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
Relay Accessories

Relays
Relays

Signal Conditioners & Isolators
Signal Conditioners & Isolators

17586 Products showing for Relays & Signal Conditioning

1 of 880
In Stock
TE Connectivity DIN Rail Power Relay, 24V dc Coil, 8A Switching Current, DPDT
  • RS Stock No. 494-0637
  • Mfr. Part No. RT4S5LC4 1415074-1
Subtotal (1 unit)
HK$116.80
HK$116.80/unit
In Stock
GIC DIGICON Series DIN Rail Timer Relay, 1-Contact, 24 to 240 V dc 24V ac, 240 V ac, 0.1 s to 999 h,
  • RS Stock No. 714-0032
  • Mfr. Part No. V0DDTD1
Subtotal (1 unit)
HK$459.30
HK$459.30/unit
In Stock
Turck 2 Channel Galvanic Barrier, IECEx, ATEX
  • RS Stock No. 808-6510
  • Mfr. Part No. IM1-22EX-R
Subtotal (1 unit)
HK$2,148.70
HK$2,148.70/unit
In Stock
Better World
Schneider Electric Harmony Time Series DIN Rail Timer Relay, 2-Contact, 24 V dc 12V ac, 0.1 s to 100 h,
  • RS Stock No. 791-2742
  • Mfr. Part No. RE17RMJU
Subtotal (1 unit)
HK$683.30
HK$683.30/unit
In Stock
Sensata / Cynergy3 PCB Reed Relay, 24 V dc Coil, SPST, 10000 V dc Max, 2 A Max, 350 Ω
  • RS Stock No. 124-5083
  • Mfr. Part No. DAT72415F-HR/RS
Subtotal (1 unit)
HK$909.20
HK$909.20/unit
In Stock
Siemens 3RP25 Series DIN Rail Timer Relay, 1-Contact, 250 V dc 12V ac, 240 V ac, 0.05 s to 100 h, 1-Function, SPDT
  • RS Stock No. 831-6044
  • Mfr. Part No. 3RP2525-2AW30
Subtotal (1 unit)
HK$1,219.50
HK$1,219.50/unit
In Stock
Pilz PNOZ s4, 240V ac/dc, 48 V ac/dc Safety Relay, 3 Safety Contacts, 1
  • RS Stock No. 156-112
  • Mfr. Part No. 750134
Subtotal (1 unit)
HK$3,656.50
HK$3,656.50/unit
In Stock
Better World
Schneider Electric Monitoring Relay, 1 Phase, DPDT, DIN Rail, 24V ac, 240 V ac
  • RS Stock No. 124-0186
  • Mfr. Part No. RM22UA31MR
Subtotal (1 unit)
HK$1,970.49
HK$1,970.49/unit
In Stock
Finder 95 8 Way 250V ac DIN Rail Relay Socket, for use with 44.52, 44.62, 40.61, 40.52, 40.51 Series Relay
  • RS Stock No. 272-3137
  • Mfr. Part No. 95.75SMA
Subtotal (1 unit)
HK$54.30
HK$54.30/unit
In Stock
Better World
Schneider Electric Harmony Relay Series Solid State Relay, 50 A Load, Panel Mount, 530 V ac Load, 32V dc Control
  • RS Stock No. 922-2079
  • Mfr. Part No. SSP3A250BDRT
Subtotal (1 unit)
HK$1,527.40
HK$1,527.40/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 RIF-0-OPT Solid State Interface Relay 3V dc, 33 V dc DIN Rail Push-in
  • RS Stock No. 207-3310
  • Mfr. Part No. 2905293
Subtotal (1 pack of 10 units)
HK$2,051.60
HK$205.16/unit
In Stock
GIC Monitoring Relay, 1 Phase, DPDT, DIN Rail, 24V ac 24 V dc
  • RS Stock No. 794-3957
  • Mfr. Part No. MJ83BK
Subtotal (1 unit)
HK$619.20
HK$619.20/unit
In Stock
Pilz PNOZ s5, 240V ac/dc, 48 V ac/dc Safety Relay, 2 Safety Contacts
  • RS Stock No. 155-838
  • Mfr. Part No. 750135
Subtotal (1 unit)
HK$3,891.40
HK$3,891.40/unit
In Stock
Better World
Schneider Electric Monitoring Relay, 3 Phase, DPDT, DIN Rail, 480V ac
  • RS Stock No. 146-480
  • Mfr. Part No. RM35TF30
Subtotal (1 unit)
HK$2,476.40
HK$2,476.40/unit
In Stock
Sensata / Crydom 1-DC Series Solid State Relay, 40 A dc Load, Panel Mount, 100 V dc Load, 32V dc Control
  • RS Stock No. 145-0573
  • Mfr. Part No. D1D40K
Subtotal (1 unit)
HK$794.70
HK$794.70/unit
In Stock
Carlo Gavazzi RP1 Series Solid State Relay, 3 A Load, DIN Rail Mount, 265 V ac Load, 34V dc Control
  • RS Stock No. 859-3046
  • Mfr. Part No. RP1A23D3M1
Subtotal (1 unit)
HK$348.67
HK$348.67/unit
In Stock
Hongfa Europe GMBH PCB Power Relay, 24V dc Coil, 20A Switching Current, SPST
  • RS Stock No. 176-2790
  • Mfr. Part No. HF152FD/024-1HTF(335)
Subtotal (1 pack of 5 units)
HK$57.40
HK$11.48/unit
In Stock
TE Connectivity PCB Power Relay, 24V dc Coil, 5A Switching Current, SPDT
  • RS Stock No. 253-6876
  • Mfr. Part No. PE014024
Subtotal (1 unit)
HK$27.20
HK$27.20/unit
In Stock
Finder PCB Power Relay, 12V dc Coil, 8A Switching Current, DPDT
  • RS Stock No. 351-572
  • Mfr. Part No. 40.52.7.012.0000
Subtotal (1 unit)
HK$53.30
HK$53.30/unit
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