Relays & Signal Conditioning

We stock a large choice of relay 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 from trusted brands 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 is operated electronically to turn on or off current within an electric circuit. Relays operate similar to a typical light switch, where power is switched on and off when the switch lever is moved, the main difference is that 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 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 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's feature semiconductor switching elements, typically thyristors, triacs and diodes that transmits and energises 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.
Relay Accessories
Relay Accessories
Relays
Relays
Signal Conditioners & Isolators
Signal Conditioners & Isolators

18567 Products showing for Relays & Signal Conditioning

39 of 929
Hengstler H-468 HDZ-43468 Safety Relay 24V dc, Single Channel
  • RS Stock No. 280-4436
  • Mfr. Part No. 468-1003
Each
£40.46(exc. VAT)
Better World
Schneider Electric Harmony XPS/ Preventa XPS XPSU 8 Auxiliary Contacts Safety Relay 24V ac/dc, Single Channel 2 Safety
  • RS Stock No. 201-1471
  • Mfr. Part No. XPSUAB11CC
Each
£136.92(exc. VAT)
Eaton 2 Channel Zener Barrier, Switch/Proximity Detector Interface, NAMUR Sensor, Switch Input, Relay Output, ATEX
  • RS Stock No. 703-7040
  • Mfr. Part No. MTL5516C/RS
Each
£265.53(exc. VAT)
Sensata Crydom HD60 Series Solid State Relay, 50 A Load, Panel Mount, 660 V ac Load, 32 V Control
  • RS Stock No. 291-2242
  • Mfr. Part No. HD6050
Each
£69.24(exc. VAT)
Better World
Schneider Electric Harmony Time Series DIN Rail Mount Timer Relay, 24 → 240V ac/dc, 2-Contact, 0.05 → 1s,
  • RS Stock No. 897-6700
  • Mfr. Part No. RE22R2ACMR
Each
£88.54(exc. VAT)
Tempatron DIN Rail Relay Socket, for use with 11 Pin Relay, 11 Pin Timer, Octal Relay, Octal Timer
  • RS Stock No. 403-869
  • Mfr. Part No. CDSR11
Each
£8.93(exc. VAT)
Siemens 3RP25 Series DIN Rail Mount Timer Relay, 12 → 240V ac/dc, 2-Contact, 3 → 60s, 1-Function, DPST
  • RS Stock No. 831-6075
  • Mfr. Part No. 3RP2576-1NW30
Each
£70.96(exc. VAT)
Omron EF7616. Series DIN Rail Mount Timer Relay, 24 → 230 V ac, 24 → 48V dc, 1-Contact, 0.1 s →
  • RS Stock No. 365-6987
  • Mfr. Part No. H3DS-ML AC/DC
Each
£52.95(exc. VAT)
Eurotherm Solid State Relay, 16 A Load, DIN Rail Mount, 240 V Load, 32 V dc Control
  • RS Stock No. 906-0903
  • Mfr. Part No. ESWITCH/16A/240V/LGC/ENG/-/MSFUSE/-/-
Each
£191.65(exc. VAT)
Lovato DIN Rail Mount Timer Relay, 12 → 240V ac/dc, 2-Contact, 0.1 s → 10days, SPDT
  • RS Stock No. 905-3466
  • Mfr. Part No. TMM1
Each
£83.59(exc. VAT)
PR Electronics 5000 Series Signal Conditioner, Frequency Input, Current, Voltage, Relay Output, 19.2 → 28.8V dc
  • RS Stock No. 796-6982
  • Mfr. Part No. 5225A1
Each
£309.97(exc. VAT)
Finder 84 Series Series DIN Rail Mount Timer Relay, 110 → 240V ac/dc, 2-Contact, 0.1 s → 9999h, DPDT
  • RS Stock No. 123-2801
  • Mfr. Part No. 84.02.0.230.0000
Each
£152.50(exc. VAT)
Celduc SP-ST-SL Series Solid State Relay, 5 A Load, PCB Mount, 30 V dc Load, 30 V dc Control
  • RS Stock No. 776-7680
  • Mfr. Part No. SPD03505
Each
£28.65(exc. VAT)
Omron PCB Mount Power Relay, 24V dc Coil, 8A Switching Current, SPDT
  • RS Stock No. 237-5378
  • Mfr. Part No. G6RN-1 DC24
Each
£2.23(exc. VAT)
Carlo Gavazzi DIN Rail Mount Timer Relay, 12 → 240V ac/dc, 2-Contact, 0.1 s → 100h, SPDT
  • RS Stock No. 857-7539
  • Mfr. Part No. DMB51CW24
Each
£56.91(exc. VAT)
Better World
Schneider Electric Harmony Relay Series Solid State Relay, 25 A Load, Panel Mount, 530 V ac Load, 32 V dc Control
  • RS Stock No. 922-2013
  • Mfr. Part No. SSP3A225BD
Each
£161.46(exc. VAT)
Finder Pluggable Function Module, Timer Module
  • RS Stock No. 454-7137
  • Mfr. Part No. 86.00.0.240.0000
Each
£56.74(exc. VAT)
Releco CT3-E Series Plug In Timer Relay, 20 → 65V ac/dc, 0.2 → 30 min, 0.2 → 30s, 1-Function
  • RS Stock No. 459-4357
  • Mfr. Part No. CT3-E30 / L
Each
£87.24(exc. VAT)
Omron H3YN Series DIN Rail, Panel Mount Timer Relay, 24V ac, 4-Contact, 0.1 s → 10min
  • RS Stock No. 236-1391
  • Mfr. Part No. H3YN-4 AC24
Each
£51.50(exc. VAT)
RS PRO Plug In Power Relay, 12V dc Coil, 10A Switching Current, DPDT
  • RS Stock No. 450-0318
Each
£8.02(exc. VAT)
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Guides & Articles

Article image
Solid State Relays Guide
This complete guide looks at what solid state relays are, how they work, the various circuits and the different types that are currently available.
Read more
Article image
Latching Relays Guide
In our comprehensive guide we look at what latching relays are, what types and sizes are available, as well as the different uses of latching relays.
Read more

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