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Siemens 5ST3012

Name: Auxiliary Switch, 2NC, UR
Brand: Siemens
SKU: 5ST3012

Auxiliary Switch, 2NC, UR

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Product Description

Lifecycle Status:

The Siemens Auxiliary Switch, 2NC, UR is a reliable and efficient solution designed to enhance the control of supplementary protectors. Equipped with two normally closed (2NC) contacts, this auxiliary switch ensures secure and precise operation. It is compatible with Siemens 5SP4, 5SY4, and 5SY5 series supplementary protectors, making it a versatile addition to your electrical control systems.

Engineered for both AC and DC applications, the auxiliary switch supports AC ratings of B300 and DC ratings of P300. This flexibility allows it to be used in a wide range of industrial and automation environments. The switch is built to meet stringent industry standards, ensuring high performance and durability.

Whether you are upgrading existing systems or implementing new installations, the Siemens Auxiliary Switch provides the reliability and functionality needed for optimal control and protection. Its robust design and compliance with UR standards make it a trusted choice for professionals in the field.

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Offer details

Offer from:: Trusted supplier — Germany, member since 2024
Availability:: 6 pcs.
In-Stock
Updated at: 15-09-2026
Warranty:: 24 months
Condition:: New Surplus

New Surplus - A new, unused, undamaged item without a manufacturer guarantee. The item may come without original packaging or in replacement packaging. If provided, the box may have been opened.

The Seller is responsible for shipping the product and invoicing

Specifications

Brand: Siemens
Rated voltage: 400 V
Device fitting: Universal
Attached at delivery
Voltage type for actuating: DC
Number of fault-signal switches: 0
Additional equipment: Auxiliary switch

Available Offers

(7)

Condition	Availability	Supplier	Warranty
Condition New Surplus	Availability 6 pcs. In-Stock Updated at: 15-09-2026	Supplier GermanyTrusted supplier — member since 2024	Warranty 24 months
Condition New Factory Sealed	Availability 23 pcs. In-Stock Updated at: 31-10-2025	Supplier United KingdomTrusted supplier — member since 2021	Warranty Not specified
Condition New Surplus	Availability 23 pcs. In-Stock Updated at: 17-09-2026	Supplier GermanyTrusted supplier — member since 2023	Warranty 12 months
Condition New Factory Sealed	Availability 5 pcs. In-Stock Updated at: 17-09-2026	Supplier PolandTrusted supplier — member since 2023, 50–99 employees	Warranty 24 months
Condition New Surplus	Availability On requestLead time: 15 days	Supplier NetherlandsTrusted supplier — member since 2021, 100–499 employees	Warranty 24 months
Condition New Factory Sealed	Availability On requestLead time: 10 days	Supplier GermanyTrusted supplier — member since 2024	Warranty Not specified

Offer with manufacturer lead time

Directly from the manufacturer - with a confirmed, predictable, and fully transparent delivery time.

Documents

Data Sheet

Datasheet for Siemens 5ST3012, including specifications and features.

Download Data Sheet

CAD Models

3D CAD model and technical drawings, ready for your design software.

Download CAD Model

Product data updated: 15-09-2026

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