Safety Relays

What are they?
A safety relay is a device that monitors for potential errors or faults in machinery or plants and works to prevent injury and reduce risk. When an error occurs, the safety relay initiates a response to bring the risk back to a safe, acceptable level. Safety relays protect both machinery and employees, preventing potential expensive maintenance and equipment replacement.
Example functions include initiating a controlled pause in machinery or equipment to safely stop movement. They can also be used as an emergency stop mechanism, switching off the power to particular machinery or plants.
Single function or multi-function?
Safety relays can be single function or multi-function. Single function relays monitor a specific type of activity while multi-function safety relays can monitor different functions. Multi-function safety relays can be used in place of several single function, individual units.
The benefits of using multi-function relays include simpler installation and less wiring. As fewer individual units are needed, using multi-function relays can also free up panel space. Multi-function safety relays give you greater flexibility to make changes within the design or panel.
Where would you find a safety relay?
Safety relays 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
Who uses them?
Anyone can integrate a safety relay within a circuit to create a safety circuit without any specific training.

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Omschrijving Prijs Supply Voltage Number of Channels Auxiliary Contacts Function Safety Category ISO 13849-1 SIL IEC 61508 PL ISO 13849-1 Safety Contacts Range Reset Method Safety Category Terminal Type Standards Met Configurable
RS-stocknr. 447-4499
FabrikantnummerXPSAC3721
€ 147,69
Each
Aantal stuks
230 V ac - 1 Emergency Stop - - - 3 Preventa - - Screw - -
RS-stocknr. 712-5260
Fabrikantnummer2986960
FabrikantPhoenix Contact
€ 112,88
Each
Aantal stuks
24 V dc - - - - - - 3 - - 3 Screw - -
RS-stocknr. 784-5800
Fabrikantnummer3SK1121-1AB40
FabrikantSiemens
€ 195,65
Each
Aantal stuks
24 V dc 1 - - - - - 4 SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 155-844
Fabrikantnummer750106
FabrikantPilz
€ 327,80
Each
Aantal stuks
24 V dc 2 1 Two-Hand Control - - - 3 PNOZsigma Monitored - Screw - -
RS-stocknr. 464-491
FabrikantnummerXPSATE5110P
€ 321,48
Each
Aantal stuks
24 V dc 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock - - - 2 Preventa Automatic, Manual - Screw - -
RS-stocknr. 918-6686
Fabrikantnummer777301
FabrikantPilz
€ 185,00
Each
Aantal stuks
24 V ac/dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - 3 PNOZ X Automatic, Manual - Screw - -
RS-stocknr. 751-0936
Fabrikantnummer440R-M23143
€ 239,00
Each
Aantal stuks
24 V ac/dc - 1 Light Beam/Curtain, Safety Switch/Interlock 4 3 E 2 Minotaur Automatic, Manual, Monitored - Screw - -
RS-stocknr. 751-1037
Fabrikantnummer440R-S13R2
€ 202,00
Each
Aantal stuks
24 V dc 2 1 Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock 4 3 E 3 - Automatic, Manual, Monitored - Screw - Yes
RS-stocknr. 757-9323
FabrikantnummerG9SA-501 AC100-240
FabrikantOmron
€ 292,26
Each
Aantal stuks
100 → 240 V ac 2 1 Emergency Stop - - - 5 - - - - - -
RS-stocknr. 489-6366
Fabrikantnummer777602
FabrikantPilz
€ 232,90
Each
Aantal stuks
24 V dc 1, 2 - Safety Switch/Interlock - - - 2 PNOZ X Automatic, Manual PLe Category 4 Screw - -
RS-stocknr. 239-1083
Fabrikantnummer774340
FabrikantPilz
€ 464,50
Each
Aantal stuks
24 V dc 1, 2 1 Two-Hand Control - - - 3 PNOZ X Monitored PLe Category 4, SIL CL3 Screw - -
RS-stocknr. 812-8951
Fabrikantnummer119380 & ESR5-NO-31-230VAC
FabrikantEaton
€ 162,74
Each
Aantal stuks
- 2 - Emergency Stop, Safety Switch/Interlock - - - 3 - Automatic, Manual - Screw - -
RS-stocknr. 784-5790
Fabrikantnummer3SK1112-1BB40
FabrikantSiemens
€ 122,67
Each
Aantal stuks
24 V dc 1 - - - - - - SIRIUS Automatic, Monitored - Screw - -
RS-stocknr. 814-6924
FabrikantnummerXPSAC3421P
€ 165,00
Each
Aantal stuks
115 V ac 1 1 Emergency Stop, Safety Switch/Interlock - - - 3 Preventa Monitored - Screw - -
RS-stocknr. 447-5559
Fabrikantnummer440R-N23114
€ 115,00
Each
Aantal stuks
24 V ac/dc 2 - Light Beam/Curtain, Safety Switch/Interlock - - - 2 Minotaur Automatic, Manual CAT 4, PL e, SIL CL3 - - -
RS-stocknr. 890-3382
FabrikantnummerG9SE-401-DC24
FabrikantOmron
€ 123,90
Each
Aantal stuks
24 V dc 2 1 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - 4 - Automatic, Manual - Screw CAN C22.2 No.14, CSA C22.2 No.14, EN 62061 SIL3, EN 81-1, EN 81-2, EN ISO 13849-1: 2008 PL e Safety Category 4, EN/IEC 60947-5-1, GB 14048.5, IEC 62061 SIL 3, UL508 -
RS-stocknr. 741-8641
FabrikantnummerSRB301AN 24VAC/DC
FabrikantSchmersal
€ 277,46
Each
Aantal stuks
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Mat/Edge, Safety Switch/Interlock - - - 4 PROTECT - - - - -
RS-stocknr. 741-8666
FabrikantnummerSRB324ST 24V (V.3)
FabrikantSchmersal
€ 317,15
Each
Aantal stuks
24 V ac/dc 1, 2 - Light Beam/Curtain, Safety Switch/Interlock - - - - PROTECT - - Screw - -
RS-stocknr. 656-6051
FabrikantnummerRK5942.03 AC/DC24V
FabrikantDold
€ 115,42
Each
Aantal stuks
24 V ac/dc 1 - Emergency Stop - - - - Safemaster - - Screw - -
RS-stocknr. 447-5688
Fabrikantnummer440R-N23132
€ 178,00
Each
Aantal stuks
24 V ac/dc 1 1 Light Beam/Curtain, Safety Switch/Interlock - - - 3 Minotaur Automatic, Manual CAT 4, PL e, SIL CL3 Screw - -