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Siemens 3RT1017-1BB42 SIRIUS 3RT DC Power Contactor

Siemens 3RT1017-1BB42 3-pole DC Power Contactor

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ManufacturerSiemens

Part number3RT1017-1BB42

Type Power Contactor

Manufacturer Siemens

Series SIRIUS 3RT

Part Number 3RT1017-1BB42

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AC-3 Rated Current 12A 5.5 kW Power 3-Pole 1 NC Auxiliary Contact 24V DC Coil Size S00

Product description

The Siemens 3RT1017-1BB42 is a 3-pole power contactor within the SIRIUS 3RT series, designed for AC-3 applications at 12A and 5.5 kW (400V). This DC-operated contactor features a 24V DC coil and one normally closed (NC) auxiliary contact. It is a Size S00 unit with screw terminals.

This DC-operated power contactor is suitable for control circuits requiring a normally closed auxiliary contact, often used for interlocking, signaling, or safety functions in DC-powered systems. Applications include industrial automation, control panels, and machinery operating with 24V DC control voltage.

Stanlo Automation, a veteran-owned surplus parts distributor, provides access to essential industrial automation components. We offer the Siemens 3RT1017-1BB42, helping businesses maintain operations and manage costs with reliable surplus inventory.

Technical specifications

Type	Power Contactor
Manufacturer	Siemens
Series	SIRIUS 3RT
Part Number	3RT1017-1BB42
AC-3 Current	12 A
Power	5.5 kW @ 400 V
Poles	3
Auxiliary Contacts	1 NC
Coil Voltage	24 V DC
Size	S00
Terminals	Screw

Common applications

Motor Control

Industrial Automation

DC Control Circuits

Safety Interlocks

Signaling Systems

Control Panels

Compatible systems

Siemens 3RT overload relays SIRIUS modular system components

Also known as

Siemens 3RT1017-1BB42 Contactor SIRIUS 3RT1017-1BB42 Siemens 24V DC NC Contactor

Replaces / compatible with

This part is a phased-out product. The preferred successor is the Siemens SIRIUS 3RT2017-1BB42.

Technical note

Expert tip

The NC auxiliary contact on the 3RT1017-1BB42 is crucial for implementing reliable safety interlock circuits in DC control systems.

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Frequently asked questions

What is the function of the NC contact on the Siemens 3RT1017-1BB42?

The Siemens 3RT1017-1BB42 includes a normally closed (NC) auxiliary contact. This contact remains closed when the main power poles are open and opens when the contactor coil is energized, making it useful for safety interlocks or status feedback.