Schneider Electric ZB5AA331 Green Flush Push-Button Head, I

ZB5AA331: green flush push-button head, marked I

The ZB5AA331 is a Schneider Electric Harmony XB5 operator head for a 22 mm panel hole: a green flush push-button head marked I with a dark grey plastic bezel. Seven Star LLC supplies the ZB5AA331 in Oman and the GCC as an independent supplier based in Muscat, usually to panel builders and maintenance stores completing a Harmony XB5 station.

The datasheet describes this reference as a head only, listed as a basic element: the electrical blocks that do the switching are separate parts clipped behind the panel. The device short name is ZB5, and the datasheet title reads “Push button head, plastic, flush, green, Ø22, spring return, marked I”.

Technical specifications of the ZB5AA331

Where ZB5AA331 sits among its siblings

These references share the 22 mm bezel and the Harmony XB5 mounting, and differ in colour, marking, action and whether the head is illuminated. Choose by function first, then by colour and marking.

Typical uses in Oman and the GCC

Operator heads of this kind are found on motor control stations, pump and fan starters, water treatment skids and packaged machinery throughout the region. In oil and gas and petrochemical sites they appear on local control panels and auxiliary cabinets; in power and desalination plants they sit on switchgear doors and local stations. Heat, dust and wash-down are the usual stresses, and the datasheet sealing ratings are what make the ZB5AA331 suitable for them when the panel hole is cut cleanly.

Selection checklist and RFQ information for ZB5AA331

Send the points below so that the part number can be confirmed against the datasheet and checked for availability in one reply.

• Part number ZB5AA331 and the required quantity.
• The operator colour, marking and action you need, checked against your project legend.
• The contact blocks you plan to fit behind it, and the number of NO and NC contacts needed.
• Panel thickness and the position of the lug recess in the hole.
• Rear clearance behind the panel, including the blocks.
• Any approval needed by the project, compared with the datasheet list.
• Delivery location in Oman or the GCC and the lead time you need.

Colour, marking and typical duty of ZB5AA331

Green with a white I is the classic start marking: green says run or go, and the I symbol is the IEC sign for on. The two together let an operator find the start button on a busy station without reading a nameplate.

Typical duty is the start button of a motor starter, pump or conveyor, wired through a normally open contact block to a contactor coil or a PLC input. Paired with the red head marked O (ZB5AA432 in the same lane), it forms a complete start and stop pair.

Panel cut-out and mounting for ZB5AA331 and sealing

The datasheet specifies the panel hole as 22.5 mm recommended, with a finished-hole tolerance written as 22.3 mm plus 0.4 mm. For connection by screw clamp terminals or plug-in connectors it asks for a fixing centre of at least 40 × 30 mm, for Faston connectors 45 × 32 mm and for printed-circuit-board connection 30 × 30 mm. Selector and emergency-stop heads call for an anti-rotation plate in the datasheet drawings, while flush push-button heads are normally held by the lug recess and collar alone.

Overall dimensions are 29 mm wide, 29 mm high and 28 mm deep before the blocks are added, and the head weighs 0.018 kg. Remember to add the depth of the blocks you choose when checking door clearance.

The datasheet lists protection of IP66, IP67, IP69, IP69K, an impact rating of IK03, and UL type 4X/13 enclosure use. The datasheet also quotes resistance to a high-pressure washer of 7000000 Pa at 55 °C from a distance of 0.1 m.

Operating and storage temperatures are listed in the table, and the datasheet shows approvals of DNV, CSA, BV, LROS (Lloyd’s Register), UL listed. Accept a marine or UL requirement for the ZB5AA331 only where it appears in that list, because blocks and other parts of the station may carry different approvals.

Operation and contact-block combinations

The ZB5AA331 is a spring return operator, with a stated mechanical durability of 10000000 cycles. It has no contacts of its own. The electrical composition codes in the datasheet (C1, C2, C11, C15, SF1, SR1) tell you how many single or double blocks can be stacked behind the head: for example the datasheet gives C1 as fewer than nine contacts using single blocks in front mounting, so the head is not the limiting part of a multi-contact station.

Front and rear mounting codes (SF1 and SR1) are also listed, which means the same head can be used with blocks mounted from the front of the panel or from the rear, depending on the enclosure design.

Installation and maintenance notes

Fit the head from the front, drop it into the hole so the lug engages the recess, and clamp it from behind with the fixing collar before adding the blocks. After wiring, operate the this unit through its whole stroke and confirm each block changes state at the point you expect. During maintenance, wipe the lens or cap, check that the bezel seals evenly against the panel, and keep a spare head or block on the shelf because the heads and blocks are separately ordered parts.

Documents and quotation

The Schneider Electric datasheet for the ZB5AA331 is attached on this page for your technical file. It holds the data summarised above together with panel cut-out and dimension drawings.

To request a quotation, send the part number and quantity through the enquiry form and we will reply with availability and delivery terms. Seven Star LLC is an independent supplier and does not act for the manufacturer, so please check the datasheet against your project requirements before ordering.