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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.	Product Type	Type	Contact Form	Switch Function	Mounting Style
Emergency Stop Switches / E-Stop Switches TRIGGER E-STOP XB4BS8444 Schneider Electric 1: $80.85 249In Stock	Mfr. Part No. XB4BS8444 Mouser Part No 996-XB4BS8444	Schneider Electric	Emergency Stop Switches / E-Stop Switches TRIGGER E-STOP Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	249In Stock	$80.85	Min.: 1 Mult.: 1	Emergency Stop Switches				Panel Mount
Emergency Stop Switches / E-Stop Switches PUSHBUTTON OPERATOR 22MM XB4B XB4BS8445 Schneider Electric 1: $121.28 230In Stock	Mfr. Part No. XB4BS8445 Mouser Part No 996-XB4BS8445	Schneider Electric	Emergency Stop Switches / E-Stop Switches PUSHBUTTON OPERATOR 22MM XB4B Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	230In Stock	$121.28	Min.: 1 Mult.: 1	Emergency Stop Switches		SPDT	ON - ON	Panel Mount
Control Stations EMERGENCY STOP CONT. BOX XALK178F Schneider Electric 1: $181.55 29In Stock 9Expected 02/11/2026	Mfr. Part No. XALK178F Mouser Part No 996-XALK178F	Schneider Electric	Control Stations EMERGENCY STOP CONT. BOX Learn More about Schneider Electric schneider 22mm enclosed control stations	Datasheet	29In Stock 9Expected 02/11/2026	$181.55	Min.: 1 Mult.: 1		Control Station
Control Stations PUSH BUTTON ENCLSR 600VAC 10A XALB SP XALK178H7 Schneider Electric 1: $134.87 25In Stock	Mfr. Part No. XALK178H7 Mouser Part No 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	Min.: 1 Mult.: 1		Control Station
Emergency Stop Switches / E-Stop Switches D40 EMERGENCY STOP TTR HEAD XB4BS8442 Schneider Electric 1: $91.51 83In Stock	Mfr. Part No. XB4BS8442 Mouser Part No 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	83In Stock	$91.51	Min.: 1 Mult.: 1	Emergency Stop Switches
Emergency Stop Switches / E-Stop Switches TRIGGER E-STOP W/CB'S XB4BS84441 Schneider Electric 1: $135.24 35In Stock	Mfr. Part No. XB4BS84441 Mouser Part No 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	35In Stock	$135.24	Min.: 1 Mult.: 1	Emergency Stop Switches
Emergency Stop Switches / E-Stop Switches E.stop PB plastic red mushr turn 1NC XB5AS8442 Schneider Electric 1: $91.51 64In Stock 41Expected 05/11/2026	Mfr. Part No. XB5AS8442 Mouser Part No 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	64In Stock 41Expected 05/11/2026	$91.51	Min.: 1 Mult.: 1	Emergency Stop Switches		SPST	ON - (OFF)	Panel Mount
Emergency Stop Switches / E-Stop Switches E-STOP TTR W/ 2NC E-STOP TTR W/ 2NC XB5AS8444 Schneider Electric 1: $121.29 39In Stock	Mfr. Part No. XB5AS8444 Mouser Part No 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	39In Stock	$121.29	Min.: 1 Mult.: 1	Emergency Stop Switches
Emergency Stop Switches / E-Stop Switches E-STOP TTR W/ 1 NO & NC XB5AS8445 Schneider Electric 1: $121.28 29In Stock	Mfr. Part No. XB5AS8445 Mouser Part No 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	29In Stock	$121.28	Min.: 1 Mult.: 1	Emergency Stop Switches				Panel Mount
Switch Actuators MUSHROOM PB ZB4BS844 Schneider Electric 1: $67.99 305In Stock	Mfr. Part No. ZB4BS844 Mouser Part No 996-ZB4BS844	Schneider Electric	Switch Actuators MUSHROOM PB Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	305In Stock	$67.99	Min.: 1 Mult.: 1	Switch Actuators	Turn to Release
Switch Actuators TRIGGER ACTION TURN TO RELEASE 40MM RED ZB5AS844 Schneider Electric 1: $67.99 282In Stock	Mfr. Part No. ZB5AS844 Mouser Part No 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	282In Stock	$67.99	Min.: 1 Mult.: 1	Switch Actuators	Turn to Release
Switch Contact Blocks / Switch Kits N/O CONTACT BLOCK ZBE101 Schneider Electric 1: $12.05 3,191In Stock	Mfr. Part No. ZBE101 Mouser Part No 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	3,191In Stock	$12.05	Min.: 1 Mult.: 1	Switch Contact Blocks / Switch Kits	SPST
Switch Contact Blocks / Switch Kits N/C CONTACT BLOCK ZBE102 Schneider Electric 1: $12.05 2,821In Stock 328Expected 13/11/2026	Mfr. Part No. ZBE102 Mouser Part No 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	2,821In Stock 328Expected 13/11/2026	$12.05	Min.: 1 Mult.: 1	Switch Contact Blocks / Switch Kits	SPST
Emergency Stop Switches / E-Stop Switches D40 EMERGENCY STOP KR 455E XB4BS9442 Schneider Electric 1: $140.38 5In Stock	Mfr. Part No. XB4BS9442 Mouser Part No 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	5In Stock	$140.38	Min.: 1 Mult.: 1	Emergency Stop Switches				Panel Mount
Keylock Switches PUSHBUTTON OPERATOR 22MM XB4B XB4BS9445 Schneider Electric 1: $122.69 13In Stock	Mfr. Part No. XB4BS9445 Mouser Part No 996-XB4BS9445	Schneider Electric	Keylock Switches PUSHBUTTON OPERATOR 22MM XB4B Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	13In Stock	$122.69	Min.: 1 Mult.: 1	Keylock Switches	Key Release	SPDT	ON - (OFF), OFF - (ON)	Panel Mount
Emergency Stop Switches / E-Stop Switches E.stop PB metal red mushr pull 1NC XB4BT842 Schneider Electric 1: $58.43 15In Stock 9Expected 09/11/2026	Mfr. Part No. XB4BT842 Mouser Part No 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	15In Stock 9Expected 09/11/2026	$58.43	Min.: 1 Mult.: 1	Emergency Stop Switches		SPST	ON - (OFF)	Panel Mount
Emergency Stop Switches / E-Stop Switches PUSHBUTTON OPERATOR 22MM XB4B XB4BT845 Schneider Electric 1: $74.24 18In Stock	Mfr. Part No. XB4BT845 Mouser Part No 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	Min.: 1 Mult.: 1	Emergency Stop Switches				Panel Mount
Emergency Stop Switches / E-Stop Switches PUSHBUTTON 230VAC 2AMP XB5 XB5AS9445 Schneider Electric 1: $121.28 12In Stock	Mfr. Part No. XB5AS9445 Mouser Part No 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	Min.: 1 Mult.: 1	Emergency Stop Switches				Panel Mount
Emergency Stop Switches / E-Stop Switches E.stop PB plastic red mushr pull 1NC XB5AT842 Schneider Electric 1: $58.43 27In Stock	Mfr. Part No. XB5AT842 Mouser Part No 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	27In Stock	$58.43	Min.: 1 Mult.: 1	Emergency Stop Switches	Push-Pull	SPST	ON - (OFF)	Panel Mount
Switch Actuators TRIGGER ACTION KEY RELEASE 60MM RED ZB5AS964 Schneider Electric 1: $83.98 10In Stock	Mfr. Part No. ZB5AS964 Mouser Part No 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	Min.: 1 Mult.: 1	Switch Actuators	Pushbutton Head
Switch Actuators MUSHROOM PB OPERATOR ZB4BS834 Schneider Electric 1: $66.52 75In Stock	Mfr. Part No. ZB4BS834 Mouser Part No 996-ZB4BS834	Schneider Electric	Switch Actuators MUSHROOM PB OPERATOR Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	75In Stock	$66.52	Min.: 1 Mult.: 1	Switch Actuators	Head			Panel Mount
Switch Actuators PUSHBUTTON MUSHROOM HEAD 22MM XB4 ZB4BS84430 Schneider Electric 1: $68.91 212In Stock 656On Order	Mfr. Part No. ZB4BS84430 Mouser Part No 996-ZB4BS84430	Schneider Electric	Switch Actuators PUSHBUTTON MUSHROOM HEAD 22MM XB4 Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	212In Stock 656On Order On Order Ship Dates Mfr. No: ZB4BS84430 Stock: 212 Can Dispatch Immediately On Order: 210 Expected 05/11/2026 446 TBD Factory Lead Time: 7 Weeks	$68.91	Min.: 1 Mult.: 1	Switch Actuators	Pushbutton
Switch Actuators MUSHROOM PB ZB4BS944 Schneider Electric 1: $112.52 15In Stock	Mfr. Part No. ZB4BS944 Mouser Part No 996-ZB4BS944	Schneider Electric	Switch Actuators MUSHROOM PB Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	15In Stock	$112.52	Min.: 1 Mult.: 1	Switch Actuators	Key Operated
Switch Actuators MUSHROOM PB ZB4BT84 Schneider Electric 1: $36.53 30In Stock 86On Order	Mfr. Part No. ZB4BT84 Mouser Part No 996-ZB4BT84	Schneider Electric	Switch Actuators MUSHROOM PB Learn More about Schneider Electric xb4 zb4 22mm pushbuttons	Datasheet	30In Stock 86On Order On Order Ship Dates Mfr. No: ZB4BT84 Stock: 30 Can Dispatch Immediately On Order: 41 Expected 02/11/2026 45 Expected 16/11/2026 Factory Lead Time: 3 Weeks	$36.53	Min.: 1 Mult.: 1	Switch Actuators	Push-Pull
Switch Actuators TRIGGER ACTION TURN TO RELEASE 30MM RED ZB5AS834 Schneider Electric 1: $67.99 5In Stock 6Expected 09/11/2026	Mfr. Part No. ZB5AS834 Mouser Part No 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	5In Stock 6Expected 09/11/2026	$67.99	Min.: 1 Mult.: 1	Switch Actuators	Head			Panel Mount