Schneider Electric XB7NA35 XB7 Green Push Button

XB7NA35: XB7 green push button for 22 mm panels

The XB7NA35 is a Schneider Electric Harmony XB7 push button: a green flush push button that carries one normally open and one normally closed contact in the same monolithic body. Seven Star LLC supplies the XB7NA35 in Oman and the GCC as an independent supplier based in Muscat, usually to panel builders, maintenance stores and contractors who need a compact plastic operator that mounts in a standard 22 mm hole.

The datasheet carries no ordering-code table, so the following reading of the reference is our interpretation from the catalogue title only: XB7 is the plastic monolithic range, the next letters describe the operator family, and the title confirms the colour, the operator action and the contact composition (1 NO + 1 NC). The XB7 construction is monolithic, meaning the operator and the contact element are one unit and are not separated into a head and a block.

Technical specifications of the XB7NA35

Selection checklist for the XB7NA35

• Colour and meaning: confirm that the colour matches your panel convention.
• Contacts: match NO, NC or both to the circuit logic and to the number of controller inputs.
• Action: spring-return momentary operator.
• Mounting: 22 mm hole, panel thickness within the listed range.
• Load: low-current control signals only, within the 0.1–1.5 A ratings listed.
• Environment: IP65 front face; panel temperature within -25 to 70 °C.

Typical uses of the XB7NA35 in Oman and the GCC

This device is used as a start button that must also isolate a rival circuit, such as forward and reverse interlocking on a conveyor or a hoist control. Typical sites are pump stations, water and desalination utilities, workshops, packaging and material-handling lines, and small plant panels in oil and gas support facilities. In Gulf conditions the monolithic plastic body works best in air-conditioned control rooms or well-sealed outdoor panels, since fine dust and high summer cabinet temperatures can shorten the life of any operator.

Check the panel gasket and cable entries when the XB7NA35 is placed in an outdoor enclosure, and avoid direct sun on the front face. For wash-down or marine duty, a higher-rated metal head from a different range would be the safer choice.

Comparison of the XB7NA35 with sibling XB7 references

The nine references above share the same 22 mm body and terminal style. They differ in operator type and contact composition, which is what decides the circuit the device can build: a single NO makes one circuit, a NO plus NC both makes and breaks, and a NC alone only breaks.

Contact arrangement of the XB7NA35

Terminals 13-14 give the NO contact and 21-22 the NC contact. Pressing the button closes the first and opens the second at the same moment, which is the classic arrangement for interlocking: the start button also breaks a competing circuit, such as the opposite direction of a reversing starter. For this reference the datasheet states positive opening on the NC contact according to IEC 60947-5-1 appendix K, meaning the contact is forced open by the operator travel even if its contacts weld.

Contact operation is slow-break and the mechanical life is stated as 1,000,000 cycles. Electrical durability is quoted at 1 000 000 cycles for the listed duty points, for example 0.3 A at 24 V DC-13, so a small signal load such as a relay coil or a PLC input is well inside the rating. Short-circuit protection of the contacts is given as a 4 A gG fuse, which should be present in the circuit feeding this device.

XB7NA35 operator, body and panel fixing

The operator is a flush round cap that returns by spring after each press. The body is 51.5 mm deep and 29 mm across the head, and the unit weighs 0.021 kg. It mounts in a 22.5 mm hole using a fixing nut tightened to 2–2.4 N.m, with panel thickness of 1–6 mm for metal or 2–6 mm for plastic.

The front face is rated IP65 and the rear face IP20, and the UL enclosure type is 3/12. Rear-side terminals are therefore for use inside a closed enclosure. The datasheet lists an operating range of -25 to 70 °C, so check the real panel heat load before specifying this plastic series for sun-exposed locations.

Installation, wiring and maintenance of the XB7NA35

Drill the panel to 22.5 mm, drop the XB7NA35 in from the front and tighten the fixing nut from behind to the 2–2.4 N.m range. Wire the screw clamp terminals at 0.8–1.2 N.m; with cable ends the terminal accepts up to two 1.5 mm² conductors, and without cable ends it accepts conductors from 0.34 to 2.5 mm². A Pozidriv, Phillips or JIS cross driver of size 1 or a flat 4 or 5.5 mm blade fits the screw head.

After wiring, press or turn the operator through every position with a multimeter on the terminals, and confirm that the contact state matches the circuit drawing. Label the front of the panel so that the function is visible to the operator. Keep spare units of this unit for critical control stations, and replace the device if the operator feels sticky or a contact reads unstable.

Information to send with an RFQ for the XB7NA35

• Exact reference XB7NA35 and quantity.
• Panel hole size and thickness.
• Required colour, contact set and operator action.
• Control voltage and expected current.
• Delivery location and project schedule.

Documents and quotation

The manufacturer datasheet for the XB7NA35 is attached on this page and carries the data summarised above. Compare its revision against your project requirement before ordering.

Send us the reference XB7NA35, the quantity and your delivery location, and Seven Star LLC, an independent supplier in Muscat, will reply to your request.