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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Description Price 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庫存編號 324-7280
製造零件編號774325
BrandPilz
HK$1,390.00
單位
24 V ac/dc 1, 2 - Safety Switch/Interlock 3 3 E 2 PNOZ X - - Screw - -
RS庫存編號 447-4540
製造零件編號XPSDME1132
HK$2,000.00
單位
24 V dc 1, 2 2 Safety Switch/Interlock 4 3 E 2 Preventa - - Screw - -
RS庫存編號 156-106
製造零件編號750104
BrandPilz
HK$3,228.00
單位
24 V dc 2 1 Emergency Stop 4 3 E 3 PNOZsigma Automatic, Manual, Monitored - Screw - Yes
RS庫存編號 447-4499
製造零件編號XPSAC3721
HK$1,090.00
單位
230 V ac - 1 Emergency Stop 4 3 E 3 Preventa - - Screw - -
RS庫存編號 447-4477
製造零件編號XPSAC5121
HK$1,569.13
單位
24 V ac/dc - 1 Emergency Stop 4 3 E 3 Preventa - - Screw - -
RS庫存編號 327-7613
製造零件編號BH5928.92 DC24V 1-10S
BrandDold
HK$3,069.40
單位
24 V ac/dc 1, 2 - Emergency Stop 4 3 E 3 Safemaster - - - - -
RS庫存編號 731-8951
製造零件編號XPSBCE3110P
HK$2,330.00
單位
24 V ac/dc - 1 Two-Hand Control 4 3 E 2 Preventa - - Screw - -
RS庫存編號 701-9212
製造零件編號UE10-2FG2DO
BrandSick
HK$782.17
單位
24 V dc 1, 2 - Light Beam/Curtain 4 3 E 3 - - - Screw - -
RS庫存編號 245-1854
製造零件編號774318
BrandPilz
HK$3,159.19
單位
24 V dc, 230 V ac 2 1 Emergency Stop 4 3 E 3 PNOZ X Automatic, Monitored - Screw - -
RS庫存編號 918-6649
製造零件編號777512
BrandPilz
HK$3,301.36
單位
24 V dc 2 2 Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock - - - 3 PNOZ X Automatic, Manual - Screw - -
RS庫存編號 245-1860
製造零件編號774080
BrandPilz
HK$3,255.50
單位
24 V ac/dc 2 1 Safety Switch/Interlock 4 3 E 7 - Automatic, Manual, Monitored - Screw - -
RS庫存編號 411-2157
製造零件編號3TK2827-1BB40
BrandSiemens
HK$3,200.00
單位
24 V dc 1 1 Safety Switch/Interlock, Speed/Standstill Monitoring 4 3 E 2 SIRIUS Monitored - Screw - -
RS庫存編號 245-1848
製造零件編號774310
BrandPilz
HK$2,123.68
單位
24 V ac/dc 2 1 Safety Switch/Interlock 4 3 E 3 PNOZ X Automatic, Monitored - Screw - -
RS庫存編號 245-1905
製造零件編號774500
BrandPilz
HK$4,114.85
單位
24 V dc 2 - Safety Switch/Interlock 4 3 E 2 PNOZ X Automatic, Manual, Monitored - Screw - -
RS庫存編號 757-9304
製造零件編號G9SB-3012-A AC/DC24
BrandOmron
HK$1,412.40
單位
24 V ac/dc 2 1 Emergency Stop 4 - E 3 - - - - - -
RS庫存編號 836-2738
製造零件編號G7SA5A1B24DC
BrandOmron
HK$293.92
單位
24 V dc - - - - - - - - - - - - Yes
RS庫存編號 464-495
製造零件編號XPSATE3710P
HK$3,711.48
單位
230 V ac 2 4 Emergency Stop, Safety Mat/Edge, Safety Switch/Interlock 3 - - 2 Preventa Automatic, Manual - Screw - Yes
RS庫存編號 156-083
製造零件編號750103
BrandPilz
HK$1,510.97
單位
24 V dc 2 - Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock 4 3 E 2 PNOZsigma Automatic, Manual, Monitored - Screw - Yes
RS庫存編號 240-8743
製造零件編號BD5987.02/001 AC50/60Hz 230V
BrandDold
HK$1,982.49
單位
230 V ac 2 - Emergency Stop 4 3 E 2 Safemaster - - - - -
RS庫存編號 477-3847
製造零件編號XPSAV11113
HK$2,800.00
單位
24 V 1, 2 - Emergency Stop 4 3 E 3 Preventa - - - - Yes