What is the difference between a two-stage switch and a single-stage switch?

 Single pole switch for lighting switch;

A bipolar switch for the lighting switch can also be used for the outlet power switch.

According to the need to determine, the single-pole switch can only control one line, and the two-pole switch can control two lines separately. The single-pole switch saves half the volume compared to the bipolar switch. The single-pole switch is a rocker switch that controls one branch. The two-pole switch is the two rocker switches that control two branches. The single-pole switch is generally controlled. The fire line, while the bipolar switch is the simultaneous control of the live line, but both of them trip as long as the load specified by the switch is exceeded, which plays a safety role.

The number of poles of a single-pole switch refers to the number of lines that the switch opens (closes). For a single-phase line of 220V, a single-stage switch can be used to open the phase line (fire line, L line), while the zero line (N line) does not. After the switch, the phase line and the N line can also be opened simultaneously using the 2-stage switch. Corresponding to the 3-phase 380v, there are 3 or 4 levels of switch usage. The switch here generally refers to a circuit breaker.

Their respective uses:

1, bipolar switch

The dual control switch is a switch with two contacts (ie, a pair) that are normally open and normally closed. Usually two dual-control switches are used to control one lamp or other electrical appliances. There are two switches to control the switches of electrical appliances such as lamps.

For example, turn the switch on when going downstairs and turn off the switch when you go upstairs. If you are using a traditional switch, if you want to turn off the lights, you have to run downstairs to close, using a dual-control switch, you can avoid this trouble. The dual control switch is also used to control the luminaires that need to be forced to ignite in the emergency lighting circuit. The two ends of the dual control switch are connected to the dual power supply, and the one end is connected to the luminaire, that is, one switch controls one luminaire.

2, single pole switch

Single control is an ordinary switch, one switch controls one lamp, and dual control is used in two switches to control a lamp.