Vintage Car Parts

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Guide: Battery Cut Off Switch


Fitting and wiring guide for the Lucas-type SSB103 Rotary Battery Isolator Switch

Also applicable to parts 463P and 463L

Classic car battery master cut-off isolator and ignition kill switch. Lucas SSB103 type with round knob - as used on Austin Healeys, Aston Martin, Land Rover, MGA, Morris etc.
Also listed as 76604, 76605, 1B2804, ST330

Panel / dashboard mounted

Connect to the NEGATIVE side of the battery.

Requires a hole 43mm in diameter if surface mounted, or 20mm for rear mounting - remove the knob by removing the small circlip from the shaft end at the rear.
M8 Studs

Suitable for 6v, 12v or 24 volt.
The continuous load rating at 12v is 150amps
Short  Max load at 12v (example starting) is 500amps

Voltage 12v 24v
Continuous Load 150 amps 75 amps
Short Max Load 500 amps 250 amp

Rear of SSB103 Battery Isolator Switch

B - Battery Negative terminal

E - Earth - Vehicle body

CB - Contact Breaker connection (Optional) Low Current only.
Some vehicles have a wire (White/Black) from the coil to CB. This serves as an ignition kill-switch (connecting CB to E) when the switch is in the OFF position.