Schneider Electric XB6AS8349B XB6 Emergency Stop 16 mm 1NO+2NC

XB6AS8349B: XB6 emergency stop with 30 mm red mushroom head

The XB6AS8349B is a Schneider Electric Harmony XB6 complete emergency stop push-button for a 16 mm panel hole. It has a 30 mm unmarked red mushroom head, trigger action with mechanical latching, turn-to-release reset and a contact block of one normally open and two normally closed contacts. Seven Star LLC supplies the XB6AS8349B in Oman and the GCC as an independent supplier based in Muscat.

The 16 mm size is the smaller XB6 format, used on compact panels, pendant stations and equipment where a 22 mm hole would be too large. The word complete in the datasheet title means the head and the contact block are supplied together as one reference, which avoids ordering separate parts.

Electrical ratings of the XB6AS8349B

The contacts are silver alloy (Ag/Ni). Rated operational currents are 3 A at 120 V and 1.5 A at 240 V in AC-15, and 0.22 A at 125 V and 0.1 A at 250 V in DC-13. A 6 A gG cartridge fuse is required for short-circuit protection. Insulation voltage is 250 V at pollution degree 3 and the impulse withstand is 4 kV. Electrical durability is 1000000 cycles at 230 V in AC-15 and DC-13.

The electrical reliability figure of 10 to the minus 8 at 5 V and 1 mA indicates suitability for low-level signal circuits, so the XB6AS8349B can feed a safety relay or PLC input directly. Connections are Faston tabs of 2.8 × 0.5 mm.

Latching and contact action of the XB6AS8349B

Pushing the mushroom head latches it down mechanically and opens the two normally closed contacts, which are marked (21-22) and (31-32), while the normally open contact (13-14) closes. The head stays down until it is turned to release. The datasheet lists positive opening to IEC 60947-5-1 appendix K, meaning the operator itself forces the NC contacts open, so a welded contact cannot keep the circuit closed.

The travel figures show the sequence: the NC contacts change after 1 mm, the NO contact after 2 mm, and the total stroke is 3.5 mm. The operating force at the change points is 3.5 N for the NO contact and 4.5 N for the NC contacts. Mechanical durability is 100000 cycles, a figure suited to a device that is operated rarely.

Selection checklist and RFQ information for XB6AS8349B

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

• Part number XB6AS8349B and quantity, in multiples of 1.
• Contact arrangement required: this device has 1 NO + 2 NC.
• Circuit voltage and current of the stop loop and the safety relay used.
• Panel thickness, hole size (16 mm) and rear depth on the door.
• Any safety standard or certificate that must be shown, compared with the datasheet.
• Delivery location in Oman or the GCC and the lead time you need.

Where XB6AS8349B is used in Oman and the GCC

A compact emergency stop like XB6AS8349B suits portable control pendants, small machine panels, packaged skids, conveyors, workshop equipment and lifting aids in Oman and the GCC. Because the head is a mushroom of 30 mm and the hole only 16 mm, it works where space is limited but a clear stop target is still required.

In hot and dusty plants, mount it within easy reach, keep the head visible and tested, and inspect the latch periodically as part of the maintenance plan.

Mounting and environment of the XB6AS8349B

The this unit mounts in a 16 mm hole; the dimension drawing gives a panel thickness range of 1 to 6 mm. The head measures 30 mm across, and the overall depth is 77 mm, so check the rear clearance on a shallow door. The body weighs 0.041 kg. The datasheet gives IP65 for the front, UL and CSA NEMA 4, 4X and 13 equivalents where listed, operation from -25 to 70 °C and storage from -40 to 70 °C. Shock resistance is 30 gn for 18 ms and 50 gn for 11 ms.

The mounting position is any. IP65 applies to the front when the panel seal is in good order; the rear Faston terminals must be protected inside an enclosure.

Emergency stop standards and limits of the XB6AS8349B

Among the standards named on the datasheet are IEC 60947-5-5, IEC 60204-1 and ISO 13850, the three references that govern emergency stop devices and their use on machines, as well as IEC 60947-5-1, UL 508 and CSA C22.2 No 14. The datasheet does not state a performance level or a safety-integrity rating, so the machine builder must show that the arrangement meets the risk assessment, normally by monitoring the NC contacts with a safety relay.

Use the second NC contact for redundancy or for a separate circuit, and the NO contact for a status signal to a controller. Certifications listed are CSA, CCC, GOST and UL.

Technical specifications of the XB6AS8349B

Documents and quotation

The Schneider Electric datasheet for the XB6AS8349B 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.