Ignition Feed Relay PRO CON IF

£59.40£99.00 (ex. VAT)


Ignition Feed Relay PRO CON IF

Pro connect ignition / signal feed relay

DC Voltage Amps Size L x W x D mm Weight Part Number
12 80 140 x 60 x 40 0.25 kg IFR1280
12 160 140 x 70 x 40 0.30 kg IFR12160
12 240 140 x 80 x 40 0.30 kg IFR12240
24 50 140 x 60 x 40 0.25 kg IFR2450
24 100 140 x 70 x 40 0.30 kg IFR24100
24 150 140 x 80 x 40 0.30 kg IFR24150


Ignition feed/D+/signal feed relay:

This range of low cost low signal activated relays is the simplest in the range. It offers the ability to link together as many battery banks as you wish. You can therefore charge different battery banks on a boat / vehicle when the engine is running.

Ideal applications:

Boats with outboard motors and simple cabin batteries with no heavy loads on the cabin batteries, small vehicles / boats with auxiliary battery systems with low loads on the auxiliary battery bank which are not in excess of the rating of the relay so as not to overload the relay circuit.

Its limitations:

There is no current limit with this type of device. So avoid using it on a system which has a high secondary battery load. Such as a big inverter, anchor winch or bow thruster, as the surge currents associated with this type of equipment can destroy the unit. (See current limiting relays for this application).
Starter battery interlock. This unit has the ability to interlock with up to 2 engines starter motors to ensure the relay is inactive when starter motors are engaged. This protects the relay and avoiding fuses blowing.

Start up time delays:

A 30 second start up time delay prevents the relay coming on while the engine is being started. Again protecting the relay circuit and preventing fuses blowing and damage to the relay.

Advantage over a standard relay:

A standard relay has an activation feed via a cable. This feed takes about 0.5A to run. This adds the 0.5A to where you are taking the feed from, either the D+ on the alternator or key switch or oil pressure switch. This can place enough extra load on these circuits to cause a problem. There is also the secondary problem of voltage drop in the ignition feed cable affecting the relay.

The Sterling IF product overcomes this by only using the ignition feed as a signal. It takes no power from the ignition feed wire. The signal then activates an internal control system, which in turn activates the relay from main power circuit internally. This also has the advantage of not suffering from voltage drops in the feed line and allows the relay to run cooler. This unit is also waterproof and in a much safer package form. The package also contains anti-spark protection to help reduce the effect of back EMF from open circuiting the relay under heavy loads, without this relays will weld close if the unit is switched off under high current pass applications. The connection terminals are also high quality brass nuts and bolts gold plated and not poor quality crimp connectors which are not suitable for high sustained current flow.


Product Information

0.01 volt drop Ignition feed (not always required)
Waterproof to IP65 SAEJ1171 ignition protected
High overload surge rating Back EMF spark arrester
1 LED information display Remote LED connection
No ignition feed voltage drop Suppression diodes across relay to prolong life
Time delay to prevent engine starter damage Single and Twin starter motor disengage connections

Additional information

Weight N/A
Power Variant

IFR1280 12V 80A, IFR12160 12V 160A, IFR12240 12V 240A, IFR2450 24V 50A, IFR24100 24V 100A, IFR24150 24V 150A

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