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Siemens 3RH1921-2EA20 Lateral Auxiliary Switch - 2 NO

Siemens 3RH1921-2EA20 Lateral Auxiliary Switch with 2 NO contacts.

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ManufacturerSiemens

Part number3RH1921-2EA20

Contact Configuration 2 NO

Terminal Type Spring-Type Terminal

Mounting Lateral

Series SIRIUS 3RH19

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Veteran-owned

CAGE: 9NK75

2 normally open (NO) contacts Spring-type terminals for fast connection Lateral mounting for space saving Compatible with 3RT1 contactors SIRIUS quality IP20 rated

Product description

The Siemens 3RH1921-2EA20 is a lateral auxiliary switch designed for Siemens 3RT1 contactors. It features two normally open (NO) instantaneous contacts and utilizes spring-type terminals for efficient and secure wiring. This side-mounted switch allows for expanded control and signaling capabilities without occupying front mounting space.

This auxiliary switch is valuable for applications requiring two independent NO feedback signals for status indication or interlocking. It is widely used in industrial automation, control panel construction, and machinery applications where enhanced control logic is needed.

Stanlo Automation, a veteran-owned surplus distributor, offers the Siemens 3RH1921-2EA20. We provide reliable automation components and exceptional service to meet your industrial needs.

Technical specifications

Contact Configuration	2 NO
Terminal Type	Spring-Type Terminal
Mounting	Lateral
Series	SIRIUS 3RH19
Compatibility	Siemens 3RT1 Contactors
IP Rating	IP20 (Front)
Insulation Voltage	500V AC
Surge Voltage	6 kV

Common applications

Motor Control

Control Panels

Industrial Automation

Signaling

Interlocking Circuits

Machinery

Compatible systems

Siemens 3RT10, 3RT12, 3RT145, 3RT146, 3RT147 Contactors

Also known as

Siemens SIRIUS 3RH1921-2EA20 3RH1921-2EA20 Siemens Side Mount Double NO Contact

Replaces / compatible with

This lateral auxiliary switch expands the functionality of Siemens 3RT1 series contactors by adding two NO contacts for additional control and signaling circuits.

Technical note

Expert tip

The spring-type terminals offer a secure connection that resists vibration. When mounting laterally, ensure sufficient clearance for wiring and potential maintenance access.

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Frequently asked questions

Can the Siemens 3RH1921-2EA20 be used with solid-state control systems?

While the 3RH1921-2EA20 is a mechanical auxiliary switch, its contact reliability is high, with 1 faulty switching per 100 million operations at 17V/1mA. For solid-state compatibility, especially in environments with low switching loads, the encapsulated versions like the 3RH1921-2DE11 are often preferred.