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Well, TIL the acronym SSU: Box cover for standard electrical boxes that provide fused outlet, fused switch or circuit fuse protection.
Just so, what does SSU switch stand for?
SSU stands for Switch Supervisory Unit.
Also Know, what is SSU electrical?
Subsystem for Power Control (SSU) It is aimed for distribution, control and protection of power supply lines of power equipment as well as for recording power consumption at oil, gas and petrochemical and other facilities.
It's usually mounted on the side of the furnace or a wall nearby. Among other benefits, this switch allows you or your plumber or repair technician to shut off the electricity to the furnace without having to go to the main service panel to switch off the circuit breaker.