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

17174 Products showing for Relays & Signal Conditioning

47 of 859
In Stock
PR Electronics 4 Series Signal Conditioner, Universal Input, Frequency Output, 19.2 → 300 V dc, 21.6 →
  • RS Stock No. 827-5511
  • Mfr. Part No. 4222
Each
SGD674.06(exc. GST)
In Stock
Sensata Crydom LN Series Solid State Relay, 25 A Load, Panel Mount, 528 V ac Load
  • RS Stock No. 227-0919
  • Mfr. Part No. LND4425
Each
SGD131.58(exc. GST)
In Stock
ABB Temperature Monitoring Relay, DPDT, DIN Rail
  • RS Stock No. 876-5045
  • Mfr. Part No. 1SVR730712R1200 CM-MSS.41S
Each
SGD208.83(exc. GST)
In Stock
PR Electronics 4100 Series Universal Transmitter, Universal Input, Relay Output, 19.2 → 300 V dc, 21.6 →
  • RS Stock No. 796-6913
  • Mfr. Part No. 4131
Each
SGD380.46(exc. GST)
In Stock
Sensata Crydom ED Series Solid State Relay, 5 A Load, DIN Rail Mount, 48 V dc Load, 15 V dc Control
  • RS Stock No. 740-1306
  • Mfr. Part No. ED06D5
Each
SGD33.62(exc. GST)
In Stock
TE Connectivity RT Series Interface Relay, DIN Rail Mount, 24V dc Coil, SPDT, 1-Pole
  • RS Stock No. 494-0520
  • Mfr. Part No. RT3S4LC4 4-1415073-1
Each
SGD19.36(exc. GST)
In Stock
Sensata Crydom Solid State Relay, 50 A rms Load, Panel Mount, 530 V rms Load, 32 V Control
  • RS Stock No. 184-5999
  • Mfr. Part No. D53TP50D
Each
SGD267.89(exc. GST)
In Stock
Sensata Crydom DC60 Series Solid State Relay, 7 A Load, Surface Mount, 60 V dc Load, 32 V dc Control
  • RS Stock No. 736-0882
  • Mfr. Part No. DC60S7-B
Each
SGD86.25(exc. GST)
Currently unavailable
Schneider Electric Dual-Channel Emergency Stop, Light Beam/Curtain, Safety Switch/Interlock Safety Relay, 24V ac/dc, 3
  • RS Stock No. 814-6921
  • Mfr. Part No. XPSAFL5130P
Each
SGD441.73(exc. GST)
In Stock
Carlo Gavazzi Phase Monitoring Relay, 3 Phase, SPDT, 177 → 550V ac, DIN Rail
  • RS Stock No. 857-7662
  • Mfr. Part No. DPA51CM44
Each
SGD192.27(exc. GST)
In Stock
Celduc SO9 Series Solid State Relay, 50 A Load, Panel Mount, 600 V rms Load, 32 V Control
  • RS Stock No. 499-0496
  • Mfr. Part No. SO965460
Each
SGD86.27(exc. GST)
In Stock
RS PRO DIN Rail Mount Timer Relay, 12 → 240V ac, 2-Contact, 0.1s to 100h, DPDT
  • RS Stock No. 225-7036
Each
SGD105.09(exc. GST)
In Stock
RS PRO Plug In Power Relay, 24V dc Coil, 10A Switching Current, DPDT
  • RS Stock No. 450-0425
Each
SGD13.71(exc. GST)
In Stock
Carlo Gavazzi RMI Series Solid State Relay, 5 A Load, Plug-In Mount, 30 V dc Load, 24 V dc Control
  • RS Stock No. 859-3263
  • Mfr. Part No. RMIA4524VDC
Each
SGD12.33(exc. GST)
In Stock
RS PRO SPNO Reed Relay, 24V dc Coil, 7.845 kΩ, PCB Mount
  • RS Stock No. 291-9732
Each
SGD45.21(exc. GST)
In Stock
Phoenix Contact MACX MCR-PTB-SP Series Signal Conditioner, Voltage Input, Relay Output, ATEX
  • RS Stock No. 207-3415
  • Mfr. Part No. 2924184
Each
SGD199.74(exc. GST)
Last RS stock
Siemens Voltage Monitoring Relay, 1 Phase, SPDT, 17 → 275V ac/dc, DIN Rail
  • RS Stock No. 758-6946
  • Mfr. Part No. 3UG4633-1AL30
Each
SGD415.53(exc. GST)
In Stock
Omron PCB Mount Power Relay, 12V dc Coil, 16A Switching Current, SPST
  • RS Stock No. 683-8719
  • Mfr. Part No. G2R-1A-E DC12
Each
SGD6.97(exc. GST)
Temporarily out of stock
Finder Plug In Relay, 6V ac Coil, 7A Switching Current
  • RS Stock No. 248-1600
  • Mfr. Part No. 553480060040
Each (In a Pack of 10)
SGD24.219(exc. GST)
In Stock
Sensata Crydom DRA1-CX Series Solid State Interface Relay, 32 V dc Control, 5 A rms Load, DIN Rail Mount
  • RS Stock No. 701-8547
  • Mfr. Part No. DRA1-CXE240D5
Each
SGD88.00(exc. GST)
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