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Thermal Protectors Series 01: Types L01 / LK1 / L02

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Application: Thermal Protectors of Series 01 - Types L01 / LK1 (NC) and L02 (NO) are utilised for overheating protection of all kinds of electrical equipment or devices, whereat after overheating and subsequent cooling an automatic resetting is required. A mount-on housing with a M4-srew allows to attach these types e.g. in switch cupboards, on heat sinks or on motor casings. The LK1 is the preferred type for low switching temperatures.

Design: The Thermal Protectors L01, LK1 and L02 are based on the well-proven mechanism of Thermik’s Types C01, CK1 and C02. These standard types are introduced into a housing with an M4-screw including an internal insulation between the switch and this housing.

Operation: If, in the case of overheating, the rated switching temperature of the bimetallic disc is reached, it suddenly snaps over and opens (L01 / LK1) or closes (L02) the contact. After cooling down beyond its resetting temperature, the bimetallic disc returns automatically to its initial position.




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Item #

Item Name

Diameter d Wrench Size

Height h

Screw / -Length

Contact Type

Nominal Switching Temperature

Switch Insulation

L01 Thermal Protectors Series 01: Types L01 (NC) 10.0 mm 8.3 mm M4 / 5 mm Normally Closed (NC) 60 - 200 ºC Insulation cap: Mylar - Nomex®
LK1 Thermal Protectors Series 01: Types LK1 (NC) 10.0 mm 8.3 mm M4 / 5 mm Normally Closed (NC) 60 - 200 ºC Insulation cap: Mylar - Nomex®
L02 Thermal Protectors Series 01: Types L02 (NO) 10.0 mm 8.3 mm M4 / 5 mm Normally Open (NO) 60 - 200 ºC Insulation cap: Mylar - Nomex®
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