XB4 Operators

The Schneider Electric Harmony XB4 Operators are a versatile range of rugged 22 mm metal push-button operators designed for industrial control and automation applications. They include momentary and maintained (push-on/push-off) push-buttons, as well as dual-head and triple-head operator stations, making them suitable for machine controls, motor starters, conveyor systems, packaging equipment, and process automation applications.

Refer to Catalog DIA5ED2121212EN

XB4 Operators

ZB4BA0	ZB4BA4
ZB4BA38	ZB4BP18
ZB4BL1	ZB4BA36

The XB4 operators range offers multiple actuator styles, including flush, extended, guarded, and booted designs, along with multiple color options. Operators are available with standard markings or with transparent legend holders for custom labeling. Selected models provide IP66 and IP69K protection ratings and optional silicone boots for enhanced resistance to dust, water, and washdown conditions. The following tables identify available operator styles, color options, markings, environmental protection features, and catalog numbers.

Non-Illuminated Operators, Momentary—Unmarked

Type of Push	Cap Color	Catalog Number
Flush, without color cap ^[1]	—	ZB4BA0
Flush, with set of 6 color caps	White Black Green Red Yellow Blue	ZB4BA9
Flush	White Black Green Red Yellow Blue Gray	ZB4BA1 ZB4BA2 ZB4BA3 ZB4BA4 ZB4BA5 ZB4BA6 ZB4BA8
Flush with transparent cap, for insertion of legend	White Green Red Yellow Blue	ZB4BA18 ZB4BA38 ZB4BA48 ZB4BA58 ZB4BA68
Booted Flush (clear silicone) Cap color unobscured	White Black Green Red Yellow Blue	ZB4BPA1 ZB4BPA2 ZB4BPA3 ZB4BPA4 ZB4BPA5 ZB4BPA6
Booted Extended (clear silicone) Cap color unobscured	White Black Green Red Yellow Blue	ZB4BP1 ZB4BP2 ZB4BP3 ZB4BP4 ZB4BP5 ZB4BP6
Booted (colored silicone) Cap color unobscured	White Black Green Red Yellow Blue	ZB4BP1S ZB4BP2S ZB4BP3S ZB4BP4S ZB4BP5S ZB4BP6S
Booted for insertion of legend (clear silicone) Cap color unobscured	White Green Red Yellow Blue	ZB4BP18 ZB4BP38 ZB4BP48 ZB4BP58 ZB4BP68
Extended	White Black Green Red Yellow Blue	ZB4BL1 ZB4BL2 ZB4BL3 ZB4BL4 ZB4BL5 ZB4BL6
Guarded Head	White Black Green Red Yellow Blue	ZB4BA16 ZB4BA26 ZB4BA36 ZB4BA46 ZB4BA56 ZB4BA66

ZB4BA331	ZB4BA334
ZB4BL432

Non-Illuminated Operators, Momentary—Premarked

Type of Push	Marking Text	Marking Color	Cap Color	Catalog Number
Flush	I	White	Green	ZB4BA331
	I	Black	White	ZB4BA131
	START	White	Green	ZB4BA333
	START	Black	White	ZB4BA133
	ON	White	Green	ZB4BA341
	ON	Black	White	ZB4BA141
	RESET	White	Black	ZB4BA222
	JOG	White	Black	ZB4BA245
	O	White	Red	ZB4BA432
	O	White	Black	ZB4BA232
	STOP	White	Red	ZB4BA434
	STOP	White	Black	ZB4BA234
	OFF	White	Red	ZB4BA435
	OFF	White	Black	ZB4BA235
	^[2]	Black	White	ZB4BA334
	^[2]	White	Black	ZB4BA335
Extended	O	White	Red	ZB4BL432
	O	White	Black	ZB4BL232
	STOP	White	Red	ZB4BL434
	STOP	White	Black	ZB4BL234
	OFF	White	Red	ZB4BL435
	OFF	White	Black	ZB4BL235

For Legend Holders, refer to XB4 Legend Holders.

Non-Illuminated Push-on/Push-off Operators

Type of Push	Color of Push	Catalog Number
Flush	White	ZB4BH01
	Black	ZB4BH02
	Green	ZB4BH03
	Red	ZB4BH04
	Yellow	ZB4BH05
	Blue	ZB4BH06
Extended	White	ZB4BH1
	Black	ZB4BH2
	Green	ZB4BH3
	Red	ZB4BH4
	Yellow	ZB4BH5
	Blue	ZB4BH6


ZB4BA73133	ZB4BA71124

Three Head Operators, Momentary

Shape of Head	Description	Marking	Cap Color	Degree of Protection	Catalog Number
Premarked
Two flush + one central projecting red push marked “Stop”	Two flush	“I” (white) “II” (white)	Green Green	IP66 IP69K	ZB4BA73132
		“” (white) “” (white)	Green Green		ZB4BA73133
		“” (white) “” (white)	Green Green		ZB4BA73134
		“+” (white) “-” (white)	Green Green		ZB4BA73135
		“+” (black) “-” (black)	White White		ZB4BA71115
		“” (black) “” (white)	White Black		ZB4BA71123
		“” (black) “” (white)	White Black		ZB4BA71124
		“” (white) “” (white)	Black Black		ZB4BA72124
Without caps
	Two flush without caps	—	—	IP66 IP69K	ZB4BA791


ZB4BA7121	ZB4BL7341

Two Head Operators, Momentary

Shape of Head	Description	Marking	Cap Color	Degree of Protection	Catalog Number
No Marking
	Two flush	—	Green Red	IP66 IP69K	ZB4BA7340
	Two flush	—	White Black		ZB4BA7120
	One flush One extended	—	Green Red		ZB4BL7340
Premarked
	Two flush	“I” (white) “O” (white)	Green Red	IP66 IP69K	ZB4BA7341
	Two flush	“I” (black) “O” (white)	White Black		ZB4BA7121
	One flush One extended	“I” (white) “O” (white)	Green Red		ZB4BL7341
Without caps
	Two flush without caps	—	—	IP66 IP69K	ZB4BA79

For Legend Holders, refer to XB4 Legend Holders.

Section 19: Push Buttons and Operator Interface

Section 19: Push Buttons and Operator Interface

XB4 Operators

Refer to Catalog DIA5ED2121212EN

XB4 Operators

Non-Illuminated Operators, Momentary—Unmarked

Non-Illuminated Operators, Momentary—Premarked

Non-Illuminated Push-on/Push-off Operators

Three Head Operators, Momentary

Two Head Operators, Momentary

Footnotes