Schneider XB4BS8444 Emergency Stop Button, Harmony XB4, Metal, Red Mushroom

The Schneider Electric XB4BS8444 is a red mushroom-head emergency stop button from the Harmony XB4 series, featuring a 40 mm actuator with twist-to-release reset and 2NC contact configuration. Designed for 22.5 mm panel cutouts with a chrome metal body, it provides positive opening action per IEC 60947-5-1 Annex K for reliable safety circuit performance.

Technical specifications:

• Commercial reference: XB4BS8444
• Manufacturer: Schneider Electric
• EAN:
• Series / range: Harmony XB4
• Product type: Emergency stop button
• Actuator: Red mushroom head, 40 mm diameter, unmarked
• Mounting diameter: 22.5 mm
• Body material: Chrome metal
• Reset action: Twist-to-release
• Contact type: 2NC (normally closed)
• Contact operation: Slow break
• Travel (NC state change): 1.5 mm
• Total travel: 4.3 mm
• Rated insulation voltage [Ui]: 600 V (pollution degree 3), per IEC 60947-1
• Rated impulse withstand voltage [Uimp]: 6 kV, per IEC 60947-1
• Rated operational current [Ie]: 3 A at 240 V AC-15; 6 A at 120 V AC-15; 0.1 A at 600 V DC-13
• Short-circuit protection: 10 A gG fuse, per IEC 60947-5-1
• Thermal current [Ith]: 10 A, per IEC 60947-5-1
• Mechanical durability: 300,000 cycles
• Electrical durability: 1,000,000 cycles
• Contact material: Silver alloy (Ag/Ni)
• Connection: Screw terminals, up to 2 x 1.5 mm² (with ferrule) or 1 x 0.22 mm² (without ferrule)
• Tightening torque: 0.8 to 1.2 N.m, per IEC 60947-1
• IP protection: IP66, IP67, IP69, IP69K per IEC 60529
• NEMA rating: NEMA 4X, NEMA 13
• Impact protection: IK06 per IEC 50102
• Operating temperature: -40 to 70 °C
• Storage temperature: -40 to 70 °C
• Vibration resistance: 5 gn (2 to 500 Hz), per IEC 60068-2-6
• Shock resistance: 30 gn (18 ms) and 50 gn (11 ms), per IEC 60068-2-27
• Dimensions (WxHxD): 40 x 47 x 82 mm
• Weight: 0.13 kg
• Certifications: UL, CSA, BV, DNV, LROS (Lloyd's Register of Shipping)

Features and benefits:

• Positive opening action per IEC 60947-5-1 Annex K ensures contact separation even under spring failure conditions
• Twist-to-release reset prevents accidental restart without deliberate operator action
• IP66/IP67/IP69K sealing and chrome metal body provide reliable protection against water jets, dust, and high-pressure washdowns at 55 °C
• Wide temperature range (-40 to 70 °C) supports operation in demanding industrial environments
• Multiple international certifications (UL, CSA, DNV, BV, LROS) support global deployment across regulated industries

Applications:

• Emergency stop circuits on industrial machinery and production lines
• Safety panels in food and beverage processing where high-pressure washdown is required
• Marine and offshore control panels requiring DNV or Lloyd's Register certification
• Outdoor or harsh-environment control enclosures requiring IP69K protection

Compliant with IEC 60947-5-1, IEC 60947-5-5, IEC 60947-1, ISO 13850, IEC 60204-1, UL 508, CSA C22.2 No 14, and JIS C8201-5-1. Part of the Schneider Electric Harmony XB4 range.

Also known as: Schneider XB4BS8444, Schneider Electric XB4BS8444, Harmony XB4 emergency stop mushroom button, 22mm emergency stop button twist release.