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

832 of 859
Siemens 3RF2 Series Solid State Relay, 70 A Load, Chassis Mount, 460 V ac Load, 30 Vdc Control
  • RS Stock No. 153-431
  • Mfr. Part No. 3RF2170-1BA04
Each
SGD104.51(exc. GST)
Phoenix Contact PCB Mount Power Relay, 120V ac Coil, 16A Switching Current, SPDT
  • RS Stock No. 801-8059
  • Mfr. Part No. 2961419
Each
SGD14.82(exc. GST)
TE Connectivity Panel Mount Power Relay, 12V dc Coil, 500mA Switching Current, SPDT
  • RS Stock No. 267-4945
  • Mfr. Part No. 5-1415899-4
Each (In a Box of 60)
SGD3.102(exc. GST)
Omron PCB Mount Signal Relay, 24V dc Coil, 1A Switching Current, DPDT
  • RS Stock No. 237-5356
  • Mfr. Part No. G5V-2-H1 DC24
Each
SGD4.78(exc. GST)
Omron H5FKB Series DIN Rail, Panel Mount Timer Relay, 100 → 240V ac, 1-Contact, SPST
  • RS Stock No. 841-1580
  • Mfr. Part No. H5F-KB
Each
SGD536.38(exc. GST)
Siemens Standstill Monitoring Relay, 3PDT, Snap-On Rail Mount
  • RS Stock No. 275-735
  • Mfr. Part No. 3TK2810-0BA01
Each
SGD1,899.30(exc. GST)
Omron PCB Mount Power Relay, 12V dc Coil, 16A Switching Current, SPST
  • RS Stock No. 686-7092P
  • Mfr. Part No. G2RL-1A4-E DC12
Each (Supplied in a Tube)
SGD6.12(exc. GST)
Omron PCB Mount Signal Relay, 3V dc Coil, 1A Switching Current, DPDT
  • RS Stock No. 683-9261
  • Mfr. Part No. G5V-2-H1 3DC
Each (In a Pack of 5)
SGD4.86(exc. GST)
Siemens DIN Rail Relay
  • RS Stock No. 275-1968
  • Mfr. Part No. 7PG2144-1CC40-1CE0
Each
SGD6,317.05(exc. GST)
Solid-state relay, 24 V DC
  • RS Stock No. 577-542
  • Mfr. Part No. 1990960000
Each
SGD54.89(exc. GST)
Eaton 262687 ETR2 Series Timer Relay, 240V ac, 1-Contact, 0.05 → 360000s
  • RS Stock No. 282-7117
  • Mfr. Part No. 262687 ETR2-21
Each
SGD201.53(exc. GST)
Finder PCB Mount Power Relay, 24V Coil, 30A Switching Current, DPDT
  • RS Stock No. 652-970
  • Mfr. Part No. 66.22.9.024.1000
Each
SGD32.75(exc. GST)
Sensata Crydom DRA1 CMX Series Solid State Interface Relay, 10 V dc Control, 5 A Load, DIN Rail Mount
  • RS Stock No. 701-8477
  • Mfr. Part No. DRA1-CMX60D5
Each
SGD119.16(exc. GST)
Siemens Current Monitoring Relay, 2 Phase, SPDT
  • RS Stock No. 256-5406
  • Mfr. Part No. 3RR21433AW30
Each
SGD379.46(exc. GST)
Panasonic Solid State Relay, 0.12 A Load, PCB Mount, 350 V Load, 5 V dc Control
  • RS Stock No. 699-6550
  • Mfr. Part No. AQW610EH
Each
SGD7.91(exc. GST)
Phoenix Contact EMG Series Solid State Relay, 2 A Load, Plug In, 30 V ac/dc Load, 6 V ac/dc Control
  • RS Stock No. 287-7884
  • Mfr. Part No. 2943259
Each (In a Pack of 10)
SGD198.829(exc. GST)
Better World
Schneider Electric Harmony Relay Series Solid State Relay, 45 A Load, DIN Rail Mount, 280 V ac/dc Load
  • RS Stock No. 256-4804
  • Mfr. Part No. SSD1A345M7C3
Each
SGD149.86(exc. GST)
TE Connectivity PCB Mount Force Guided Relay, 24V dc Coil Voltage, 4 Pole, 3PST, SPST
  • RS Stock No. 680-3571
  • Mfr. Part No. SR6M4024
Each
SGD39.04(exc. GST)
Tempatron Panel Mount Timer Relay, 90 → 250V ac, 2-Contact, 9 time ranges from 99.99 s → 9999h,
  • RS Stock No. 201-6979
  • Mfr. Part No. TF48MH
Each
SGD464.53(exc. GST)
Gefran GRS-H Series Solid State Relay, 40 A Load, DIN Rail Mount, 600 V ac Load, 32 V dc Control
  • RS Stock No. 601-970
  • Mfr. Part No. GRS-H-40-60-D-0-0-0-0
Each
SGD228.69(exc. GST)
1
832
859
Results per page

Related links