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Siemens 3RT1017-1JB42 SIRIUS 3RT DC Power Contactor

Siemens 3RT1017-1JB42 3-pole DC Power Contactor w/ Diode

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ManufacturerSiemens

Part number3RT1017-1JB42

Type Power Contactor

Manufacturer Siemens

Series SIRIUS 3RT

Part Number 3RT1017-1JB42

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

Product description

The Siemens 3RT1017-1JB42 is a 3-pole power contactor from the SIRIUS 3RT series, rated for AC-3 at 12A and 5.5 kW (400V). It features a 24V DC coil with integrated suppressor (diode) for 0.7-1.25* Us, and one normally closed (NC) auxiliary contact. This Size S00 contactor uses screw terminals.

This DC-operated power contactor includes an integrated suppression diode to protect control circuits from voltage spikes generated when the coil is de-energized. The NC auxiliary contact is useful for interlocking and signaling. Applications include industrial automation, control panels, and machinery requiring DC control and coil protection.

Stanlo Automation, a veteran-owned surplus parts distributor, offers essential industrial components like the Siemens 3RT1017-1JB42. We provide cost-effective solutions for your MRO needs, ensuring access to reliable automation parts from phased-out product lines.

Technical specifications

Type	Power Contactor
Manufacturer	Siemens
Series	SIRIUS 3RT
Part Number	3RT1017-1JB42
AC-3 Current	12 A
Power	5.5 kW @ 400 V
Poles	3
Auxiliary Contacts	1 NC
Coil Voltage	24 V DC (0.7-1.25* Us) with Diode
Size	S00
Terminals	Screw

Common applications

Motor Control

Industrial Automation

DC Control Circuits

Coil Protection

Safety Interlocks

Control Panels

Compatible systems

Siemens 3RT overload relays SIRIUS modular system components

Also known as

Siemens 3RT1017-1JB42 Contactor SIRIUS 3RT1017-1JB42 Siemens 24V DC Contactor Diode

Replaces / compatible with

This part is a phased-out product. The preferred successor is the Siemens SIRIUS 3RT2017-1JB42.

Technical note

Expert tip

The built-in suppressor diode on the 3RT1017-1JB42 coil significantly reduces back EMF, simplifying control circuit design by eliminating the need for external suppression components.

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Frequently asked questions

Why does the Siemens 3RT1017-1JB42 have an integrated diode?

The integrated diode in the Siemens 3RT1017-1JB42 acts as a suppressor, protecting sensitive control electronics from inductive voltage spikes when the 24V DC coil is de-energized, thus enhancing system reliability.