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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

    15801 Products showing for Relays & Signal Conditioning

    1 of 791
    RS PRO 8 Pin 300V DIN Rail Relay Socket, for use with RS PRO RUB Relays
    • RS Stock No. 121-7841
    Each
    HK$26.60
    Finder 94 Relay Socket for use with Various Series
    • RS Stock No. 776-1645
    • Mfr. Part No. 94.740SMA
    Each
    HK$73.00
    Celduc SO9 Series Solid State Relay, 50 A Load, Panel Mount, 600 V rms Load, 32 V Control
    • RS Stock No. 499-0496
    • Mfr. Part No. SO965460
    Each
    HK$405.40
    Finder PCB Mount Power Relay, 24V dc Coil, 16A Switching Current, SPST
    • RS Stock No. 494-6360
    • Mfr. Part No. 45.71.7.024.0310
    Each
    HK$45.00
    Better World
    Schneider Electric DIN Rail Power Relay, 110 V dc, 230 → 240V ac Coil, 16A Switching Current, SPDT
    • RS Stock No. 244-0078
    • Mfr. Part No. GF1611U7
    Each
    HK$424.20
    Releco Plug In Power Relay, 115V ac Coil, 10A Switching Current, 3PDT
    • RS Stock No. 345-993
    • Mfr. Part No. C3-A30X / AC 115 V
    Each
    HK$293.90
    Phoenix Contact 3RS7003 Series Signal Conditioner, Current, Voltage Input, Current Output, 24V dc Supply, ATEX
    • RS Stock No. 489-2881
    • Mfr. Part No. 2864176
    Each
    HK$3,069.40
    Phoenix Contact PCB Mount Power Relay, 24V dc Coil, 6A Switching Current, SPDT
    • RS Stock No. 358-8288
    • Mfr. Part No. 2961121
    Each
    HK$146.20
    Finder 83 Series Series DIN Rail Mount Timer Relay, 24 → 240V ac/dc, 1-Contact, 0.05-10 s, 0.05-10 d, 0.05-10
    • RS Stock No. 759-6634
    • Mfr. Part No. 83.01.0.240.0000
    Each
    HK$529.20
    Finder 95 250V ac Relay Socket, for use with 40.52, 40.61, 44.52, 44.62, 40.51 Series Relay
    • RS Stock No. 272-3137
    • Mfr. Part No. 95.75SMA
    Each
    HK$50.40
    GIC Voltage Monitoring Relay, 1, 3 Phase, DPDT, DIN Rail
    • RS Stock No. 794-3948
    • Mfr. Part No. MG73BH
    Each
    HK$640.80
    Fujitsu PCB Mount Power Relay, 12V dc Coil, 5A Switching Current, SPST
    • RS Stock No. 790-3322
    • Mfr. Part No. FTR-F3AA012E-HA
    Each
    HK$9.90
    Celduc SO8 Series Solid State Relay, 75 A Load, Panel Mount, 510 V rms Load, 32 V Control
    • RS Stock No. 499-0654
    • Mfr. Part No. SO867070
    Each
    HK$486.80
    Omron PCB Mount Power Relay, 120V ac Coil, 5A Switching Current, SPDT
    • RS Stock No. 807-4478
    • Mfr. Part No. G2R-14-AC120
    Each
    HK$58.70
    Siemens 3RF2 Series Solid State Relay, 30 A Load, DIN Rail Mount, 230 V Load
    • RS Stock No. 203-2148
    • Mfr. Part No. 3RF2130-1AA42
    Each
    HK$423.20
    Panasonic PCB Mount Power Relay, 5V dc Coil, 5A Switching Current, SPST
    • RS Stock No. 134-7945
    • Mfr. Part No. APAN3105
    Each
    HK$32.00
    Better World
    Schneider Electric Phase, Voltage Monitoring Relay, 1, 3 Phase, DIN Rail
    • RS Stock No. 204-8285
    • Mfr. Part No. TPRVM001
    Each
    HK$1,948.30
    Omron Panel Adapter for G3PA-240B SSR, G32A-A40-VD DC5-24
    • RS Stock No. 376-076
    • Mfr. Part No. G32A-A40-VD DC5-24
    Each
    HK$837.60
    Siemens SIRIUS 3RQ3 Output Coupler with Plug-In Series Relay, Snap-On Rail Mount, 24V ac/dc Coil
    • RS Stock No. 175-2341
    • Mfr. Part No. 3RQ3118-2AB00
    Each
    HK$234.10
    Siemens SIRIUS 3RQ3 Output Coupler Series Relay, Snap-On Rail Mount, 24V ac/dc Coil
    • RS Stock No. 175-2302
    • Mfr. Part No. 3RQ3018-2AB00
    Each
    HK$315.50
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