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Yellow 22 mm metal mushroom-head push button with metal bezel

Schneider Electric

Schneider Electric ZB4BS55 22 mm Yellow Mushroom Head Push Button

SKU CH-0V4F-VET35

A 22 mm maintained mushroom-head push button with yellow metal head and bezel, rated IP66 and NEMA 1, 2, 3, 4, 4X, 13 for industrial control panels

  • TypeIndustrial Electrical Controls & Automation
  • Size22 mm
  • 22 mm mounting fits standard panels
  • Yellow mushroom head gives high visibility
  • Maintained action holds position until reset
  • IP66 and NEMA 4X ratings protect against dust and water jets
  • Metal head and bezel withstand heavy industrial use

Industrial Mushroom-Head Operator

The Schneider Electric ZB4BS55 is a 22 mm yellow mushroom-head push button designed for industrial control panels. Its maintained action keeps the circuit in the selected position until pressed again. Metal construction throughout the head, bezel and base material suits harsh environments where plastic operators could degrade. Panel builders and maintenance engineers specify it for emergency-stop or manual-override stations.

Environmental Ratings Define Installation Limits

The operator carries NEMA 1, 2, 3, 4, 4X and 13 ratings alongside an IP66 ingress-protection class. These standards certify resistance to falling dirt, dripping water, hose-directed spray, corrosion and oil or coolant seepage. Compliance with IEC 60529, IEC 60068-2-6 and IEC 60068-2-27 confirms suitability for vibration and shock-prone machinery. Installations requiring higher-pressure wash-down or submersion fall outside the certified envelope.

Forty-Millimetre Head Balances Visibility

The 40 mm mushroom diameter provides a large, colour-coded target that operators can locate quickly in low light or while wearing gloves. Yellow coding conventionally signals caution or manual-reset functions rather than immediate emergency stop. The maintained mechanism suits processes that need a latched state without continuous pressure. Applications demanding momentary action, smaller cut-outs or different colour codes require a different operator type.

Highlights

  • 22 mm mounting fits standard panels
  • Yellow mushroom head gives high visibility
  • Maintained action holds position until reset
  • IP66 and NEMA 4X ratings protect against dust and water jets
  • Metal head and bezel withstand heavy industrial use

Specifications

BrandSCHNEIDER ELECTRIC
TypeIndustrial Electrical Controls & Automation
Size22 mm

Questions about this item

Should I choose the 40 mm yellow mushroom head or a different operator size for my 22 mm panel cutout?

This operator is a 40 mm mushroom head made for a 22 mm mounting hole. No other head diameters are offered for this part number.

What does the IP66 rating mean when the button is installed in a metal enclosure?

IP66 confirms the head is dust-tight and protected against powerful water jets when correctly mounted in a panel rated to the same level.

Which standards govern the 22 mm mounting interface and the NEMA 4X rating?

The 22 mm cutout follows IEC 60947-5-1; NEMA 1, 2, 3, 4, 4X and 13 are covered by UL 508 and CSA C22.2 No. 14.

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