Siemens
Siemens 3SK1121-2AB40 SIRIUS Safety Relay (24V DC, Spring-Type)
Siemens 3SK1121-2AB40 SIRIUS safety relay, Advanced series, 24V DC.
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Same-day dispatch
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Veteran-owned
CAGE: 9NK75
SIRIUS Advanced series
Electronic safety relay
3 enabling contacts (NO)
1 signaling contact (NC)
24V DC operation
Spring-type terminals
Product description
The Siemens 3SK1121-2AB40 is a SIRIUS safety relay from the Advanced series, functioning as a basic unit. It is designed for robust safety monitoring in industrial environments.
This relay offers three Normally Open (NO) contacts for enabling circuits and one Normally Closed (NC) contact for signaling. It operates on a 24 V DC supply voltage and features convenient spring-type (push-in) terminals for quick and secure wiring.
As a veteran-owned surplus parts distributor, Stanlo Automation is your source for the Siemens 3SK1121-2AB40. Rely on us for cost-effective, high-quality components to maintain your automation systems.
Technical specifications
| Part Number | 3SK1121-2AB40 |
| Manufacturer | Siemens |
| Product Type | Safety Relay |
| Series | SIRIUS Advanced |
| Unit Type | Basic Unit |
| Enabling Circuits | 3 NO (Normally Open) |
| Signaling Circuit | 1 NC (Normally Closed) |
| Supply Voltage (Us) | 24 V DC |
| Terminal Type | Spring-type (push-in) |
Common applications
Emergency stop monitoring
Safety gate monitoring
Machine safety
Industrial control panels
Safety interlocks
Hazardous area control
Compatible systems
Safety sensors (E-stops, gate switches)
24V DC power supplies
Control panels
Industrial automation systems
Also known as
Siemens SIRIUS 3SK1121-2AB40
3SK1121-2AB40 Safety Relay
Siemens Spring Terminal Safety Relay
Replaces / compatible with
This advanced safety relay with spring-type terminals offers a faster and more secure wiring solution compared to traditional screw terminals for various safety monitoring tasks.
Technical note
Expert tip
For the 3SK1121-2AB40, ensure that the conductors are properly inserted into the spring-type terminals to guarantee a secure electrical connection and prevent nuisance tripping.What happens next?
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Frequently asked questions
What are the benefits of using spring-type terminals on the 3SK1121-2AB40?
The spring-type (push-in) terminals on the Siemens 3SK1121-2AB40 offer faster installation, increased vibration resistance, and eliminate the need for manual screw tightening. This leads to more reliable connections and reduced maintenance time.