Towing or Caravan Relays can be separated into four main product types according to their function.
Caravan or Combi or Split Charge Relays switch current to the caravan’s leisure battery
and/or fridge during towing, but in order to protect the car’s battery, become open circuit when
the engine is switched off. They may be ignition controlled, requiring a separate signal wire connected
from the ignition switch to the device, or they may switch automatically, with an electronic circuit
within the device remotely sensing the state of the car’s alternator/battery, and only switching when
sufficient current is available.
|Towing Electrics’ Combi Relay (TEC2M)
is such a device, which monitors the state of the car's
alternator/battery. It has all the features that you would expect from a self switching combi relay,
including factory set voltage trip with customer enabled adjustment, narrow band voltage hysteresis,
over temperature protection and line voltage drop compensation. And it does all this in the smallest
package on the market using very high quality 30 amp relays suitably derated.
Because of heat dissipation limitations, many self switching combi relays spend more time switched off than switched on and carrying current,
thus effectively reducing their rated output. Towing Electrics’ combi will operate continuously at 15 amps with around 0.1v drop across its terminals.
A 30 amp version (TEC3M)
is available to cope with the demand from high output
fridges found in modern caravans, which because it has such a high output in such a small package has become the preferred format.
A trigger only version is also available for use with separate combi relays (TEC0M)
, as are single and double ignition switched combination relays. (TEC1
Fog Cut-Off Relays