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Battery master isolator switch for dashboard mounting etc equivalent to Lucas ST330, 76605. Mounting flange (53mm hole centres). The body is 43mm in diameter. The knob is marked with 'OFF' and arrow. The knob can be detached for installation by removal of the rear C circlip. Usually mounted into earth lead.
The continuous load rating at 12v is 150amps
Short/Max load at 12v (example starting) is 500amps
The third (low current) terminal is optional to allow the switch to function as an emergency engine cut-off by earthing a feed from the points or coil when the switch is in the OFF position - see wiring instructions.
