Relays

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.
Related Products
The S1 series reed relays are miniature high ...
Description:
The S1 series reed relays are miniature high voltage single in line relays. S1 reed relays are designed for applications with limited space. Single in-line package4kV isolation voltage across contactsContact to coil 5kV isolation voltageCarry current 2.5AUp to 350V switching ...
Miniature reed relay in a dual-in-line (DIL) package ...
Description:
Miniature reed relay in a dual-in-line (DIL) package with a choice of normally open, normally open high-voltage, normally closed or changeover contacts capable of switching up to 300Vdc at 10W. Available with 5V, 12V and 24V coils and diode suppression. ...
Washproof reed relay for DC voltageMonostableFor installation in ...
Description:
Washproof reed relay for DC voltageMonostableFor installation in pushdown switches (RM 2.54 mm)Low contact noise, low thermo voltageAvailable with shielding plate for electrostatic protection and spark extinguisher / damper diode.
Coil covered with a thermoplastic casing according to ...
Description:
Coil covered with a thermoplastic casing according to UL 94V-0M4 screw fastening optionHigh insulation resistanceMaximum continuous current: 5AVibration resistance: 20g at 50 - 500 Hz Operating temperature: -20°C to +70°CMaximum switching current: 3AMaximum switching power: 50W.