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
Relays
Signal Conditioners & Isolators

18553 Products showing for Relays & Signal Conditioning

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In Stock
Omron H3CR Series DIN Rail, Panel Mount Timer Relay, 2-Contact, 125 V dc 100V ac, 240 V ac, 0.05 s → 300 h,
  • RS Stock No. 113-8134
  • Mfr. Part No. H3CR-A 100-240VAC/100-125VDC
Subtotal (1 unit)
HK$1,207.00
HK$1,207.00/unit
In Stock
Durakool PCB Automotive Relay, 12V Coil Voltage, 30A Switching Current, SPNO
  • RS Stock No. 915-6626
  • Mfr. Part No. DG20-7021-35-1012/2
Subtotal (1 unit)
HK$12.20
HK$12.20/unit
In Stock
Omron G7SA, 24V dc Safety Relay
  • RS Stock No. 836-2738
  • Mfr. Part No. G7SA-5A1B DC24
Subtotal (1 unit)
HK$338.40
HK$338.40/unit
In Stock
Omron P2RF 5 Way 250V ac DIN Rail Relay Socket, for use with G2R Relay
  • RS Stock No. 815-6744
  • Mfr. Part No. P2RF-05-ESS
Subtotal (1 unit)
HK$72.00
HK$72.00/unit
In Stock
Phoenix Contact PLC-BSC 24 V ac, 24V dc DIN Rail Relay Base
  • RS Stock No. 742-7461
  • Mfr. Part No. 2966029
Subtotal (1 unit)
HK$146.20
HK$146.20/unit
In Stock
RS PRO DIN Rail Timer Relay, 1-Contact, 24 V dc 12V ac, 240 V ac, 0.1 s → 100 h, Multifunction-Function, SPDT
  • RS Stock No. 896-6826
Subtotal (1 unit)
HK$477.60
HK$477.60/unit
In Stock
Panasonic PCB Power Relay, 24V dc Coil, 5A Switching Current, SPST
  • RS Stock No. 811-3173
  • Mfr. Part No. DSP1A24D
Subtotal (1 unit)
HK$44.70
HK$44.70/unit
In Stock
Weidmüller ACT20X Series Signal Conditioner, RTD Input, Current Output, 30V Supply
  • RS Stock No. 393-0235
  • Mfr. Part No. 8425720000
Subtotal (1 unit)
HK$910.70
HK$910.70/unit
In Stock
Finder Relay, 12V dc Coil, 10A Switching Current, 3PDT
  • RS Stock No. 248-1582
  • Mfr. Part No. 553390120090
Subtotal (1 pack of 10 units)
HK$1,340.40
HK$134.04/unit
In Stock
Schneider Electric Harmony Relay Series Solid State Relay, 25 A Load, Panel Mount, 300 V ac Load, 32V dc Control
  • RS Stock No. 904-5651
  • Mfr. Part No. SSP1A125BDT
Subtotal (1 unit)
HK$416.00
HK$416.00/unit
In Stock
Finder 39 Series Interface Relay, DIN Rail, 110V ac/dc Coil, SPDT, 5.6mA
  • RS Stock No. 819-8809
  • Mfr. Part No. 39.01.0.125.0060
Subtotal (1 unit)
HK$168.40
HK$168.40/unit
Temporarily out of stock
TE Connectivity PCB Power Relay, 12V dc Coil, 12A Switching Current, SPDT
  • RS Stock No. 718-1718
  • Mfr. Part No. 1-1415899-0
Subtotal (1 unit)
HK$25.20
HK$25.20/unit
In Stock
Finder 34 Series Solid State Relay, 6 A Load, PCB Mount, 24 V dc Load, 30V Control
  • RS Stock No. 457-2868
  • Mfr. Part No. 34.81.7.024.9024
Subtotal (1 unit)
HK$293.90
HK$293.90/unit
In Stock
Schneider Electric Harmony Relay RXM Series Interface Relay 6A
  • RS Stock No. 203-5217
  • Mfr. Part No. RXM4AB2BDPVS
Subtotal (1 unit)
HK$196.80
HK$196.80/unit
In Stock
Finder 93 5 Way 24V dc DIN Rail Relay Socket, for use with 34.51 Series Relay, 34.81
  • RS Stock No. 666-8093
  • Mfr. Part No. 93.01.7.024
Subtotal (1 unit)
HK$98.60
HK$98.60/unit
In Stock
Finder Power Relay, 24V dc Coil, 10A Switching Current, 3PDT
  • RS Stock No. 350-686
  • Mfr. Part No. 60.13.9.024.0040
Subtotal (1 unit)
HK$165.70
HK$165.70/unit
In Stock
Phoenix Contact PCB Power Relay, 24V dc Coil, 6A Switching Current, SPDT
  • RS Stock No. 290-1416
  • Mfr. Part No. 2961105
Subtotal (1 unit)
HK$116.30
HK$116.30/unit
In Stock
ABB CR-P 24V dc DIN Rail Relay Socket, for use with CR-P Series PCB Relay
  • RS Stock No. 775-5221
  • Mfr. Part No. 1SVR405652R1000 CR-P/M 42V
Subtotal (1 unit)
HK$38.90
HK$38.90/unit
In Stock
Panasonic PCB Automotive Relay, 24V dc Coil Voltage, 20A Switching Current, SPDT
  • RS Stock No. 811-3195
  • Mfr. Part No. CB1-M-24V
Subtotal (1 unit)
HK$57.70
HK$57.70/unit
In Stock
Tempatron 2B Series Timer Relay, 2-Contact 240V ac, 1.5 → 30 min, 1-Function, DPDT Switch Configuration
  • RS Stock No. 347-927
Subtotal (1 unit)
HK$742.40
HK$742.40/unit
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