Relays & Signal Conditioning

At RS, we stock a large choice of relay switch products for a wide variety of applications. Within our range, you will find products such as latching and non-latching relays, solid state relays, interface relays and reed relays. All our relay switch products are from trusted electrical relay suppliers such as our own RS PRO brand, Omron, Finder, TE Connectivity, Panasonic, Phoenix Contact and more.

What is a relay?

Relays are a type of switch that operate electronically to turn AC or DC currents on or off within an electrical circuit. Relays operate similar to a typical light switch, where power is switched on and off when the switch lever is moved, but the main difference lies in how a relay is operated by an electrical circuit rather than manually pressed.

Relays have many different uses and are often utilised in situations where isolation is necessary or when a circuit needs to be controlled with a low-power signal. There are also specialised types of relay switches that are used for very high-power applications; these are referred to as contactors.

Types of relay

Electromechanical Relay (EMR): An electromechanical relay uses a physical moving arm, triggered by a voltage applied to the relay coil, this arm connects contacts within the output component of the relay. The movement of the arm allows an electrical circuit to be completed, allowing AC or DC current to flow to the connected equipment. The physical components within the relays commonly make a "click" sound, which can be used as an audible operation indicator.

Solid State Relay (SSR): Solid state relays provide a similar function to an EMR but these do not contain any moving components, increasing long-term reliability. SSR' feature semiconductor switching elements; typically thyristors, triacs and diodes that transmit and energise the output signal. When activated, the input signal acts like a switch that allows a high-voltage signal to pass through the SSRs output components.

Shop relays, relay accessories, and signal conditioners isolators at RS today.

Relay Accessories
Relay Accessories
Relays
Relays
Signal Conditioners & Isolators
Signal Conditioners & Isolators

17106 Products showing for Relays & Signal Conditioning

1 of 856
Better World
Schneider Electric Frequency, Phase, Voltage Monitoring Relay, 3 Phase, DPDT, DIN Rail
  • RS Stock No. 179-0019
  • Mfr. Part No. RMNF22TB30
Each
HK$1,394.80(exc. GST)
Hongfa Europe GMBH PCB Mount Power Relay, 12V dc Coil, 30A Switching Current, SPST
  • RS Stock No. 176-2807
  • Mfr. Part No. HF165FD/12-HY1TF
Each (In a Pack of 2)
HK$37.80(exc. GST)
Finder DIN Rail Power Relay, 12V dc Coil, 20A Switching Current, SPST-NC, SPST-NO
  • RS Stock No. 511-1177
  • Mfr. Part No. 22.23.9.012.4000
Each
HK$283.20(exc. GST)
Panasonic PCB Mount Power Relay, 24V dc Coil, 5A Switching Current, SPST
  • RS Stock No. 811-3173
  • Mfr. Part No. DSP1A-DC24V
Each
HK$37.80(exc. GST)
Banner GM 1 Auxiliary Contacts Safety Relay 24V ac Dual, Single 2 Safety Contacts
  • RS Stock No. 285-925
  • Mfr. Part No. GM-FA-10J
Each
HK$3,684.01(exc. GST)
Phoenix Contact RIF-0-RPT-24DC/ 1AU Series Interface Relay, DIN Rail Mount, 24V dc Coil, SPST, 1-Pole
  • RS Stock No. 794-3759
  • Mfr. Part No. 2903359
Each
HK$66.60(exc. GST)
TE Connectivity PCB Mount Power Relay, 12V dc Coil, 12A Switching Current, SPDT
  • RS Stock No. 718-1718
  • Mfr. Part No. 1-1415899-0
Each
HK$18.00(exc. GST)
RS PRO Voltage Monitoring Relay, 3 Phase, DPDT, DIN Rail
  • RS Stock No. 223-7790
Each
HK$1,249.32(exc. GST)
Siemens SIRIUS 3SK1 Safety Relay 24V ac/dc, Single Channel 4 Safety Contacts
  • RS Stock No. 784-5780
  • Mfr. Part No. 3SK1111-1AB30
Each
HK$3,377.40(exc. GST)
Finder PCB Mount Power Relay Module, 110V dc Coil, 20A Switching Current
  • RS Stock No. 248-2079
  • Mfr. Part No. 564491100000
Each (In a Pack of 10)
HK$233.918(exc. GST)
Weidmuller TRZ Series Interface Relay, DIN Rail Mount, 24 → 230V ac/dc Coil, SPDT, 1-Pole, 6A Load
  • RS Stock No. 892-8861
  • Mfr. Part No. 1122970000
Each
HK$206.20(exc. GST)
Sensata Crydom HS Series DIN Rail Relay Heatsink for Use with 1 x single or dual SSR
  • RS Stock No. 703-4561
  • Mfr. Part No. HS501DR
Each
HK$166.00(exc. GST)
Pilz PNOZsigma PNOZ s5 Safety Relay 48 → 240V ac/dc, Dual-Channel 2 Safety Contacts
  • RS Stock No. 155-838
  • Mfr. Part No. 750135
Each
HK$3,584.60(exc. GST)
RS PRO DIN Rail Mount Timer Relay, 12 → 240V ac/dc, 1-Contact, 0.1 s → 100h, SPDT
  • RS Stock No. 896-6826
Each
HK$342.70(exc. GST)
Finder PCB Mount Relay, 24V dc Coil, 8A Switching Current
  • RS Stock No. 249-4437
  • Mfr. Part No. 40.52.9.024.4000
Each
HK$70.00(exc. GST)
Omron Plug In Latching Power Relay, 24V dc Coil, DPDT
  • RS Stock No. 818-4260
  • Mfr. Part No. MY2IN1 24VDC (S)
Each
HK$75.80(exc. GST)
Omron PCB Mount Power Relay, 12V dc Coil, 8A Switching Current, SPST
  • RS Stock No. 807-3955
  • Mfr. Part No. G6C-2114P-US-DC12
Each
HK$52.10(exc. GST)
Finder PCB Mount Power Relay, 12V dc Coil, 8A Switching Current, DPDT
  • RS Stock No. 351-572
  • Mfr. Part No. 40.52.7.012.0000
Each
HK$49.30(exc. GST)
Omron G2R 8 Pin 250V ac DIN Rail Relay Socket, for use with G2R-2-S Series
  • RS Stock No. 794-8211
  • Mfr. Part No. P2RF-08-S
Each
HK$91.60(exc. GST)
Sensata Crydom Solid State Relay, 50 A Load, Panel Mount, 660 V ac Load, 32 V Control
  • RS Stock No. 291-2359
  • Mfr. Part No. H12WD4850
Each
HK$636.70(exc. GST)
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