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12V, 10A Adjustable Delay Timer Relay (Delay ON or OFF)

  (27 Reviews)
Price:  £36.53   (£30.44 Exc. VAT)

Product code:  P00965



Incoming, 4-6 days

Download a comprehensive user guide here

This changeover relay operates on a +12V input signal and has an adjustable delay time (either a delay before ON or a delay before OFF) that the user can configure to meet the requirements of their application.

The relay operates in one of two modes:

  • DELAY OFF - a momentary +12V input is given (e.g. from a momentary switch), the relay energises and there is a delay before the relay de-energises. Note: If a continuous rather than momentary input signal is provided, the timer will commence when the signal is removed.
  • DELAY ON - a continuous +12V input is given (e.g. from an ON/OFF switch), there is a delay and then the relay energises (the relay de-energises when the input is removed)

In both modes the delay time is adjustable between 0.5 seconds and 6 hours, making this relay extremely versatile. The adjustment is made by removing the plastic plugs on top of the relay to access the dials beneath. The adjustment settings are shown in the table below:

Dial A setting

Dial B rangeOperating Mode


0.5..........10 secs

Delay before OFF


5..............60 secsDelay before OFF


0.5..........10 mins

Delay before OFF


5..............60 mins

Delay before OFF


0.5...........6 hours

Delay before OFF


0.5...........6 hours

Delay before ON


5..............60 minsDelay before ON


0.5...........10 mins 

Delay before ON


5...............60 secs

Delay before ON 


0.5...........10 secsDelay before ON













Terminal No.



+12V input signal


+12V for load (common terminal)




Normally Open (NO) output


Normally Closed (NC) output






Important: If the intended load draws more than 10A then this relay should not be used to directly switch the load. In this case the output should be used to switch the coil of a secondary relay that has a sufficient current rating and is fitted with a voltage suppression resistor or diode (e.g. P00694). This voltage suppression is important to prevent voltage spikes damaging the timer relay electronics.

Please note that due to the electronics used in this relay it is not possible to use it to switch the negative side of the circuit.

  • Relay type: Changeover with adjustable timer delay 
  • Voltage rating: 12V DC
  • Current rating: 10A max.
  • No terminals: 5
  • Terminal size: 6.3mm blade
  • Bracket type: None - use relay holder P00708
  • Overall dims (inc. terminals): 30 (L) x 30 (W) x 53 (H) mm
  • Current draw when timer is active: Approx. 35mA
  • Current draw when timer is inactive: Approx 5mA

Part Number:  T40205

Average Rating (27 Reviews):  
Write a Review and share your opinions!

works great
Friday, 1 November 2019  | 

out of the box and working very good stuff

Good product
Tuesday, 10 September 2019  | 

I only wanted a minimum delay but this worked well and I am happy with the result - it had the effect I wanted.

12v adjustable timer relay
Thursday, 21 February 2019  | 

Purchased this part to control delay off of an auxiliary water pump on my VW Bay Window project. I spoke to 12v Planet before I bought it and was given knowledgeable advice over the phone.

The relay was delivered quickly, easy to fit and set up and works perfectly.

Delay timer
Friday, 24 August 2018  | 

Just what I needed to keep cooling fan running after the compressor turns off. Easy to install even without any instructions. Just wish it was water Proof

Good eyesight needed
Monday, 28 May 2018  | 

All works ok, as described. But how to tell which program you are on it a matter of trial and error as there is no arrow on the miniature dial. Or if there is it's very hard to read.

Thursday, 3 May 2018  | 

exactly as describe and very fast shipping

Timer Relay
Tuesday, 17 April 2018  | 

Used these for creating a timed power supply for the aftermarket heated seat pads in our camper so they don't drain the leisure battery.
Easy to wire up (get the Standard Relay Socket and 6.3mm Female Blade Terminals).
You need a small screwdriver to rotate the adjusters and good eyesight to see the cross-head arrow but setting up is easy if you follow 12 Volt Planet's guide.

Monday, 12 February 2018  | 

needed a relay to be switched on by a 'pulse' but to keep the pump running after the first signal, and this does that perfectly. Just think it's a little pricey, but as long as it keeps working, thumbs up.

Low spec
Friday, 23 June 2017  | 

Adjustment dials not robust with very poor markings. Instructions minimal. Binned it and bought a higher quality item from Farnell for a couple of quid more.


We're very sorry to hear that you felt that the relay was not of adequate quality. Please note that we provide a comprehensive user guide on our website that you can download to assist in setting up and using the relay.

Timer relay
Wednesday, 21 June 2017  | 

Does exactly what it says, and first class service from 12 volt planet

Read all 27 customer reviews...

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