Siemens
Siemens 3SK1120-1AB40 SIRIUS Safety Relay (24V DC)
Siemens 3SK1120-1AB40 SIRIUS safety relay, Advanced series, 24V DC.
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SIRIUS Advanced series
Electronic safety relay
Single enabling circuit
0.5A current rating
24V DC operation
Screw terminals
Product description
The Siemens 3SK1120-1AB40 is a SIRIUS safety relay belonging to the Advanced series, functioning as a basic unit. This electronic relay is designed for essential safety monitoring tasks in industrial applications.
It features one enabling circuit with a current rating of 0.5 A and operates on a 24 V DC supply voltage. Connections are made via screw terminals, ensuring a secure and reliable electrical interface.
Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3SK1120-1AB40. Source your industrial automation components from us for quality, reliability, and cost savings.
Technical specifications
| Part Number | 3SK1120-1AB40 |
| Manufacturer | Siemens |
| Product Type | Safety Relay |
| Series | SIRIUS Advanced |
| Unit Type | Basic Unit |
| Enabling Circuits | 1 |
| Current Rating | 0.5 A |
| Supply Voltage (Us) | 24 V DC |
| Terminal Type | Screw Terminal |
Common applications
Single-point safety monitoring
Emergency stop circuits
Machine safety
Industrial control
Safety interlocks
Automation systems
Compatible systems
Emergency stop buttons
Safety switches
24V DC power supplies
Control panels
Also known as
Siemens SIRIUS 3SK1120-1AB40
3SK1120-1AB40 Safety Relay
Siemens 0.5A Safety Relay
Replaces / compatible with
This advanced series safety relay is suitable for applications requiring a single, reliable enabling circuit for safety functions, often used in simpler machine setups.
Technical note
Expert tip
The 0.5A rating on the enabling circuit of the 3SK1120-1AB40 is critical; ensure it matches the requirements of the connected safety devices.What happens next?
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Frequently asked questions
What is the purpose of the single enabling circuit in the 3SK1120-1AB40?
The single enabling circuit in the Siemens 3SK1112-1AB40 is designed to monitor a specific safety input, such as an emergency stop button or a safety switch. When the circuit is open (safety activated), the relay de-energizes, shutting down the controlled machinery.