Safety Relays
A safety relay is a control device that monitors safety elements such as emergency stop buttons, light barriers and door switches with redundant circuits and safely cuts the machine's motion in a hazardous situation. It is used to implement the safety function required by the risk assessment on machines where the operator can reach the hazardous area, such as presses and robot cells. The category includes Siemens 3SK1 and configurable 3SK2, Schneider Electric XPS and ABB safety relays and expansion modules; the product data lists models rated Category 4, SIL 3 and PL e, and types with delayed outputs. Choose the relay according to the performance level (PL) or SIL value resulting from the risk assessment, the type of safety element to be connected, the number of safe outputs, the reset method and the supply voltage. The performance level is determined under EN ISO 13849-1 and SIL under IEC 62061, and the assessment covers the entire safety chain. A standard control relay is not a substitute for a safety relay because it does not have a redundant structure that monitors its own faults.
Products
- Siemens 3TK2810-1BA42 Safety Relay — Siemens · SKU: 3TK2810-1BA42 · TRY 113,538.00 · Made to order
- Siemens 3ZY1212-4GA01 Device Connector Set, for 3SK2 safety relay, 45 mm — Siemens · SKU: 3ZY1212-4GA01 · TRY 2,041.00 · Made to order
- Siemens 3SK1121-2CB44 Safety Relay Cat 4/Sil 3/Pl e — Siemens · SKU: 3SK1121-2CB44 · TRY 29,185.00 · Made to order
- Siemens 3TK2810-0BA02 Safety Relay — Siemens · SKU: 3TK2810-0BA02 · TRY 70,228.00 · Made to order
- Siemens 3TK2810-0GA02 Safety Relay — Siemens · SKU: 3TK2810-0GA02 · TRY 70,228.00 · Made to order
- Siemens 3ZY1212-2GA00 Device Connector, for 3SK2 safety relay, 22.5 mm — Siemens · SKU: 3ZY1212-2GA00 · TRY 1,546.00 · Made to order
- Siemens 3SK1121-2CB42 Safety Relay Cat 4/Sil 3/Pl e — Siemens · SKU: 3SK1121-2CB42 · TRY 29,185.00 · Made to order
- Siemens 3SK1121-2CB41 Safety Relay Cat 4/Sil 3/Pl e — Siemens · SKU: 3SK1121-2CB41 · TRY 29,185.00 · Made to order
- Siemens 3SK1122-2CB42 Safety Relay Cat 4/Sil 3/Pl e — Siemens · SKU: 3SK1122-2CB42 · TRY 17,477.00 · Made to order
- Siemens 3SK1122-2CB41 Safety Relay Cat 4/Sil 3/Pl e — Siemens · SKU: 3SK1122-2CB41 · TRY 17,477.00 · Made to order
- Siemens 3SK2941-2AA11 Starter Set, for 3SK2 safety relay — Siemens · SKU: 3SK2941-2AA11 · TRY 42,379.00 · Made to order
- Siemens 3TK2810-1KA42 Safety Relay — Siemens · SKU: 3TK2810-1KA42 · TRY 117,050.00 · Made to order
- Siemens 3SK1230-2AW20 Safety Relay Power supply — Siemens · SKU: 3SK1230-2AW20 · TRY 10,916.00 · Made to order
- Siemens 3SK1211-2BB40 Safety Relay Cat 4/Sil 3/Pl e — Siemens · SKU: 3SK1211-2BB40 · TRY 15,870.00 · Made to order
- Siemens 3SK2122-2AA10 Safety Relay — Siemens · SKU: 3SK2122-2AA10 · TRY 53,218.00 · Made to order
- Siemens 3SK1122-2CB44 Safety Relay Cat 4/Sil 3/Pl e — Siemens · SKU: 3SK1122-2CB44 · TRY 17,477.00 · Made to order
- Siemens 3SK2511-2FA10 Safety Relay 3SK2 PROFINET Communication Module* — Siemens · SKU: 3SK2511-2FA10 · TRY 32,722.00 · Made to order
- Siemens 3SK2112-2AA10 Safety Relay — Siemens · SKU: 3SK2112-2AA10 · TRY 36,134.00 · Made to order
- Siemens 3SK2942-2AA11 Safety Relay — Siemens · SKU: 3SK2942-2AA11 · TRY 97,235.00 · Made to order
- Schneider Electric XPSMCMCO0000EC Communication (non-safe) modules - EtherCAT — Schneider Electric · SKU: XPSMCMCO0000EC · TRY 63,105.66 · Made to order
- Schneider Electric TM3SAK6R Safety module, light barrier, CAT3, 3 function — Schneider Electric · SKU: TM3SAK6R · TRY 38,752.99 · Made to order
- Schneider Electric TM3SAC5R Safety module, switch control, CAT3, 1 function — Schneider Electric · SKU: TM3SAC5R · TRY 32,025.43 · Made to order
- Schneider Electric XPSMCMCO0000EM Communication (non-safe) modules - Modbus TCP — Schneider Electric · SKU: XPSMCMCO0000EM · TRY 63,105.66 · Made to order
- Schneider Electric TM3SAF5R Safety module, switch control, CAT4, 1 function — Schneider Electric · SKU: TM3SAF5R · TRY 35,639.41 · Made to order
- Schneider Electric VW3M3501 Safety Module — Schneider Electric · SKU: VW3M3501 · TRY 41,532.98 · Made to order
How to choose Safety Relays
A safety relay is a control device that monitors safety elements such as emergency stop buttons, light barriers and door switches with redundant circuits and safely cuts the machine's motion in a hazardous situation. It is used to implement the safety function required by the risk assessment on machines where the operator can reach the hazardous area, such as presses and robot cells.
- Separate sensing, motion control, logic processing and operator interface requirements.
- Select signal type, supply voltage, communication protocol and I/O count for the machine network.
- Verify housing size, sensing distance and PNP/NPN output polarity against the PLC input card.
Frequently asked questions
What is Safety Relays and where is it used?
A safety relay is a control device that monitors safety elements such as emergency stop buttons, light barriers and door switches with redundant circuits and safely cuts the machine's motion in a hazardous situation. It is used to implement the safety function required by the risk assessment on machines where the operator can reach the hazardous area, such as presses and robot cells.
What should I compare when choosing Safety Relays?
Choose the relay according to the performance level (PL) or SIL value resulting from the risk assessment, the type of safety element to be connected, the number of safe outputs, the reset method and the supply voltage.
Where can I find technical details for Safety Relays products?
A standard control relay is not a substitute for a safety relay because it does not have a redundant structure that monitors its own faults.
Safety Relays Selection Guide: Technical Criteria and Engineering Practice