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    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.

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    Signal Conditioners & Isolators
    Signal Conditioners & Isolators

    15641 Products showing for Relays & Signal Conditioning

    1 of 783
    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
    SGD420.19
    RS PRO DIN Rail Mount Timer Relay, 12 → 230V ac/dc, 0.1 s → 100h, SPDT
    • RS Stock No. 102-6127
    Each
    SGD37.65
    Finder PCB Mount Power Relay, 110V ac Coil, 7A Switching Current, 4PDT
    • RS Stock No. 245-2295
    • Mfr. Part No. 55.14.8.110.0000
    Each
    SGD25.43
    Weidmuller TRZ Series Interface Relay, DIN Rail Mount, 24V Coil, DPDT, 2-Pole
    • RS Stock No. 892-8864
    • Mfr. Part No. 1123610000
    Each
    SGD27.01
    Better World
    Schneider Electric Harmony Time Series DIN Rail Mount Timer Relay, 24 → 240V ac/dc, 1-Contact, 0.3 →
    • RS Stock No. 896-8695
    • Mfr. Part No. RE22R1KMR
    Each
    SGD136.32
    Omron G3NA Series Solid State Relay, 10 A Load, DIN Rail Mount, 240 V ac Load
    • RS Stock No. 794-8277
    • Mfr. Part No. G3NA-210B-UTU DC5-24
    Each
    SGD51.46
    Phoenix Contact PLC-BSC 24V dc Relay Socket
    • RS Stock No. 251-9455
    • Mfr. Part No. 2966016
    Each
    SGD18.54
    Murrelektronik Limited Interface Relay, DIN Rail Mount, 24V dc Coil, SPDT, 1-Pole, 6A Load
    • RS Stock No. 137-0297
    • Mfr. Part No. 51120
    Each
    SGD39.27
    Hongfa Europe GMBH 5 Pin 250V ac DIN Rail Relay Socket, for use with HF41F Series Relays
    • RS Stock No. 923-2613
    • Mfr. Part No. 41F-1Z-C1-1
    Each
    SGD15.59
    Carlo Gavazzi RP1 Series Solid State Relay, 3 A Load, PCB Mount, 230 V ac Load, 32 Vdc Control
    • RS Stock No. 272-6006
    • Mfr. Part No. RP1B23D3
    Each
    SGD22.56
    Finder 4C Series Interface Relay, DIN Rail Mount, 24V dc Coil, DPDT, 2-Pole
    • RS Stock No. 154-362
    • Mfr. Part No. 4C.02.9.024.0050SPA
    Each
    SGD31.13
    Sensata Crydom DRA1-MP Series Solid State Interface Relay, 32 V dc Control, 3 A Load, DIN Rail Mount
    • RS Stock No. 701-8623
    • Mfr. Part No. DRA1-MPDCD3
    Each
    SGD102.26
    Panasonic Plug In Automotive Relay, 24V dc Coil Voltage, 15A Switching Current, SPDT
    • RS Stock No. 699-5976
    • Mfr. Part No. CM124
    Each
    SGD20.67
    PR Electronics Signal Conditioner
    • RS Stock No. 796-7039
    • Mfr. Part No. 4590
    Each
    SGD388.32
    RS PRO Plug In Power Relay, 24V dc Coil, 5A Switching Current, 4PDT
    • RS Stock No. 121-7796
    Each
    SGD12.34
    Low Signal Relay, PCB, DPDT-NO, 12VDC 2A
    • RS Stock No. 206-6112
    • Mfr. Part No. V23079A2003B301 3-1393789-7
    Each
    SGD3.50
    Phoenix Contact PCB Mount Power Relay, 24V dc Coil, 6A Switching Current, SPDT
    • RS Stock No. 290-1416
    • Mfr. Part No. 2961105
    Each
    SGD24.36
    Schneider Electric Copper Terminal Lug for Panel Mounting Solid State Relay SSP1, SSRAL1
    • RS Stock No. 922-2101
    • Mfr. Part No. SSRAL1
    Each
    SGD81.16
    Omron G9SE Emergency Stop Safety Relay, 24V dc, Dual-Channel, 4 Safety Contacts
    • RS Stock No. 890-3382
    • Mfr. Part No. G9SE-401 DC24
    Each
    SGD268.41
    Panasonic Surface Mount Signal Relay, 24V dc Coil, 2A Switching Current, DPDT
    • RS Stock No. 815-4928
    • Mfr. Part No. TX2-24V
    Each
    SGD4.01
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