SEKI ST-22 thermal protector switch, bimetallic thermostat fuse 250V 5A 50-150C UL CQC VED KC
ST-22 Bimetal Thermostat / ST-22 thermal protector
SEKI's bimetal thermostats are overheat protection devices for electric appliances and they are reusable parts that are reset when equipment cools. If the fault still exists, the motor protectors continue to automatically protect the equipment. There're two models in our bimetal thermostat, ST-12 & ST-22. ST-12 is used for overheat protection for hair dryer, electric fan heaters, popcorn machines, electric ovens, dish dryers and etc. ST-22 bimetal thermostat is used for overheat protection for electric motors, fluorescent ballasts, battery chargers, transformers, solenoids, heating pads, OA-machines and etc. Motor Protector: Snap Action, Automatic Reset Bimetals, Moisture-Proof, Dust-Proof, Superior Heat Response ST-22 motor protector features snap action, automatic reset, moisture/dust proof, and superior heat response and high grade thermoplastic insulation, which can be used for overheat protection of Electric Motors, Fluorescent Ballasts, Battery Chargers, Transformers, Solenoids, Heating Pads, OA-machines and etc. | Application Overheat Protection for Electric Motors, Fluorescent Ballasts, Battery Chargers, Transformers, Solenoids, Heating pads, OA-Machines ETC. | Temperature Setting range (at no load): 70°C ~ 150°C | Tolerance ±5°C | ON-OFF Differential Temp (general): 30 ± 15K | Heat Endurance: Open temp. +50°C/continuity, 200°C/1 min. | Life test (Resistive Load): 8A/125V 10,000 cycles, 5A/250V 10,000 cycles | Contact Capacity: Min. Current 50mA/continuity, Max. Current 30A/5 cycles | Application view | | | |
Features |
- Snap Action
- Automatic Reset
- Superior Heat Response
- PBT Resin Case with Epoxy Sealing
- Moisture/Dust-Proof
- Wire Customization Upon Request
- IP(Ingress Protection): IP45 (Solid 4, Liquid 5)
- IECEx(Explosion Proof)
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Application |
Electric Motors, Battery Chargers, Transformers, Power Supplies, Heating Pads, Fluorescent Ballasts, OA-Machines, Solenoids, LED Lighting, etc. |

The thermal protector consists of one or more heat-sensing elements built into the motor or motor-compressor, plus an external control device. The thermal protection is present to turn the motor off when excessive heat is generated within the motor circuitry.