Number of poles:
These are switches that are used with sturdy bodies that have been sealed to where contaminants are not going to move into a switch. These are made with metal parts that will not corrode and can work in standard and locking options while using stamped circuit links on each switch as required.
Each model has a silicone rubber level seal to keep items from moving into its body. Terminal screws are also dipped in tin to make it easier for soldering to work as needed. This is made with a strong butt action feature to keep contact from being a threat. This is especially useful to make responses with care. The keyway is also 0.068 by 0.035 inches deep and can even be used with an anti-rotation feature.