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

58 of 859
In Stock
Finder PCB Mount Relay, 230V ac Coil, 8A Switching Current
  • RS Stock No. 249-4434
  • Mfr. Part No. 40.52.8.230.4000
Each
SGD21.57(exc. GST)
In Stock
Broyce Control Voltage Monitoring Relay, 2 x SPNO, DIN Rail
  • RS Stock No. 188-3545
  • Mfr. Part No. LR44/2 100-230V AC/DC
Each
SGD55.87(exc. GST)
In Stock
Sensata Crydom CW24 Series Solid State Relay, 25 A rms Load, Panel Mount, 280 V rms Load, 32 V Control
  • RS Stock No. 491-4852
  • Mfr. Part No. CWD2425
Each
SGD83.27(exc. GST)
In Stock
Panasonic Plug In Automotive Relay, 24V dc Coil Voltage, 20A Switching Current, SPST
  • RS Stock No. 699-5941
  • Mfr. Part No. CB1AH24
Each
SGD14.80(exc. GST)
Temporarily out of stock
Siemens 3RS7020 Series Signal Conditioner, Current Input, Current Output
  • RS Stock No. 134-8056
  • Mfr. Part No. 3RS7020-1ET00
Each
SGD414.21(exc. GST)
In Stock
Turck 2 Channel Galvanic Barrier, Analogue Input Isolator, Current, Voltage Input, Current Output, ATEX, IECEx
  • RS Stock No. 808-6548
  • Mfr. Part No. IM31-22EX-I
Each
SGD637.34(exc. GST)
In Stock
Eaton Phase, Voltage Monitoring Relay, 3 Phase, 300 → 500V ac, DIN Rail
  • RS Stock No. 179-3530
  • Mfr. Part No. 184764 EMR6-AW500-D-1
Each
SGD432.80(exc. GST)
In Stock
Schneider Electric Earth Leakage Relay, 50/60Hz Frequency, 300mA Leakage
  • RS Stock No. 276-8741
  • Mfr. Part No. A9V35363
Each
SGD949.12(exc. GST)
In Stock
RS PRO Interface Relay, DIN Rail Mount, 230V ac/dc Coil, SPDT, 1-Pole
  • RS Stock No. 888-6837
Each (In a Pack of 5)
SGD22.422(exc. GST)
In Stock
TE Connectivity PCB Mount Monostable Relay, 24V dc Coil, 16A Switching Current, SPDT
  • RS Stock No. 240-8971
  • Mfr. Part No. 5-1415899-5
Each
SGD3.26(exc. GST)
Temporarily out of stock
Omron PCB Mount Signal Relay, 48V dc Coil, 2A Switching Current, DPDT
  • RS Stock No. 368-3888
  • Mfr. Part No. G6A-234P-ST-US DC48
Each
SGD13.60(exc. GST)
In Stock
Dold Current Monitoring Relay, DPDT, DIN Rail
  • RS Stock No. 445-9046
  • Mfr. Part No. IL5882.38 AC/DC24V-230V Tv=5S
Each
SGD511.15(exc. GST)
In Stock
Finder 95 8 Pin 250V ac DIN Rail Relay Socket, for use with 40.52, 40.61, 44.52, 44.62, 40.51 Series Relay
  • RS Stock No. 776-1642
  • Mfr. Part No. 95.85.3SMA
Each
SGD10.71(exc. GST)
In Stock
Omron G3NA Series Solid State Relay, 20 A Load, Surface Mount, 240 V ac Load
  • RS Stock No. 266-2741
  • Mfr. Part No. G3NA-220B-UTU DC5-24
Each
SGD63.20(exc. GST)
In Stock
Better World
Schneider Electric Plug In Power Relay, 240V ac Coil, 3A Switching Current, 4PDT
  • RS Stock No. 884-1641
  • Mfr. Part No. RXM4GB2U7
Each
SGD17.70(exc. GST)
In Stock
Finder 83 Series Series DIN Rail Mount Timer Relay, 24 → 240V ac/dc, 1-Contact, 0.05-10 min, 0.05-10 h, 0.05-10
  • RS Stock No. 759-6640
  • Mfr. Part No. 83.21.0.240.0000
Each
SGD86.96(exc. GST)
In Stock
Broyce Control Phase, Voltage Monitoring Relay, 3 Phase, SPDT, 280 → 520V ac, DIN Rail
  • RS Stock No. 850-5370
  • Mfr. Part No. LXPRT 280-520VAC
Each
SGD173.96(exc. GST)
Temporarily out of stock
Better World
Schneider Electric Monitoring Relay
  • RS Stock No. 211-8364
  • Mfr. Part No. IMD-IM400
Each
SGD11,113.88(exc. GST)
In Stock
Phoenix Contact PSRclassic PSR-SCP 1 Auxiliary Contacts Safety Relay 24V ac/dc, Single/Dual-Channel 8 Safety Contacts
  • RS Stock No. 666-7038
  • Mfr. Part No. 2963912
Each
SGD851.46(exc. GST)
In Stock
ABB Phase, Voltage Monitoring Relay, 3 Phase, DPDT, 180 → 280V ac, DIN Rail
  • RS Stock No. 775-7918
  • Mfr. Part No. 1SVR730885R3300 CM-MPS.21S
Each
SGD403.78(exc. GST)
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