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

17728 Products showing for Relays & Signal Conditioning

4 of 887
RS PRO Plug In Power Relay, 24V dc Coil, 10A Switching Current, DPDT
  • RS stock no. 121-7811
Each
R 192.19(exc. VAT)
Better World
Schneider Electric Harmony Relay RXM Series Interface Relay, DIN Rail Mount, 230V ac Coil, 4PDT, 4-Pole, 6A Load
  • RS stock no. 203-5228
  • Mfr. Part No. RXM4AB2P7PVM
Each
R 656.48(exc. VAT)
Hongfa Europe GMBH PCB Mount Power Relay, 12V dc Coil, 10A Switching Current, SPST
  • RS stock no. 176-2886
  • Mfr. Part No. HF33F/012-HSL3F
Each (In a Pack of 5)
R 30.756(exc. VAT)
Allen Bradley 440R / MSR127TP 1 Auxiliary Contacts Safety Relay 24V ac/dc, Single Channel 3 Safety Contacts
  • RS stock no. 447-5688
  • Mfr. Part No. 440R-N23132
Each
R 5,269.41(exc. VAT)
Weidmuller ACT20X Series Signal Conditioner, RTD Input, Current Output, 9 → 30V dc Supply
  • RS stock no. 393-0184
  • Mfr. Part No. 8473010000
Each
R 1,750.45(exc. VAT)
Omron H3Y Series DIN Rail, Surface Mount Timer Relay, 200 → 230V ac, 4-Contact, 2 → 60s, 1-Function, 4PDT
  • RS stock no. 340-623
  • Mfr. Part No. H3Y-4 AC200-230 60S
Each
R 1,285.05(exc. VAT)
RS PRO Voltage Monitoring Relay, Three Phase, 1NO/1NC, 230 → 460V ac, DIN Rail or Panel
  • RS stock no. 434-520
Each
R 745.94(exc. VAT)
Better World
Schneider Electric Harmony Time Series DIN Rail Mount Timer Relay, 24 → 240V ac, 0.1 s → 100h, Solid State
  • RS stock no. 791-2717
  • Mfr. Part No. RE17LMBM
Each
R 1,691.87(exc. VAT)
Carlo Gavazzi DIN Rail Mount Timer Relay, 24 → 240 V ac, 24V dc, 2-Contact, 0.1 s → 100h, SPDT
  • RS stock no. 857-7139
  • Mfr. Part No. DMB51CM24
Each
R 1,210.62(exc. VAT)
RS PRO Panel Mount Timer Relay, 100 → 125 V dc, 100 → 240V ac, 2-Contact, 0.1 s → 300h, DPDT
  • RS stock no. 179-2915
Each
R 1,752.23(exc. VAT)
Omron Plug In Power Relay, 24V dc Coil, 10A Switching Current, SPDT
  • RS stock no. 329-7229
  • Mfr. Part No. G2R-1-SNDI DC24(S)
Each
R 237.94(exc. VAT)
Eaton DIN Rail Mount Timer Relay, 24 → 240V ac/dc, 2-Contact, 3 → 60s, 1-Function, SPST
  • RS stock no. 225-8295
  • Mfr. Part No. 031884 ETR4-51-A
Each
R 3,011.21(exc. VAT)
Crouzet Current Monitoring Relay, SP-NO/NC, DIN Rail
  • RS stock no. 261-959
  • Mfr. Part No. 84871122
Each
R 2,969.02(exc. VAT)
Solartron Metrology Signal Conditioner, Voltage Input, Current, Voltage Output, 10 → 30V dc Supply
  • RS stock no. 775-3893
  • Mfr. Part No. 911442
Each
R 10,910.28(exc. VAT)
Omron Plug In Non-Latching Relay, 21V dc Coil, 6A Switching Current, SPDT
  • RS stock no. 230-5174
  • Mfr. Part No. G2RV-1-S-G DC21
Each
R 262.92(exc. VAT)
RS PRO Interface Relay, DIN Rail Mount, 12V ac/dc Coil, SPDT, 1-Pole, 6A Load
  • RS stock no. 282-4466
Each
R 355.12(exc. VAT)
Pilz PNOZsigma PNOZ s7 C Safety Relay 24V dc
  • RS stock no. 268-7568
  • Mfr. Part No. 751107
Each
R 3,491.08(exc. VAT)
Omron Plug In Power Relay, 24V dc Coil, 10A Switching Current, DPDT
  • RS stock no. 548-4245
  • Mfr. Part No. MY2IN DC24(S)
Each
R 197.81(exc. VAT)
Schneider Electric Harmony Relay RXG Series Interface Relay, DIN Rail Mount, 24V dc Coil, DPDT, 5A Load
  • RS stock no. 203-5194
  • Mfr. Part No. RXG22BDPV
Each
R 529.94(exc. VAT)
Panasonic Plug In Automotive Relay, 12V dc Coil Voltage, 70A Switching Current, SPST
  • RS stock no. 811-3097
  • Mfr. Part No. CB1AH-12V
Each
R 197.19(exc. VAT)
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