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Technobots Dual Channel RC Relay - Type A

Technobots Dual Channel RC Relay - Type A

£22.96 incl VAT
(£19.13 exc. tax)
Price in points: 3826 points
60.00 g.
Currently Unavailable
Discontinued Product

As part of our review into the product ranges we stock, we no longer stock our dual channel RC relays. It remains a very popular RC relay and is once again available from the original designer Alan Bond of Forge Electronics'. Please visit the Forge-Electronics website for pricing and availablility. A direct link is http://www.forge-electronics.co.uk/index.php/boats/dual-10a-rc-relay

After 10 years of supplying RC relays, Technobots have now produced their own model. Naturally it incorporates features not found in other other RC relays and best of all, it comes ready boxed for ease of mounting in your model.

Main Features:

  • Dual Channel
  • 10A 30Vdc / Channel Relay rating
  • SPDT relays - reversing motor control easily implemented
  • Fully rated 16A terminal blocks with terminals on a 5mm pitch for wiring up to 2.5mm2
  • Uses a high quality through hole plated PCB with double weight copper for higher current handling
  • Latching and non-latching modes
  • Built in failsafe that de-energises both relays in the event of loss of RC signal 
  • Power up delay of 4 seconds that prevents false triggering whilst radio receivers initialise
  • Supplied in a flanged box with mounting holes 56Lx40Wx24H excl flange, 76Lx42.5x24H Overall
  • Weight 54g
  • Includes lead that plugs directly into the radio receiver
  • Access to relay connections available even when mounted within enclosure
  • Takes its power direct from the receiver supply
  • Supplied complete with instruction booklet



This unit allows the signal from a standard radio control receiver to independently activate a pair of relays, each capable of switching up to 10amps at 30volts for the control of lamps, motors, bilge pumps, solenoids, sound effects etc..

This is an alternative method to that often used of fitting a servo with a cam to operate a microswitch at some point on its travel.  A further benefit is that this unit's software allows the user to optionally configure the switching action to be latching or non-latching (momentary).  Latching action is mainly used for circuits intended to stay ON the majority of the time (lights, smoke generators etc..) whereas non-latching is mainly used for circuits that will only be switched ON briefly (sound effects, bow thrusters etc..).

As this is a dual switch unit, it is intended for use with a (spare) proportional channel of the receiver to allow the user to operate the relays independently i.e. moving the transmitter joystick in either direction from centre operates the appropriate relay.

If used on a switched digital channel of the receiver, both relays operate simultaneously and in opposition (ie one ON and the other OFF, then vice versa). This is not recommended.

A dual switch unit, like this one, can be wired up to give simple forward/reverse/stop control of a motor – be it a robot buggy, a bow-thruster in a model boat or the head on your R2D2.  A wiring diagram for this application is included in the instructions (see 'Downloads' tab).


Receiver voltage range: (servo socket) 4.4 to 6v
Receiver Channel: A single proportional channel allows independent operation of each relay (1.5mSec neutral assumed) Use of a single switched channel will result in simultaneous operation of the relays in opposition
Relay Contacts: Two single pole changeover relays rated 10amp, 30volt. Beware that inductive loads can draw far more current at switch on that its nominal rating which should be taken into account
Operating it current:  130mA max (both relays energised)
Operating Modes: Each switching channel may be configured for latching or non-latching operation by its jumper link
Loss of / Invalid Signal:  Both relays turn OFF and twenty consecutive 'good' pulses (less than 0.5 sec in total) must be received before normal operation  resumes
Switch-on Delay: At power-up, both relays are held in the OFF state for a period of 4 seconds. This is to allow time for RC receivers (particularly 2.4GHz and PCM types) to stabilise/lock-in, to prevent inadvertent operation of the attached loads at power up
Connections:  Two 3-Way 16A terminal blocks for relay connections that can accept wiring up to 2.5mm2

Download a PDF of the full instructions from the 'Downloads' tab.


Manufacturer's Details

Manufacturer's SKU :
3400-042 Type A

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Write a review

Hi. when I tested this with my Spektrum DXe with AR610, the switch activates in one direction but will only activate in the other direction if I use the trim button..... then it won't work the first way until I re trim. ie the trip points are too far apart for the joystic movement. Any suggestions?

Asked by Peter T | 22/11/2016, 21:59 | 1 answer(s)

Hi, i was wondering when you will have these back in stock?

Asked by Gareth Anstee | 19/01/2015, 17:12 | 1 answer(s)

Got this controlling the tipper on an rc dump truck, using a RE540 12v 50:1 geared motor, got it wired exactly as shown in the booklet to run a motor in both directions, works fine when the motor isn't under any load but when it's connected to and lifting the empty tipper body it keeps starting and stopping intermittently, the tipper motor works great when connected straight to the battery, the relays are rated at 10amps I can't believe the motor is drawing more then that even lifting the tipper or could it be overloading the relays?

Asked by gaz | 29/07/2014, 20:07 | 1 answer(s)

If you read the datasheet http://www.farnell.com/datasheets/388244.pdf you will note that the DC contact rating is 7A. The max DC current is 10A, but you should not design for a switching current in excess of 7A as this will compromise the electrical life of the relay. HTH

Asked by Smudger | 27/07/2011, 19:34 | 1 answer(s)

I am writing this in reference to the Dual channel RC relay type A Part no 3400-042, I am building a gun elevation on a 1/6 thscale tank and I would like to know if I can use this relay to operate the motor to make the gun go up and down ,I would also need to add limiter switches so the power will be cut off when the gun reaches the top and the motor reversed so the gun can go back down with another limiter switch at the bottom of the gun travel, is it possible to do this with this relay? I look forward for your kind reply Joe Grech

Asked by Joe Grech | 26/06/2011, 20:25 | 1 answer(s)

typos in pdf (not for publication on here!) SPEC (relay contacts) " . . . .switch on that its nominal . . . " - ". . . switch on than their nominal . . . " WIRING (receiver) ". . .is capable of supplying . . ." - "make sure it is capable of supplying. . . "

Asked by Alan Bond | 05/05/2011, 19:39 | 0 answer(s)

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