The CYM6AL type thermal overload alarm non action circuit breaker has an overload alarm non trip thermal magnetic plastic shell circuit breaker. It is a thermal magnetic plastic shell circuit breaker with overload alarm non trip, and its non trip device includes three sets of trip mechanisms containing bimetallic sheets, brackets, and traction rods, and a rotating shaft passing through the three sets of trip mechanisms. The bimetallic sheets in each set of trip mechanisms are equipped with brackets, and the rotating shaft passes through the traction rod. The force direction of the traction rod points to the axis of the rotating shaft. Each set of trip mechanisms also includes a micro switch and a thermal element. The micro switch is fixed on the bimetallic sheet through the bracket, and the micro switch is also connected to the peripheral alarm circuit. The thermal element is connected to the bimetallic sheet. This utility model installs a micro switch as a triggering device on a bimetallic sheet, providing normally open contacts for the peripheral alarm circuit and realizing the overload alarm function of the thermal magnetic plastic shell circuit breaker without tripping. Its structure is simple, the cost is low, and it can continue to work reliably in high temperature environments. It also has the alarm characteristic of overload long delay action, which can meet the requirements of continuous power supply in special places such as fire protection, chemical and medical.