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Siemens 3RF2120-1AA02 1-Phase Semiconductor Relay

Siemens 3RF2120-1AA02 1-phase semiconductor relay, 20A, compact 22.5mm width.

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ManufacturerSiemens

Part number3RF2120-1AA02

Type Semiconductor Relay

Phases 1

Current Rating 20 A

Control Voltage 24-230 V AC / 24 V DC

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Compact 22.5mm width 1-phase solid-state switching 20A current handling Versatile AC/DC control voltage Screw terminals

Product description

The Siemens 3RF2120-1AA02 is a compact 1-phase semiconductor relay featuring a 20 Amp switching capacity. It is designed with a narrow width of 22.5 mm and accommodates a control voltage range of 24 to 230V AC or a specific 24V DC. This relay uses screw terminals for secure connections and is intended for mounting on appropriate heat sinks to ensure effective thermal management.

This semiconductor relay is ideal for space-constrained applications requiring reliable single-phase load switching. It can be used to control resistive loads like heaters, or inductive loads with appropriate protective measures. The versatility in control voltage (AC or DC) allows for easy integration into various industrial control systems where space is at a premium.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Siemens 3RF2120-1AA02. We provide access to quality components, ensuring your automation projects are equipped with reliable parts sourced from a trusted supplier.

Technical specifications

Type	Semiconductor Relay
Phases	1
Current Rating	20 A
Control Voltage	24-230 V AC / 24 V DC
Width	22.5 mm
Terminals	Screw
Mounting	Requires cooling surface

Common applications

Compact control panels

Small motor control

Heating element control

Lighting control

General automation tasks

Compatible systems

Connects to control outputs from PLCs and other automation controllers with 24-230V AC or 24V DC signaling

Also known as

Siemens 3RF2120 relay 20A solid state relay 22.5mm Siemens compact SSR

Replaces / compatible with

A suitable replacement for electromechanical relays in applications where space is limited and solid-state reliability is beneficial.

Technical note

Expert tip

Ensure sufficient airflow and an appropriately sized heat sink are used, especially for continuous operation at higher currents within the 20A rating.

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Frequently asked questions

What are the dimensions of the Siemens 3RF2120-1AA02 semiconductor relay?

The Siemens 3RF2120-1AA02 semiconductor relay is a compact unit with a width of 22.5 mm, making it ideal for installations where space is a constraint. It requires mounting on a heat sink for proper thermal management.