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Siemens 3RH2911-1HA31 Front Mount Auxiliary Switch - 3 NO + 1 NC

Siemens 3RH2911-1HA31 Front Mount Auxiliary Switch - 3 NO, 1 NC

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ManufacturerSiemens

Part number3RH2911-1HA31

Contacts 3 NO, 1 NC

Mounting Front

Terminals Screw

Compatibility 3RT2 (S00-S2), 3RH2

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

Product description

The Siemens 3RH2911-1HA31 is a front-mounting auxiliary switch block that adds three Normally Open (NO) and one Normally Closed (NC) contact to Siemens SIRIUS 3RT2 contactors and 3RH2 contactor relays. It features screw terminals for secure electrical connections and a snap-on design for easy front installation, significantly expanding the control and signaling capabilities of your equipment.

This auxiliary switch is engineered for applications requiring a majority of break contacts, making it ideal for complex interlocking schemes, safety circuits, and detailed status monitoring in industrial automation. The three NO contacts close upon energization of the main contactor/relay, 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 distributor of surplus industrial automation parts, offers the Siemens 3RH2911-1HA31 auxiliary switch. We provide reliable, quality components at competitive prices, supporting your MRO needs and ensuring your operations run efficiently.

Technical specifications

Contacts	3 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

Safety Circuits

Complex Interlocking

Industrial Automation

Signaling

Compatible systems

Siemens 3RT2 (S00-S2) Siemens 3RH2

Also known as

Siemens 3RH2911-1HA31 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. It replaces the older Siemens 3RH1911-1HA31 part.

Technical note

Expert tip

The snap-on mounting design allows for quick and tool-free installation of the 3RH2911-1HA31 auxiliary switch onto the front of compatible Siemens 3RT2 contactors and 3RH2 contactor relays.

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Frequently asked questions

What is the contact configuration of the Siemens 3RH2911-1HA31?

The Siemens 3RH2911-1HA31 auxiliary switch block features three Normally Open (NO) contacts and one Normally Closed (NC) contact. This configuration is beneficial for creating multiple break signals and fewer make signals in control circuits.