relay
Phases	1
Current Rating	20 A
Load Voltage	48-460 V AC
Control Voltage	24 V DC
Width	22.5 mm
Terminals	Screw
Mounting	Requires cooling surface

Common applications

Industrial AC load control

HVAC systems

Motor control

Heating applications

Automation panels

Compatible systems

Works with control systems providing 24V DC signals for switching AC loads up to 460V

Also known as

Siemens 3RF2120 480V relay 20A 48-460V SSR Siemens semiconductor relay 24V DC control

Replaces / compatible with

Can replace electromechanical relays in applications with higher AC voltage loads where solid-state switching benefits are desired.

Technical note

Expert tip

Ensure the control signal is a stable 24V DC source; voltage fluctuations could affect switching performance. Proper heat sinking is mandatory for continuous operation.

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Frequently asked questions

What is the maximum AC load voltage for the Siemens 3RF2120-1AA04 semiconductor relay?

The Siemens 3RF2120-1AA04 semiconductor relay is designed to switch AC loads up to 460 Volts. It operates reliably within a load voltage range of 48 to 460V AC, controlled by a 24V DC signal.