Delay starting circuit and switch

The utility model provides a delay starting circuit (01) and a switch, and belongs to the technical field of electronics. A voltage detection sub-circuit (012) in the delay starting circuit (01) can control a first end (I1) and a second end (O1) of a switch sub-circuit (013) to be conducted when the voltage at the two ends of an energy storage sub-circuit (011) is larger than a voltage threshold value. Therefore, even if the voltage or current output by the power supply circuit (02) is small, the switch sub-circuit (013) can provide driving energy meeting the requirement of the post-stage circuit (03) for the post-stage circuit (03), so that the normal work of the post-stage circuit (03) is ensured. Moreover, the maintenance sub-circuit (014) provides a maintenance signal for the switch sub-circuit (013), so that the switch sub-circuit (013) can be ensured to be always kept in a conducting state when the voltage at the two ends of the energy storage sub-circuit (011) fluctuates, and the working stability of t