Schneider Electric XB7ES542P XB7 Emergency Stop 22 mm 1NC

XB7ES542P: XB7 22 mm emergency stop with 40 mm mushroom head

The XB7ES542P is a Schneider Electric Harmony XB7 monolithic emergency switching-off push-button for a 22 mm panel hole. It has a red mushroom head of 40 mm, mechanical latching with turn-to-release reset, and a single normally closed contact with positive opening. Seven Star LLC supplies the XB7ES542P in Oman and the GCC as an independent supplier based in Muscat.

It is a device with one NC contact and nothing else: there is no NO contact for a status signal, so a design that must feed back the stop state to a PLC needs a second device or a different reference.

How the XB7ES542P operates

Pressing the head latches it down mechanically and opens the NC contact; the head stays down until it is turned to release. The datasheet gives a slow-break contact with positive opening to IEC 60947-5-1 appendix K, which means the contact is driven open by the operator itself rather than relying on a spring, so a welded contact cannot hold the circuit closed against the push. Mechanical durability is stated as 10000 cycles, which is appropriate for an emergency device that is operated rarely.

The rated currents are small, 0.6 A at 120 V AC-14 and 0.3 A at 240 V AC-14, so the contact normally sits in a control or safety-relay circuit rather than carrying contactor coil current directly; the datasheet requires a 4 A gG fuse for short-circuit protection. Electrical reliability is given as a failure rate below 10 to the minus 6 at 17 V and 5 mA, which tells you it is suitable for low-level signal circuits.

Typical uses of XB7ES542P in Oman and the GCC

A single-contact emergency stop such as XB7ES542P suits local control stations, pump and fan starters, conveyor controls, workshop machines and packaged skids across Oman and the GCC. Plant electricians use it as the front end of a safety relay chain, where a second contact is not needed and the compact 22 mm monolithic body keeps the station small.

For dusty or hot outdoor sites, house it in a rated enclosure and verify the temperature inside against the stated range.

Mounting and wiring of the XB7ES542P

The this unit fits a 22.5 mm round hole with a clamping thickness of 1 to 6 mm on metal or 2 to 6 mm on plastic, with a minimum spacing of 30 × 40 mm between fixing centres. The fixing nut under the head is tightened to 2–2.4 N.m and the terminal screws to 0.8–1.2 N.m. The overall envelope is 40 × 40 × 72 mm and the weight is 0.032 kg; allow room behind the door and between adjacent heads because the 40 mm mushroom is wider than a standard button.

Wire to the NC terminals marked (11-12) with up to two 1.5 mm² conductors with ends, or one 0.34 mm² up to two 2.5 mm² without ends. The screws take Phillips, Pozidriv, JIS and flat drivers of 4 or 5.5 mm.

Technical specifications of the XB7ES542P

Emergency stop duty and standards for the XB7ES542P

The standards named in the datasheet include IEC 60947-5-1, UL 508, IEC 60947-1, CSA C22.2 No 14 and IEC 60364-5-53. The datasheet does not list a safety-integrity rating for this device, a performance level or a notified-body certificate, so its use in a safety function must be justified by the machine builder’s own risk assessment, with the contact monitored by a suitable relay or controller.

Practical points: mount the this unit where it is reachable at all times, keep its colour (red on yellow background is the common plate) and legend clear, and test the latch and contact regularly as part of the site maintenance plan. The only certification mark listed is CCC.

Environment and sealing of the XB7ES542P

The front face is IP54 and the rear IP20, with UL type 12 and electrical shock protection class II. Operation is rated from -25 to 70 °C and storage from -40 to 70 °C. Vibration resistance is 5 gn between 2 and 500 Hz and shock 10 gn for 11 ms, which is a lower shock figure than the XB7 push buttons and lamps, so heavy-shock machinery should be checked against this limit.

Because the rear face is not sealed, the this unit belongs inside an enclosure; on outdoor equipment use it in a closed, ventilated cabinet and consider a protective cover on the head against dust and sand.

Selecting between emergency stop references like the XB7ES542P

Compare the contact arrangement first: the XB7ES542P has 1 NC only. Then check head size (here 40 mm), release method (turn), mounting diameter (22 mm), and whether you need a key release, extra contacts or a higher protection class. A buyer who needs more contacts should state the arrangement in the enquiry rather than adding blocks after delivery; the datasheet for this monolithic device lists no add-on contact blocks. Also confirm the sales quantity of 10.

Selection checklist and RFQ information for XB7ES542P

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

• Part number XB7ES542P and quantity, in multiples of 10.
• The contact arrangement you need (this device has 1 NC only).
• The circuit voltage and current of the stop loop.
• Panel thickness, door depth and spacing around the 40 mm head.
• Enclosure rating and operating temperature on site.
• Any safety standard or certificate that must be shown, to compare with the datasheet.
• Delivery location in Oman or the GCC and the lead time you need.

Documents and quotation

The Schneider Electric datasheet for the XB7ES542P is attached on this page for your technical file. It holds the electrical, mechanical and environmental data summarised above, together with the dimension and panel cut-out 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.