The Thermal Protector SM1 from Thermik Corporation is a normally closed temperature controller designed for automatic reset. It features a compact design suitable for closely built-up circuits, with a quick response sensitivity due to its low mass and conductive housing. The device operates by utilizing a bimetallic disc that snaps to open the contact when the rated switching temperature is reached, effectively interrupting the current flow to protect the device. Upon cooling, the bimetallic disc returns to its original position, closing the contact again. The SM1 has a nominal switching temperature range from 70 ¬8C to 180 ¬8C, with a standard tolerance of ¬±2.5 K or ¬±5 K. It can handle an operational voltage of up to 500 V AC and a rated current of 2.5 A at cos oï = 1.0 for 10,000 cycles. The device is constructed with high-temperature resistant materials and has a total bounce time of less than 1 ms, ensuring reliable long-term performance. It is suitable for installation in protection classes I and II and has various approvals including IEC, ENEC, VDE, and UL. The SM1 is equipped with connector cables and insulation made from Mylar¬Æ-Nomex¬Æ.
The switchgear of type series F1 is fixed in a positive lock and is self-aligning between the floor of a conductive housing (1) and a contact cap which is made of steel (2) and insulated from it, and which closes the housing like a button cell. The spring snap-in disc (3) which forms the current transfer element also bears the movable contact (4) and discharges the flow of current and self-heating from the bimetallic disc (5) by exercising consistent, steady contact pressure. The bimetallic disc (5) is held on the one movable contact (4) 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 (5) snaps into its inverted position and pushes the spring snap-in disc (3) 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 (5) snaps back into its start position when reaching the defined reset temperature and the contact is closed again.
| Thermik Corporation | |
|---|---|
| Product Category | Thermal Switches and Thermal Protectors |
| Product Number | SM1 |
| Product Name | Thermal Protector (Temperature Controller) |
| Switch Type | Normally Closed, NC |
| Features | Automatic Reset |
| High Temperature Set Point | 158 to 356 F (70 to 180 C) |
| Maximum Current | 6.3 amps |
