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Hammond: Expanded 1551 Enclosure Family for Housing IoT Sensors

March 8, 2022

The standard ventilated 1551 family of miniature plastic enclosures from Hammond Manufacturing are designed to house sensors and small sub-systems installed in industrial environments. These enclosures have proven very popular due to one of their key features being the snap-fit closure that allows repeated opening and closing without tools and also maximises the internal space for PCBs by eliminating screw fixings to secure the cover to the base. The enclosures feature ventilation slots on all four vertical faces of the cover allowing sensors to detect the surrounding environment, the base of the cases feature wall mounting slots and a 15mm cable knock out in the base for extra convenience.

The 1551 family is offered in square and rectangular shapes and they have now introduced three round versions and the additional option of plain, unventilated covers throughout. In some applications, the entry of air and moisture into the enclosure is either not required or detrimental to the reliability of the electronics; the new plain cover versions offer increased protection against dust, dirt and moisture verses the vented enclosures, which are designed for housing environmental sensors.

The 1551 family is now available in 4 square and rectangular sizes of 80 x 80, 60 x 60, 40 x 40 and 80 x 40mm, all 20mm high and the new round versions are offered in 45, 60 and 80mm diameter, again all 20mm high. Due to the snap-fit closure mechanism this has allowed Hammond to remove the pillars from the inside of the enclosure which would usually be required for screw fixed types, this allows increased space for the PCB, in addition the enclosure bases are all fitted with 4mm PCB standoffs allowing users to secure the PCB in position via screws. The square and rectangular enclosures can accommodate maximum PCB sizes of 74 x 74, 54 x 54, 34 x 34 and 74 x 34mm respectively whilst the round enclosures can house maximum PCB sizes of 39, 54 and 73.50mm diameter respectively.

The Hammond 1551 family enclosures are suited to a wide range of applications including data loggers, sensors, environmental monitoring, industrial equipment, IoT devices, speakers and audible indicators and many more

  • Snap-fit closure for easy assembly and opening without tools
  • Wall-mounting features include slots and central 15mm diameter cable knockout
  • Available in Square, Rectangle or Round shapes
  • 4 size options for Square types and 3 for Round types
  • 3 colour options: black, grey and white
  • Choice of vented or unvented
  • Pillarless construction allows maximum PCB area
  • Bases feature 4mm high PCB stand-offs
  • Moulded from robust ABS material
  • Flame retardant to UL94-HB
  • Designed to meet IP30
  • Satin texture finish

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