PWM Electronic Relay Switch

£7.50£9.00 Inc. VAT

RC hobbyists often use relays to control high-power devices such as smoke generators & rocket launch systems.

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Description

What is a Relay?ย Relaysย are electromechanicalย switchesย that open and close circuits by receiving electrical control signals from outside sources.ย For RC related applications, the control signalย isย PWM provided from a radio receiver, flight controller orย device like a servo tester. Relaysย are particularlyย useful as they provideย electrical isolation between the signal generator i.e. your radioย receiverย and the device being controlled. This can protect the receiver from potential damage due to voltage spikes or electrical faults in the controlled circuit.

RC hobbyists often use relays to control high-power devices such as smoke generators, lights, rocket launch systems, or other electronic components that require more current or voltage than what the RC receiver or controller can directly handle. Aside from power applications, relays can be used to switch between multiple devices or circuits with a single RC channel. This can be useful for tasks like selecting different lighting configurations, switching between different motors;ย or triggering auxiliary functions like deploying landing gear, activating camera systems, or releasing payloads in drone or robotics applications.

How to use a relayย 

A single relay module typically has 6 electrical connections; three connectors for the control circuit and three for the switching circuit.

For the control side there is a PWM signal input connection (S), and power input (+ / -). You would connect your radio receiver to this side of the relay module.

On the switched circuit side of the module, youโ€™ll see the three switched connection points marked NO (Normally Open), COM (Common), and NC (Normally Closed).ย The relay can be triggered to switch between the NO and NC circuits. The NO circuit will by default be turned off and when triggered will be turned on, while the NC circuit works the opposite and is on by default and turns off when triggered. The Common contact is the switching point of the circuit.

When you want to control power to a device using a relay module, you will have to disrupt its electronic circuit. Any DC device contains two wires that create a circuit. To connect your device to the relay,ย intersect one of the wires and connect the two open ends to the relay switch. One wire should be connected to the COM terminal and the other to either the NO or the NC switch. Whether you connect to NO or NC depends on whether you want the device switch on or off when the relay isn’t being triggered.ย For example, say we want toย control a light and have theย lamp be turned off until we switch it on. We would need to connect the second wireย to the NO terminal in this case.

Specification

Relay Switch (20A / 14V):

  • Support receiver voltage: 5-12V
  • Current Rating: 20A
  • Voltage Rating: (Switched Side): 14V DC
  • Size:ย 45mmx18mmx15mm
  • Weight:ย 14g

Relay Switch (10A / 30V):

  • Support receiver voltage: 5V
  • Current Rating: 10A
  • Voltage Rating: (Switched Side): 30V DC
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SHIPPING & DELIVERY

We are based in the UK, but ship to most worldwide destinations. Postage rates are calculated by the size/weightย and shipment location. We process orders Monday to Friday and pride ourselves on our quick turnaround of orders - most UK orders will arrive the next day.

We are partnered with several delivery companiesย including Royal Mail, DHL, UPS and Parcel Force. If you have a special delivery requirement or would like to arrange a shop collection pleaseย contact us.

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  • Order before 4PM for same day dispatch with Royal Mail, 2PM for next day delivery with DHL and 1PM for next day delivery with APC.
  • We offer FREE Shipping on UK orders over ยฃ99, weighing less than 1kg.
  • The courier options deliver Monday to Friday, Royal Mail delivers to residential addresses on Monday to Saturday.

For small low value orders our cheapest delivery service is Royal Mail First Class.ย For a guaranteed next day delivery we recommendย Royal Mail Special Delivery orย one of our courier delivery options.

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