Thermal Protector

JS 01 (2.5A) Normally Close is fixed in a positive lock and is self-aligning between the floor of a conductive housing and a contact cap which is made of steel and insulated from it, plus an integrated stationary silver contact which closes the housing like a button cell. At the same time, the spring snap-in disc which forms the current transfer element bears the movable contact and discharges the flow of current and self-heating from the bimetallic disc by exercising consistent, steady contact pressure. The bimetallic disc is held on the one movable contact which sticks out through this without having to be welded or fixed. As such, it can continually work (exposed) and only reacts to the ambient temperature in the device to be protected. When the rated switching temperature is reached, the bimetallic disc snaps into its inverted position and pushes the spring snap-in disc downwards. The contact is abruptly opened and the temperature rise of the device to be protected is disrupted. If the ambient temperature now falls, the bimetallic disc snaps back into its start position when reaching the defined reset temperature and the contact is closed again.

JS 02 (2.5A) Normally Open is fixed in a positive lock and is self-aligning between the floor of a conductive housing and a contact cap which is made of steel and insulated from it, plus an integrated stationary silver contact which closes the housing like a button cell. By means of a throw force a bimetallic disc pushes the movable contact that sticks out in the middle of it onto its circumferential collar against the spring snap-in disc that is also surrounding the contact. Due to the higher throw force of the bimetallic disc the switch contact remains open against the mechanical resistance of the spring snap-in disc before reaching the rated switching temperature. As such, the contact also remains open as long as the bimetallic disc – only reacting to the ambient temperature – continually works and its shape changes. The bimetallic disc only snaps into its inverted position when the rated switching temperature is reached and the contact is closed by the abruptly released pressure of the spring snap-in disc. The spring snap-in disc is now a transfer element for electric current and as such, it enables the bimetallic disc to continue to work on a continuous basis. When the reset temperature is reached, the bimetallic disc snaps back into its start position and the contact is opened again.

JS 06 (10A) Normally Close is consisting of a mobile and circular contact bridge, a contact bearing pin, a spring snap-in disc and a bimetallic disc which is riveted into one another, undetachable and fixed in a positive lock and self-aligning between a non-conductive floor of a housing and an insulating ceramic bearing with two integrated stationary contacts as electrodes. At the same time, the switchgear is supported by the spring snap-in disc with the contact bridge acting as a transfer element for electric current which is held between a supporting collar and a circumferential ring. As such, the bimetallic disc underlying it, that is also stuck out from the contact bearing pin, can continuously work (exposed) by mechanical loads without the contact pressure defined by the spring snap-in disc diminishing. As soon as the bimetallic disc reaches its rated switching temperature, it effectively springs against the throw force of the spring snap-in disc into its inverted position. The contacts are abruptly opened. The temperature will now fall. The bimetallic disc will only snap back upon reaching a defined reset temperature and the contacts will be closed again. As the contact bearing pin is appropriately dimensioned, an easy, circular rotation of the circle-shaped contact bridge is enabled with every switch so that transfer resistances remain constantly below the minimum limit after many switch cycles and the long term stability is sustained even under high levels of stress.