ALFAMERIT GmbH

AlfaMeritTemperature Switch

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Bimetallic thermal switches, or temperature switches, serve as essential safety components by ensuring the protection of devices against overheating. These switches are ideal for installation within control cabinets or directly on transformers, motors, and semiconductor heat sinks. When the permissible temperature is exceeded, the switch interrupts the electrical circuit, thereby triggering or halting processes such as heating, cooling, or pumping. As the device cools, the switch automatically resets, either closing or opening the circuit as configured. The mechanism relies on a bimetal strip composed of two metals with distinct thermal expansion coefficients, responsible for activation at a predetermined temperature, and resetting at another defined point. AlfaMerit offers switches for a variety of temperature ranges and applications, with Duroplast bodies allowing for operation up to approximately 140°C and ceramic construction supporting up to 190°C.
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Bimetallic switches or temperature switches are used to protect components or devices from overheating. They are suitable for installation in control cabinets or for direct mounting on transformers, motors, semiconductor heat sinks, etc. If the permissible temperature is exceeded, the switch interrupts the circuit, allowing a process (heating, cooling, pumping, etc.) to be started or stopped. After cooling down, the switch automatically closes or opens again.

There are two sides to the coin, and they often determine a person's fate. Not quite as dramatic, but certainly similar, is the case with an electrical circuit. If it's closed, current can flow; otherwise, the flow of electrons stops. And the respective switching state can certainly determine whether something ends well or a serious malfunction occurs. As simple as the opening-closing principle sounds, a corresponding temperature switch must be just as reliable and precise.

Temperature switches or bimetal switches are used to protect sensitive components or devices from overheating. The switch contains a bimetal strip made of a composite of two metals with different thermal expansion coefficients. Initially, there is a triggering moment, the "switching temperature," and upon cooling, the "resetting" occurs at a defined temperature. Depending on the switch's configuration, the triggering moment can be an "open" or "make" contact, and therefore the reset can be a "make" or "closed" contact. In this way, bimetal switches can stop or restart processes such as heating, cooling, or pumping. At AlfaMerit, you'll find "open" and "make" contacts for a wide variety of temperature ranges and applications. With a thermoset body, switching temperatures of up to approximately 140°C can be achieved, and with ceramics even up to approximately 190°C. Simply visit the online shop now and then “switch quickly” with – AlfaMerit.

  • Contact design: Opener or closer
  • Provision: Automatically
  • Switching cycles (typical): 10000
  • Rated current: at (250VAC) 10 A
  • Dielectric strength: 1500 VAC (1 min)
  • Suitable for protection class: I, II
  • Tolerance: ±4K
  • Material (body): 30 – 160°C: Duroplat / 170 – 190°C: Ceramic
  • Material (floor): aluminum
  • Connections: For flat plugs, 6.3 x 0.7 mm
  • Versions: Switching temperatures see table below