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Siemens 3TH4355-0LC8 Contactor Relay - 33V DC, 5 NO / 5 NC, Varistor

Siemens 3TH4355-0LC8 Contactor Relay, 33V DC, with integrated varistor.

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ManufacturerSiemens

Part number3TH4355-0LC8

Manufacturer Siemens

Part Number 3TH4355-0LC8

Series 3TH43

Rating 55E

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5 Normally Open Contacts 5 Normally Closed Contacts Screw Terminal Connections 33V DC Coil Voltage Integrated Varistor for Surge Protection EN 50011 Compliant

Product description

The Siemens 3TH4355-0LC8 is a 55E series contactor relay designed for DC operation. It is equipped with 5 normally open (NO) and 5 normally closed (NC) contacts, screw terminals, and a 33V DC coil. A key feature of this model is the integrated varistor for overvoltage protection.

This relay is ideal for applications requiring reliable DC switching in industrial environments, including motor control, automation, and power distribution. The integrated varistor offers protection against voltage spikes, enhancing the longevity of the relay and connected equipment.

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Technical specifications

Manufacturer	Siemens
Part Number	3TH4355-0LC8
Series	3TH43
Rating	55E
Contacts	5 NO + 5 NC
Terminals	Screw
Coil Voltage	33V DC
Operation	DC Operation
Features	Integrated Varistor
Standard	EN 50011

Common applications

DC Motor Control

Industrial Automation

Control Panels

Power Distribution

Systems with Voltage Spike Concerns

HVAC

Compatible systems

Control circuits requiring 33V DC switching EN 50011 compatible systems with surge protection needs

Also known as

Siemens 3TH4355-0LC8 Siemens Contactor Relay 55E DC Siemens 33V DC Relay

Replaces / compatible with

Suitable for replacing older Siemens 55E series contactor relays, especially in applications where overvoltage protection is beneficial. Compatible with EN 50011 systems.

Technical note

Expert tip

The integrated varistor on the 3TH4355-0LC8 is designed to suppress transient overvoltages; however, for severe surge conditions, external protection may still be necessary.

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Frequently asked questions

What is the purpose of the integrated varistor in the Siemens 3TH4355-0LC8?

The integrated varistor in the Siemens 3TH4355-0LC8 acts as a surge suppressor. It protects the relay's coil and connected control circuitry from damaging voltage spikes, thereby increasing reliability and lifespan.