siemens
Siemens SIRIUS 3SK Safety Relay
Model: 3SK1111-1AB30
4-hour response · Pricing in SAR · Delivery across all KSA regions
3SK1111-1AB30 — Siemens SIRIUS 3SK Safety Relay
The Siemens SIRIUS 3SK safety relay is the standard safety circuit monitoring device for machine guarding, emergency stop, and two-hand control in Saudi Arabia's industrial machinery — standing between hazardous machine motion and human operators by monitoring safety circuit integrity and de-energising machine actuators when a guard opens, an E-stop is pressed, or a safety circuit fault is detected. The 3SK range provides safety integrity to Category 4 / SIL 3 / PLe per EN ISO 13849-1 and IEC 62061, the highest achievable levels for proven technology safety functions, covering machine guarding requirements from simple one-person guarded machines through to complex multi-operator robotic cell safety systems.
The 3SK's dual-channel input monitoring evaluates both channels simultaneously and cross-monitors for divergence — a single channel fault is detected within 100 ms and results in a safe output state. The three normally-open safety output contacts are force-guided (mechanically linked): if one contact welds closed due to a fault, the mechanical linkage prevents the other contacts from reaching their open position — a physical condition detectable by the relay's internal monitoring, preventing unsafe restart. The 3SK1 range mounts on 22.5 mm DIN rail at 24 V DC, directly compatible with PLC transistor output switching.
In Saudi Arabia, the SIRIUS 3SK is increasingly mandatory following progressive adoption of EN ISO 13849 and IEC 62061 in ARAMCO, SABIC, and SEC vendor requirements. OEM machine builders exporting to European markets require 3SK-class relays for CE Machinery Directive compliance, and Saudi panel builders in MODON zones build 3SK-based safety circuits as standard modules for conveyor, press, robot, and crane control panels.
Razz Middle East supplies 3SK1 and 3SK2 in all variants — E-stop, guard, two-hand, ESPE, muting — with SIL/PL assessment documentation and commissioning verification support.
Technical Specifications
Full specifications for the 3SK1111-1AB30
- Safety Level
- Category 4 / SIL 3 / PLe (EN ISO 13849, IEC 62061)
- Monitored Functions
- E-stop, safety gate, two-hand, ESPE
- Input
- 2-channel with cross-fault detection (<100 ms)
- Safety Outputs
- 3 NO force-guided contacts
- Response Time
- <10 ms to safe state
- Supply
- 24 V DC
- Mounting
- DIN rail 22.5 mm
- Standard
- EN ISO 13849-1, IEC 62061
Key Features & Benefits
- Category 4 / SIL 3 / PLe safety integrity achieved through dual-channel input monitoring, cross-fault detection within 100 ms, and force-guided output contacts — the highest achievable level for proven technology safety functions.
- Force-guided output contacts physically prevent partial contact operation if one contact welds closed, making the weld condition detectable by internal monitoring and preventing unsafe machine restart.
- 24 V DC supply with PLC transistor output compatibility eliminates intermediate interface relays between the PLC safety output and 3SK control input, reducing panel component count.
- Expandable output module range allows one 3SK monitoring relay to control multiple independent safety circuits beyond the standard 3 NO outputs.
- Restart inhibit function requires a deliberate start command after every E-stop or guard opening event before the machine resumes — fundamental to EN ISO 13849 Category 3 and 4 applications.
- Status LED indication shows power, safety circuit health, output state, and fault conditions, providing immediate visual diagnostic information during commissioning and maintenance.
- Full range of monitored functions — E-stop, gate/guard, two-hand, ESPE/light curtain, and muting — covered by a single product family with matched expansion modules.
Industrial Applications in Saudi Arabia
- Emergency stop monitoring in industrial machine panels at MODON manufacturing zones, where EN ISO 13849 Category 4 compliance is required by ARAMCO and SABIC vendor safety audit assessments.
- Safety gate and guard door monitoring on conveyor systems, packaging machines, and robot workcells in Saudi food, pharmaceutical, and electronics manufacturing facilities.
- Two-hand control station monitoring for power press and stamping machines at Saudi metal fabrication facilities, ensuring operator hands are clear before each press stroke.
- Light curtain (ESPE) interface for automatic machine loading and robotic handling systems, providing the safety relay function between ESPE output and machine drive Safe Torque Off input.
- Muting circuit implementation for material entry and exit points on automated conveyor lines, temporarily suspending the light curtain during product transport.
- CE Machinery Directive compliance safety circuits for Saudi OEM machines exported to European and GCC markets, required for machine safety documentation in the Technical File.
- Retrofit safety system upgrades for existing industrial machinery at Saudi petrochemical and manufacturing facilities, replacing obsolete electromechanical safety relays without panel redesign.
Industrial Supplier in Saudi Arabia
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Frequently Asked Questions — 3SK1111-1AB30
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