The term Circular Terminal block applies to any electrical terminal block possessing multipin interconnects with cylindrical contact housings and circular contact interface geometries. Circular terminal blocks are selected for ease of engagement and disengagement, their ability to conveniently house different types of contacts, their wide range of allowable contact voltages and currents, their ease of environmental sealing and their rugged mechanical performance. In military, aerospace, and other high-reliability applications, the MIL-DTL-5015 and MIL-DTL-38999 are among the most commonly specified types. The primary disadvantage of the circular design is loss of panel space when used in arrays when compared to rectangular terminal blocks.
The following Terminal block Terms and Definitions apply to circular terminal blocks.
Accessories or Backshells are mechanical devices (e.g., strain reliefs, cable clamps, adapters, potting boots) that are threaded onto the rear terminal block accessory threads of plug or receptacle terminal blocks to make up the total terminal block assembly.
Bayonet Mount interconnect mating designs use pins on the receptacle and ramps on the plug for quick-connect and disconnect coupling. Reverse Bayonet puts the pins on the plug and ramps on the receptacle.
Contact refers to the conductive element in a terminal block that mate mechanically and electrically to transmit signals and/or power across a terminal block interface. Crimp style contacts are the most common type found in high-reliability cylindrical terminal blocks. Male terminal blocks are sometimes referred to as leads, posts or pins, while Female terminal blocks are universally known as sockets.
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