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Siemens 3TC4817-0LB4 DC Contactor | 75A Aux, 24V DC, Varistor

Siemens 3TC4817-0LB4 2-pole DC Contactor with varistor and 75A auxiliary contacts.

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ManufacturerSiemens

Part number3TC4817-0LB4

Type Contactor

Manufacturer Siemens

Frame Size 4

Poles 2

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Integrated varistor and series resistor 75A auxiliary contacts (2 NO + 1 NC) DC-3 and DC-5 operation Frame size 4 for heavy-duty use 24V DC coil Wide operating range

Product description

The Siemens 3TC4817-0LB4 is a 2-pole contactor designed for DC-3 and DC-5 operation. It features a frame size 4, a 75A auxiliary switch with 2 NO + 1 NC contacts, a 24V DC coil, and includes an integrated varistor and series resistor for transient suppression. The operating range is 0.7 to 1.25 x Us.

This contactor is engineered for demanding DC switching applications where surge protection is beneficial, such as in automated machinery, power control systems, and industrial DC circuits. It is used across various sectors including process automation and energy systems.

Stanlo Automation, your veteran-owned source for surplus industrial parts, carries the Siemens 3TC4817-0LB4. We are committed to providing high-quality, cost-effective components for your automation needs.

Technical specifications

Type	Contactor
Manufacturer	Siemens
Frame Size	4
Poles	2
Auxiliary Contacts	21 (2 NO + 1 NC)
Coil Voltage	24 V DC
Operating Range	0.7-1.25 x Us

Common applications

DC Motor Control

Industrial DC Power

Automation Systems

Surge Protection Circuits

Process Automation

Energy Systems

Compatible systems

DC Control Systems Industrial Automation Panels Siemens Motor Starters Systems requiring transient suppression

Also known as

Siemens 3TC4817-0LB4 DC Contactor Siemens Contactor with Varistor

Replaces / compatible with

This contactor with integrated surge protection is suitable for DC applications where transient voltages can be a concern. Consult Siemens technical data for specific equivalencies.

Technical note

Expert tip

The integrated varistor provides protection against voltage spikes; ensure it is correctly connected within the circuit.

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Frequently asked questions

What surge protection features does the Siemens 3TC4817-0LB4 contactor include?

The Siemens 3TC4817-0LB4 contactor is equipped with an integrated varistor and a series resistor to help suppress voltage transients, protecting downstream components. It operates with a 24V DC coil.