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Siemens 3TK2830-2CB30 SIRIUS Safety Relay - 24V AC/DC

Siemens 3TK2830-2CB30 SIRIUS Safety Relay

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ManufacturerSiemens

Part number3TK2830-2CB30

Voltage 24V AC/DC

Width 22.5 mm

Terminals Spring-type

EC Instantaneous 4 NO

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4 NO instantaneous EC contacts 1 MK feedback/retraction contact 24V AC/DC operation Spring-type terminals 22.5mm width Expansion unit capability

Product description

The Siemens 3TK2830-2CB30 is a SIRIUS safety relay designed for monitoring safety-related circuits. It operates on 24V AC or DC and features a 22.5mm width with spring-type terminals for ease of installation. This expansion unit provides 4 normally open (NO) instantaneous enabling circuits (EC) and no delayed enabling circuits. It also includes one feedback/retraction monitoring contact (MK).

This safety relay is intended for use as an expansion unit, enhancing the functionality of a base safety relay. It can achieve SIL 3 / PL e ratings when part of a complete safety system.

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Technical specifications

Voltage	24V AC/DC
Width	22.5 mm
Terminals	Spring-type
EC Instantaneous	4 NO
EC Delayed	0
MK	1 NC
SIL	Up to 3
PL	Up to e
Type	Expansion Unit

Common applications

Machine safety

Industrial control

Safety monitoring

Automation panels

Compatible systems

Designed for integration into Siemens safety control architectures.

Also known as

Siemens SIRIUS Expansion Unit 24V AC/DC Safety Relay

Replaces / compatible with

This unit is part of the SIRIUS safety relay family and its successor is the 3SK1211-2BB40. Consult Siemens for precise replacement details.

Technical note

Expert tip

Spring-type terminals can offer faster installation and vibration resistance compared to screw terminals.

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Frequently asked questions

What is the difference between the 3TK2830-1CB30 and 3TK2830-2CB30 Siemens safety relays?

The main difference lies in the terminal type: the 3TK2830-1CB30 uses screw terminals, while the 3TK2830-2CB30 features spring-type terminals for faster connections.