Safety Relays

A safety relay is an automation device that monitors for potential errors or faults in machinery or plants and works to prevent injury and reduce risk. If an error occurs, the safety relay initiates the appropriate response to reduce the risk and bring the environment back to a safe, acceptable level. Monitoring processes using safety relays protects both the machinery and the employees, prevents potential expensive maintenance and equipment replacement, and reduces risk of human injury.

Example functions include initiating a controlled pause in machinery or equipment to safely stop movement until an obstacle is removed. They can also be used as an emergency stop mechanism, switching off the power to particular machinery or plants until it is safe to resume power and continue.

What types of safety relays are there?

Safety relays can be single function or multi-function. Single function relays monitor for a specific type of activity and are programmed individually to monitor their respective tasks. Multi-function safety relays can monitor different functions and can be used in place of several single function, individual units to monitor the same number of activities.

The benefits of using multi-function relays include simpler installation and less wiring as fewer individual units are needed. This also makes more economical use of panel space, additionally giving greater flexibility to make changes within the design or panel as fewer units need to be removed or repositioned.

Where are safety relays used?

Safety relays are found across many industries where automation is used within a process or for a whole process. Anyone can integrate a safety relay within a circuit to create a safety circuit without any specific training. They are often found in the following control devices:

  • Two hand controls
  • Movable guards
  • Light curtains, light barriers and light grids
  • Magnetic switches
  • Safety mats and pressure sensitive mats
  • Three position devices
  • Non-contact safety sensors
  • Safety switches
  • Emergency stop buttons

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Description Price Supply Voltage Number of Channels Auxiliary Contacts Safety Contacts Function Safety Category ISO 13849-1 Reset Method SIL IEC 61508 PL ISO 13849-1 Range Configurable Terminal Type Standards Met Depth
RS Stock No. 733-2391
Mfr. Part No.2TLA010029R0000 RT9 24DC
BrandABB
kr 1 545,89
Each
Units
24V dc 1, 2 - 2 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 - 3 e - - - - 120mm
RS Stock No. 666-7038
Mfr. Part No.2963912
kr 3 533,87
Each
Units
24V ac/dc 1, 2 1 8 Emergency Stop, Safety Switch/Interlock 4 - 3 e - No Screw - 114.5mm
RS Stock No. 712-5248
Mfr. Part No.2900525
kr 1 728,80
Each
Units
24V ac/dc 2 1 2 Safety Switch/Interlock 4 - 3 e - No Screw - 114.5mm
RS Stock No. 245-1848
Mfr. Part No.774310
BrandPilz
kr 2 407,04
Each
Units
24V ac/dc 2 1 3 Safety Switch/Interlock 4 Automatic, Monitored 3 e PNOZ X - Screw - 121mm
RS Stock No. 447-4477
Mfr. Part No.XPSAC5121
kr 1 788,48
Each
Units
24V ac/dc - 1 3 Emergency Stop 4 - 3 e Preventa - Screw - 114mm
RS Stock No. 741-8653
Mfr. Part No.SRB301ST-24V-(V.2)
BrandSchmersal
kr 3 696,06
Each
Units
24V ac/dc 1, 2 1 3 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 Automatic 3 e PROTECT - Screw - 121mm
RS Stock No. 814-6927
Mfr. Part No.XPSAC5121P
kr 1 995,84
Each
Units
24V ac/dc 1 1 3 Emergency Stop, Safety Switch/Interlock 4 Monitored 3 e Preventa - Screw - 114mm
RS Stock No. 666-7044
Mfr. Part No.2963802
kr 1 550,83
Each
Units
24V ac/dc 1 1 4 Emergency Stop, Safety Switch/Interlock 1 - 1 c - No Screw - 114.5mm
RS Stock No. 836-2738
Mfr. Part No.G7SA5A1BDC24BYOMZ
BrandOmron
kr 387,80
Each
Units
24V dc - - - - - - - - - Yes - - 24mm
RS Stock No. 757-9304
Mfr. Part No.G9SB-3012-A AC/DC24
BrandOmron
kr 2 810,00
Each
Units
24V ac/dc 2 1 3 Emergency Stop 4 - - e - - - - 112mm
RS Stock No. 733-2341
Mfr. Part No.2TLA010026R0000 RT6 24DC
BrandABB
kr 2 060,50
Each
Units
24V dc 1, 2 - 4 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 - 3 e - - - - 120mm
RS Stock No. 757-9310
Mfr. Part No.G9SA-321-T075 AC/DC24
BrandOmron
kr 5 150,00
Each
Units
24V ac/dc 2 1 3 Emergency Stop 3 - - e - - - - 111mm
RS Stock No. 291-3273
Mfr. Part No.OA 5669.12/983/61 DC24V
BrandDold
kr 154,70
Each
Units
- - - - - - - - - - - - - 13mm
RS Stock No. 156-106
Mfr. Part No.750104
BrandPilz
kr 2 326,91
Each
Units
24V dc 2 1 3 Emergency Stop 4 Automatic, Manual, Monitored 3 e PNOZsigma Yes Screw - 120mm
RS Stock No. 245-1854
Mfr. Part No.774318
BrandPilz
kr 2 407,04
Each
Units
24 V dc, 230V ac 2 1 3 Emergency Stop 4 Automatic, Monitored 3 e PNOZ X - Screw - 121mm
RS Stock No. 814-6952
Mfr. Part No.XPSAC3721P
kr 2 060,64
Each
Units
230V ac 1 1 3 Emergency Stop, Safety Switch/Interlock 4 Monitored 3 e Preventa - Screw - 114mm
RS Stock No. 801-6028
Mfr. Part No.2981457
kr 771,18
Each
Units
24V ac/dc 1 - 6 - 3 - 1 - - Yes Cage Clamp - 56mm
RS Stock No. 360-4346
Mfr. Part No.XPSAF5130
kr 1 879,20
Each
Units
24V ac/dc 1, 2 - 3 Safety Switch/Interlock 4 - 3 e Preventa Yes Screw - 114mm
RS Stock No. 240-8670
Mfr. Part No.BN5983.53 DC24V
BrandDold
kr 4 666,22
Each
Units
24V dc 2 1 3 Emergency Stop 4 Monitored 3 e Safemaster - - - 121mm
RS Stock No. 917-6676
Mfr. Part No.2TLA010005R0100 JSBT5 24AC/DC
BrandABB
kr 1 923,00
Each
Units
24V ac/dc 1 1 3 Emergency Stop, Safety Switch/Interlock 4 Automatic 3 e - - Screw - 99mm