New terminal design of 3120 thermal overcurrent circuit breaker with ON/OFF function

PT terminals increase speed and safety of wiring

Altdorf, 25. September 2015 – E-T-A Elektrotechnische Apparate GmbH, located in Altdorf near Nuremberg, presents the 3120-PT thermal circuit breaker/switch combination with push-in terminal adapters, an innovative version of the well-proven 3120 model. The device for use in apparatus, machinery and systems unites protection and ON/OFF operation in a very confined space. The push-in technology allows pushing in rigid conductors or conductors with wire end ferrules easily, safely and quickly into the terminals without any additional tools. The conductor itself opens the contact springs. The push-in forces required are much smaller compared to other direct connection technologies. This helps to prevent material fatigue in series assembly.

Safety is paramount: The connection by means of push-in technology is protected against brush contact. This excludes hazardous electric shocks. The contact spring is made of high-end spring steel and enables high contact and pull-out forces. Due to the high contact pressure the connection withstands even highest shock and vibration values.

Thanks to no-tool wiring the push-in connection technology is also suitable for installation areas where space is at a premium and where the wiring is hard to access. The conductors can easily and reliably be plugged in single-handed. A conventional screw driver is sufficient to remove the conductor.

E-T-A’s 3120 circuit breaker type has been one of the best-selling devices of the E-T-A product range for years. Thanks to its double function - ON/OFF switch and overcurrent protection in a single component - it supports design engineers when trying to reduce the number of components. In addition less components normally also allow a space-saving and thus more compact design of products. Type 3120 is very often installed in medical and laboratory equipment as well as in professional tools, household appliances and in apparatus and machine construction.


3120-PT thermal circuit breaker uses state-of-the-art push-in technology. (photo: E-T-A)

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