Official distributor and wholesaler of relays from brands such as Crouzet, Crydom and Finder
UK Next Day Delivery
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Over 40 Years Experience
E. Preston Electrical
Relays
What is a Relay?
Relays are electrically operated switches that open and close circuits receiving electrical signals from external sources. The relays built into electrical products work in a similar way; they receive an electrical signal and send the signal to other equipment by turning the switch on and off. The three main functions of relays are to allow a small amount of electrical current to control high current loads, send different types of electrical signals, and drive multiple outputs with just one input.
What Do We Supply?
We have a broad range of relays in stock, including:
Modular step relays
Monostable relays
Ultra-slim PCB relays
Relay interface modules
Miniature PCB/plug-in relays
Low profile PCB relays
Miniature industrial relays
Safety relays
Power relays
Miniature power relays
Solid State relays
Relay bases
Coil indication
EMC protection
Why Choose E. Preston?
We are an official distributor and wholesaler of relays from brands such as Crouzet, Crydom and Finder. These are well known companies in their fields with excellent reputations for the quality of their products.
What really sets us aside from our competition is our choice and range of relays – you really don’t need to look anywhere else for your requirements.
As we have been operating for over forty years, we have developed a fantastic relationship with our suppliers. This benefits us in two main ways: We gain access to the widest choice of components from those suppliers, and secondly, they sell us those components at competitive prices because we purchase such significant volumes. We are able to pass on those competitive prices to you, our customer.
We have a large stockholding of our products at our warehouse in Dukinfield, Cheshire in the UK. This stock means that our product availability is consistently high, and we can get your order for stock items out to you in a 24 to 48 hour time frame.
The 78 Series is a range of low profile modular power supplies for electrical cabinets and industrial switch mode power supplies. KNX power supply with rated output 30V DC 640mA available.
Function & Features (according to type):
Output powers 12, 36, 50, 60, 120 or 130 W
Input (110 … 240) V AC or 220 V DC
Class B according to EN 55022
Replaceable input protection fuse plus spare
Varistor for protection against overvoltages
Width 17.5, 40 or 70 mm
Applications:
Building Automation
Elevators and Lifts
Automation for Blinds, Grilles and Shutters
Hoists and Cranes
Panels for Electrical Distribution
Pump Control
OPTA Power Supply
Optimal Performance and Maximum Protection with Finder's Power Supply Type 78.12….2482, specifically designed for use with OPTA
Providing the power needed to operate Finder’s PLRs (Programmable Logic Relays), the OPTA power supply provides a 24 V DC supply voltage, and can handle high inrush currents.
The OPTA power supply is also surge protected – from surges attributable to the power grid, overheating, short-circuits, and those generated by other connected devices – ensuring a reliable and durable product.
The OPTA power supply is also suitable for use in SELV (safety extra-low voltage) systems (according to EN 60950). The Type 78.12….2482 has attained ENEC and UL certifications – attesting its compliance with international safety standards. Here are some of its features and specifications.
Features & Specifications:
17.5 mm (1 module) x 61 mm deep
Low (< 0.4 W) stand-by power consumption
Thermal protection: internal, with Vout shutdown – power OFF to reset
Short circuit protection: Hiccup (auto-recovery) mode
Overvoltage protection: Varistor
Flyback topology
Compliant with EN 60950-1 and EN 61204-3
Parallel working for automatic redundancy – with OR diodes
With the new switch from the MSM II family with M12 connector (8 pins), Schurter is focusing on a solution that has been specially developed for demanding industrial and commercial applications. Thanks to the M12 connector system, robust construction, and integrated RGB illumination, this switch combines maximum reliability, functionality, and modern design in a compact unit.
The standardized M12 connector ensures fast, secure, and error-free installation—without any complicated wiring. Thanks to the fixed pin assignment, wiring errors are effectively avoided, which not only simplifies installation but also speeds it up considerably.
The mechanical design is made for permanent industrial use—shockproof, vibration-resistant, and resistant to tough environments. This means the switch will keep working reliably for years, even in extreme conditions.
The three-color RGB illumination provides clear status indication or individual signals. Example: green = active; red = off; flashing orange = error condition. This makes the switch ideal for machine controls, control systems, or user interfaces.
The new Schurter MSM II M12 switch is suitable for applications where installations must be made quickly, easily, and safely. It is used in industrial automation, machine and plant engineering, as well as in public and commercial areas where clear signaling and high reliability are required.