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Siemens 3RH2911-1HA21 Front Mount Auxiliary Switch - 2 NO + 1 NC

Siemens 3RH2911-1HA21 Front Mount Auxiliary Switch - 2 NO, 1 NC

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ManufacturerSiemens

Part number3RH2911-1HA21

Contacts 2 NO, 1 NC

Mounting Front

Terminals Screw

Compatibility 3RT2 (S00-S2), 3RH2

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2 Normally Open (NO) + 1 Normally Closed (NC) Contacts Front Mounting Screw Terminals Snap-on Installation Compatible with 3RT2 and 3RH2

Product description

The Siemens 3RH2911-1HA21 is a front-mounting auxiliary switch designed to add two Normally Open (NO) and one Normally Closed (NC) contact to Siemens SIRIUS 3RT2 contactors and 3RH2 contactor relays. It offers screw terminals for secure connections and a snap-on design for easy front installation on compatible devices.

This auxiliary switch is ideal for applications requiring a combination of make and break contacts for control, signaling, and interlocking functions. The two NO contacts close when the main contactor or relay is energized, while the single NC contact opens. It is compatible with Siemens 3RT2 contactors in sizes S00, S0, and S2, as well as 3RH2 contactor relays.

Stanlo Automation, a veteran-owned surplus industrial parts distributor, offers the Siemens 3RH2911-1HA21 auxiliary switch. We are committed to providing reliable, high-quality components for your automation needs, ensuring cost-effectiveness and operational efficiency for your business.

Technical specifications

Contacts	2 NO, 1 NC
Mounting	Front
Terminals	Screw
Compatibility	3RT2 (S00-S2), 3RH2
Current Rating	10A AC-12, 6A AC-15

Common applications

Motor Control

Control Circuits

Signaling

Interlocking

Automation Systems

Status Indication

Compatible systems

Siemens 3RT2 (S00-S2) Siemens 3RH2

Also known as

Siemens 3RH2911-1HA21 Aux Contact Siemens Contactor Relay Auxiliary Block

Replaces / compatible with

This auxiliary switch is designed for use with Siemens SIRIUS 3RT2 contactors and 3RH2 contactor relays.

Technical note

Expert tip

The snap-on mounting feature of the 3RH2911-1HA21 allows for quick and tool-free integration onto the front of Siemens SIRIUS 3RT2 contactors and 3RH2 contactor relays.

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Frequently asked questions

What is the functionality of the Siemens 3RH2911-1HA21 auxiliary switch?

The Siemens 3RH2911-1HA21 provides two Normally Open (NO) contacts that close when the associated contactor or relay is energized, and one Normally Closed (NC) contact that opens. This configuration is versatile for control and signaling purposes.