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Siemens SIRIUS 3TK2821-2CB30

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3TK2821-2CB30

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The Siemens 3TK2821-2CB30 is a safety relay functioning at an input voltage of 24 VAC/DC. This unit features three normally open (NO) delayed contacts and one normally closed (NC) contact, designed for both auto and manual start operations.

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Technical specifications for 3TK2821-2CB30

ManufacturerSiemens
Product TypeSafety Relay
Product LineSIRIUS
Part Number3TK2821-2CB30
UPC754554653358
Weight0.50 lbs (0.23 kg)
SeriesBreakers
Input Voltage24 VAC/DC
Contacts3NO Delayed, 1NC Auto/Manual Start
Contact Rating6 A at 250 VAC
Terminal Type22.5 mm Spring-type Terminal
Delay TimeAdjustable delay for NO contacts
Mounting TypeDIN Rail Mounted
Operating Temperature-25°C to +60°C
Safety CategoryCategory 4 (IEC 61508)
ComplianceCE, UL, EN ISO 13849-1
Maximum Operating Altitude1000 meters above sea level without derating
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The Siemens 3TK2821-2CB30 safety relay is engineered to operate effectively at an input voltage of 24 VAC or DC. It features three normally open delayed contacts and one normally closed contact that can be set for either auto or manual starting. This relay is rated to carry up to 6 A at 250 VAC, providing reliable switching capabilities for various control circuits.

Installation is made straightforward with its DIN rail mounting design and spring-type terminals sized at 22.5 mm. Weighing only 0.20 kg, the unit is lightweight and easy to integrate into existing systems. Users can adjust the delay time for activating the normally open contacts, allowing for customized application needs.

With a robust operating temperature range from -25°C to +60°C, the relay operates well in demanding environments. It meets high safety standards, classified as Category 4 according to IEC 61508, making it suitable for applications requiring stringent safety measures. Furthermore, it is compliant with multiple international standards including CE, UL, and EN ISO 13849-1. This ensures its reliability and effectiveness in safety-focused applications even at high altitudes of up to 1000 meters without any derating of performance.