These are our small relays they typically measure about 30mm qube. and all do the same job.
Relays allow you to switch a large ampage with a small voltage in this case 12v and about 5W.
Some of these have a inline fuse, so the "power pins" 30 and 87 have a fuse between them. You use these relays when you need to switch and control the max ampage that a device is pulling. These relays use a standard blade fuse - not supplied.
Some are seethrough relays. These are used in safety devices that need to be tested. When you activate the relay you can see the relay switch move.
We also have the switchover relay. On these the 87A connection is powered all the time. When switched the 87 connection is powered. This is also known as the headlamp Main/Beem relay
These are all large 45x45x58mm heavy duty relays.
A relay is a device that allows you to switch a large amp load remotely using a very small voltage. All these relays only need 12V and about 10W to switch their very large ampage.
These relays are used to switch on and off things like winches, engine heater plugs, inverters, space heaters, cooling systems, high output bilge pumps.
Wiring:
There are two 6.3mm male spade connectors and two heavy duty 8mm brass poles.
The brass poles go from the battery (or a thick battry lead) directly to the load. Make sure that you are using wire that is large enough to take the load and avoid voltage drop over the length of the run.
The spade connectors. One - most people use the 85 pin. Runs from the switch that you are using lets say a float switch in a bilge system. The other pin (86) runs to negative.
When the float switch is activated by water in the bilge, a small voltage (12v) runs to the relay which switches the large ampage.
When the water is gone the float switch will go off and the relay is switched off.
The two side of the relay are not connected so a 12v relay can switch a 24v winch at 100A
A relay is not a fuse so choose a value that is a little above the needs of your devive.
This is the big one! 12V 500A relay. Made for switching you big items like a inverter or bow thruster.
As always simple wiring two poles for the switching wires and two 500A inline poles for the heavy cable. Very robust construction.
54mm by 38mm and 80mm tall. Fixing by two 8mm holes in the base. Can be run at any angle.