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Harmony XB4 & XB5 Emergency Stop Push Buttons

Schneider Electric Harmony XB4 and XB5 Emergency Stop Push Buttons offer 40mm mushroom heads and operate with a latched push-pull, turn release, or key release mechanism. These push buttons feature a robust metal or plastic bezel, depending on the model. Emergency Machine Stop (EMS) and Emergency Off (EO) push buttons are easily installed into a standard 22mm diameter cutout and connected with simple screw-clamp connections. These push buttons are clearly visible at a distance due to the clear color and prominent 30mm, 40mm, or 60mm mushroom shapes. Due to the IP66 rating, these push buttons are impact-, dust-, water-, and vibration-resistant, making them ideal for operation in even the most demanding environments. Schneider Electric Harmony XB4 and XB5 Emergency Stop Push Buttons are compatible for installation with XALK and XAPK yellow lid control stations.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (USD) Filter the results in the table by unit price based on your quantity.	Qty.
Emergency Stop Switches / E-Stop Switches TRIGGER E-STOP XB4BS8444 Schneider Electric 1: $80.85 A tariff of 8% may be applied if shipping to the United States. 225In Stock	Mfr. Part # XB4BS8444 Mouser Part # 996-XB4BS8444	Schneider Electric	Emergency Stop Switches / E-Stop Switches TRIGGER E-STOP Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	225In Stock	$80.85 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches PUSHBUTTON OPERATOR 22MM XB4B XB4BS8445 Schneider Electric 1: $121.28 A tariff of 8% may be applied if shipping to the United States. 212In Stock	Mfr. Part # XB4BS8445 Mouser Part # 996-XB4BS8445	Schneider Electric	Emergency Stop Switches / E-Stop Switches PUSHBUTTON OPERATOR 22MM XB4B Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	212In Stock	$121.28 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Control Stations EMERGENCY STOP CONT. BOX XALK178F Schneider Electric 1: $181.55 A tariff of 8% may be applied if shipping to the United States. 36In Stock 2Expected 12/2/2026	Mfr. Part # XALK178F Mouser Part # 996-XALK178F	Schneider Electric	Control Stations EMERGENCY STOP CONT. BOX Learn More about Schneider Electric schneider 22mm enclosed control stations	Datasheet	36In Stock 2Expected 12/2/2026	$181.55 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Control Stations PUSH BUTTON ENCLSR 600VAC 10A XALB SP XALK178H7 Schneider Electric 1: $134.87 A tariff of 8% may be applied if shipping to the United States. 25In Stock	Mfr. Part # XALK178H7 Mouser Part # 996-XALK178H7	Schneider Electric	Control Stations PUSH BUTTON ENCLSR 600VAC 10A XALB SP Learn More about Schneider Electric schneider 22mm enclosed control stations	Datasheet	25In Stock	$134.87 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches D40 EMERGENCY STOP TTR HEAD XB4BS8442 Schneider Electric 1: $91.51 A tariff of 8% may be applied if shipping to the United States. 63In Stock 48Expected 11/30/2026	Mfr. Part # XB4BS8442 Mouser Part # 996-XB4BS8442	Schneider Electric	Emergency Stop Switches / E-Stop Switches D40 EMERGENCY STOP TTR HEAD Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	63In Stock 48Expected 11/30/2026	$91.51 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches TRIGGER E-STOP W/CB'S XB4BS84441 Schneider Electric 1: $135.24 A tariff of 8% may be applied if shipping to the United States. 34In Stock	Mfr. Part # XB4BS84441 Mouser Part # 996-XB4BS84441	Schneider Electric	Emergency Stop Switches / E-Stop Switches TRIGGER E-STOP W/CB'S Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	34In Stock	$135.24 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches E.stop PB plastic red mushr turn 1NC XB5AS8442 Schneider Electric 1: $91.51 A tariff of 8% may be applied if shipping to the United States. 94In Stock	Mfr. Part # XB5AS8442 Mouser Part # 996-XB5AS8442	Schneider Electric	Emergency Stop Switches / E-Stop Switches E.stop PB plastic red mushr turn 1NC Learn More about Schneider Electric schneider xb5 zb5 plastic control signaling units	Datasheet	94In Stock	$91.51 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches E-STOP TTR W/ 2NC E-STOP TTR W/ 2NC XB5AS8444 Schneider Electric 1: $121.29 A tariff of 8% may be applied if shipping to the United States. 33In Stock	Mfr. Part # XB5AS8444 Mouser Part # 996-XB5AS8444	Schneider Electric	Emergency Stop Switches / E-Stop Switches E-STOP TTR W/ 2NC E-STOP TTR W/ 2NC Learn More about Schneider Electric schneider xb5 zb5 plastic control signaling units	Datasheet	33In Stock	$121.29 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches E-STOP TTR W/ 1 NO & NC XB5AS8445 Schneider Electric 1: $121.28 A tariff of 8% may be applied if shipping to the United States. 27In Stock	Mfr. Part # XB5AS8445 Mouser Part # 996-XB5AS8445	Schneider Electric	Emergency Stop Switches / E-Stop Switches E-STOP TTR W/ 1 NO & NC Learn More about Schneider Electric schneider xb5 zb5 plastic control signaling units	Datasheet	27In Stock	$121.28 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Actuators MUSHROOM PB ZB4BS844 Schneider Electric 1: $67.99 A tariff of 8% may be applied if shipping to the United States. 248In Stock 231Expected 11/27/2026	Mfr. Part # ZB4BS844 Mouser Part # 996-ZB4BS844	Schneider Electric	Switch Actuators MUSHROOM PB Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	248In Stock 231Expected 11/27/2026	$67.99 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Actuators PUSHBUTTON MUSHROOM HEAD 22MM XB4 ZB4BS84430 Schneider Electric 1: $68.91 A tariff of 8% may be applied if shipping to the United States. 752In Stock	Mfr. Part # ZB4BS84430 Mouser Part # 996-ZB4BS84430	Schneider Electric	Switch Actuators PUSHBUTTON MUSHROOM HEAD 22MM XB4 Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	752In Stock	$68.91 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Actuators TRIGGER ACTION TURN TO RELEASE 40MM RED ZB5AS844 Schneider Electric 1: $67.99 A tariff of 8% may be applied if shipping to the United States. 257In Stock	Mfr. Part # ZB5AS844 Mouser Part # 996-ZB5AS844	Schneider Electric	Switch Actuators TRIGGER ACTION TURN TO RELEASE 40MM RED Learn More about Schneider Electric schneider xb5 zb5 plastic control signaling units	Datasheet	257In Stock	$67.99 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Contact Blocks / Switch Kits N/O CONTACT BLOCK ZBE101 Schneider Electric 1: $12.05 A tariff of 8% may be applied if shipping to the United States. 2,856In Stock 1,785Expected 11/23/2026	Mfr. Part # ZBE101 Mouser Part # 996-ZBE101	Schneider Electric	Switch Contact Blocks / Switch Kits N/O CONTACT BLOCK Learn More about Schneider Electric schneider harmony e stop push buttons	Datasheet	2,856In Stock 1,785Expected 11/23/2026	$12.05 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Contact Blocks / Switch Kits N/C CONTACT BLOCK ZBE102 Schneider Electric 1: $12.05 A tariff of 8% may be applied if shipping to the United States. 2,685In Stock 328On Order	Mfr. Part # ZBE102 Mouser Part # 996-ZBE102	Schneider Electric	Switch Contact Blocks / Switch Kits N/C CONTACT BLOCK Learn More about Schneider Electric schneider harmony e stop push buttons	Datasheet	2,685In Stock 328On Order	$12.05 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches D40 EMERGENCY STOP KR 455E XB4BS9442 Schneider Electric 1: $140.38 A tariff of 8% may be applied if shipping to the United States. 3In Stock	Mfr. Part # XB4BS9442 Mouser Part # 996-XB4BS9442	Schneider Electric	Emergency Stop Switches / E-Stop Switches D40 EMERGENCY STOP KR 455E Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	3In Stock	$140.38 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Keylock Switches PUSHBUTTON OPERATOR 22MM XB4B XB4BS9445 Schneider Electric 1: $122.69 A tariff of 8% may be applied if shipping to the United States. 13In Stock	Mfr. Part # XB4BS9445 Mouser Part # 996-XB4BS9445	Schneider Electric	Keylock Switches PUSHBUTTON OPERATOR 22MM XB4B Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	13In Stock	$122.69 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches PUSHBUTTON OPERATOR 22MM XB4B XB4BT845 Schneider Electric 1: $74.24 A tariff of 8% may be applied if shipping to the United States. 18In Stock	Mfr. Part # XB4BT845 Mouser Part # 996-XB4BT845	Schneider Electric	Emergency Stop Switches / E-Stop Switches PUSHBUTTON OPERATOR 22MM XB4B Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	18In Stock	$74.24 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches PUSHBUTTON 230VAC 2AMP XB5 XB5AS9445 Schneider Electric 1: $121.28 A tariff of 8% may be applied if shipping to the United States. 12In Stock	Mfr. Part # XB5AS9445 Mouser Part # 996-XB5AS9445	Schneider Electric	Emergency Stop Switches / E-Stop Switches PUSHBUTTON 230VAC 2AMP XB5 Learn More about Schneider Electric schneider xb5 zb5 plastic control signaling units	Datasheet	12In Stock	$121.28 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches E.stop PB plastic red mushr pull 1NC XB5AT842 Schneider Electric 1: $58.43 A tariff of 8% may be applied if shipping to the United States. 25In Stock	Mfr. Part # XB5AT842 Mouser Part # 996-XB5AT842	Schneider Electric	Emergency Stop Switches / E-Stop Switches E.stop PB plastic red mushr pull 1NC Learn More about Schneider Electric schneider xb5 zb5 plastic control signaling units	Datasheet	25In Stock	$58.43 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Actuators TRIGGER ACTION KEY RELEASE 60MM RED ZB5AS964 Schneider Electric 1: $83.98 A tariff of 8% may be applied if shipping to the United States. 10In Stock	Mfr. Part # ZB5AS964 Mouser Part # 996-ZB5AS964	Schneider Electric	Switch Actuators TRIGGER ACTION KEY RELEASE 60MM RED Learn More about Schneider Electric schneider xb5 zb5 plastic control signaling units	Datasheet	10In Stock	$83.98 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Actuators MUSHROOM PB OPERATOR ZB4BS834 Schneider Electric 1: $66.52 A tariff of 8% may be applied if shipping to the United States. 75In Stock	Mfr. Part # ZB4BS834 Mouser Part # 996-ZB4BS834	Schneider Electric	Switch Actuators MUSHROOM PB OPERATOR Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	75In Stock	$66.52 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Actuators MUSHROOM PB ZB4BS944 Schneider Electric 1: $112.52 A tariff of 8% may be applied if shipping to the United States. 15In Stock	Mfr. Part # ZB4BS944 Mouser Part # 996-ZB4BS944	Schneider Electric	Switch Actuators MUSHROOM PB Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	15In Stock	$112.52 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Actuators MUSHROOM PB ZB4BT84 Schneider Electric 1: $36.53 A tariff of 8% may be applied if shipping to the United States. 116In Stock	Mfr. Part # ZB4BT84 Mouser Part # 996-ZB4BT84	Schneider Electric	Switch Actuators MUSHROOM PB Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	116In Stock	$36.53 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Emergency Stop Switches / E-Stop Switches E.stop PB metal red mushr pull 1NC XB4BT842 Schneider Electric 1: $58.43 A tariff of 8% may be applied if shipping to the United States. 2In Stock 109On Order	Mfr. Part # XB4BT842 Mouser Part # 996-XB4BT842	Schneider Electric	Emergency Stop Switches / E-Stop Switches E.stop PB metal red mushr pull 1NC Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	2In Stock 109On Order On Order Ship Dates Mfr. #: XB4BT842 Stock: 2 Can Ship Immediately On Order: 12 Expected 11/23/2026 97 Expected 11/30/2026 Factory Lead-Time: 3 Weeks	$58.43 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1
Switch Actuators TRIGGER ACTION TURN TO RELEASE 30MM RED ZB5AS834 Schneider Electric 1: $67.99 A tariff of 8% may be applied if shipping to the United States. 11In Stock	Mfr. Part # ZB5AS834 Mouser Part # 996-ZB5AS834	Schneider Electric	Switch Actuators TRIGGER ACTION TURN TO RELEASE 30MM RED Learn More about Schneider Electric schneider xb5 zb5 plastic control signaling units	Datasheet	11In Stock	$67.99 A tariff of 8% may be applied if shipping to the United States.	Min.: 1 Mult.: 1