MP2883B 30 AMP SELF SWITCHING DUAL CHARGE RELAY

Charging relays are suitable for 12S electrics and will charge a caravan leisure battery and/or power the fridge, while the vehicle is running. It also protects the vehicle battery from drain when the engine is turned off.
Also ideal for charging batteries in Tipper trailers, winch batteries etc

Combination caravan relay with automatic voltage monitoring and switches the power supply from car to caravan
Self switching voltage sensor relay
Provides power for refrigerator and charges auxiliary battery
Automatic monitoring of voltage and current availability from car’s alternator/battery
No separate signal wire necessary
Able to switch 30 amp continuously when available from car’s alternator/battery
Adjustable factory set voltage trip with narrow band hysteresis
Over temperature protection
Line voltage drop compensation
Low voltage drop (around 0.1v) at rated output
Made in the UK Fitting instructions included

FAQ
What's the purpose of the plastic philips screw head that is visible through the hole on top of the TEC3M relay?
The TEC3M will change its state dependant on the standing voltage of the battery onto which it is connected. Under factory set condition, whilst the vehicle engine is running the relay expects to see a voltage exceeding 13.5V; when this voltage is reached and maintained it will change its state to a closed condition, suppling voltage to the auxiliary unit.
When the voltage of the vehicle battery falls below 12.9V will it disengage the supply, so on a vehicle with a healthy battery it is normal to see the supply maintained to auxiliary source for a period of time after the engine is switched off.
Adjusting the pot on the top of the device will vary the voltage the unit opens and closes the relay contacts.