SPST Pushbutton Switches 2,400+

Reset All

Part	Manufacturer	Switch Type	Mounting Feature	Switch Function	Type (Actuator)	AC Maximum Rating R Load (Contact)	Color (Actuator)	Dielectric Withstand Volts (V)	Electrical Life	Illumination	Insulation Resistance	Body Length/Diameter	Body Width	Sealing	Maximum Operating Force	Body Height	DC Maximum Rating R Load (Contact)	Maximum Operating Temperature	Maximum AC Contact Current	Minimum Operating Temperature	Length (Actuator)	Switch Action	Maximum DC Contact Current	Termination Type	Contact Resistance	Actuator Travel (mm)	Maximum DC Contact Voltage	Maximum AC Contact Voltage
A22NL-MMA-TGA-G002-GC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	GREEN	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.815 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RPM-NYA-G111-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-BMA-TGA-G101-GC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	GREEN	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.815 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-RMA-TRA-G100-RC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.815 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RMM-UAA-G122-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-MNA-TAA-G102-AE	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.531 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-MGM-NGA-G112-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	GREEN	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-MGM-UWA-G100-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	WHITE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-RMA-TAA-G202-AC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.815 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BPM-URA-G222-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-MNM-TRA-G100-RC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.531 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-BPA-TYA-G100-YC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.752 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BMM-NAA-G102-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RPM-URA-G101-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-MPM-UAA-G111-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BMA-NYA-G002-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RPM-NYA-G112-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-BNM-TRA-G101-RE	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.531 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-MMA-NAA-G101-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BNA-NRA-G222-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.433 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RMM-NYA-G100-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RMA-NYA-G122-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BNA-UAA-G122-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.531 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BGA-NGA-G122-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	GREEN	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RNM-NBA-G202-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	BLACK	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.433 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BPA-NBA-G100-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	BLACK	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BMM-NWA-G202-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	WHITE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-RMM-TRA-G202-RC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-MNA-TYA-G002-YC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.531 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RMM-URA-G122-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-MMA-NRA-G112-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-MPM-UYA-G122-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BMM-UYA-G101-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-MGM-TRA-G100-RC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-RMM-TWA-G002-WC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	WHITE	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RPM-UAA-G122-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-MNM-TGA-G102-GE	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	GREEN	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.531 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-MPA-UYA-G100-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RMM-NBA-G112-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	BLACK	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RPA-UYA-G002-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RPM-NWA-G222-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	WHITE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RMM-NRA-G102-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BNA-NAA-G112-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.433 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BGA-UYA-G100-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	YELLOW	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NL-RNA-TRA-G101-RC	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	RED	2500VAC	500000 Cycle(s)	LED		47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	55 Cel	10 A	-25 Cel	.531 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BPM-NBA-G112-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	BUTTON TYPE	10A@120VAC	BLACK	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.752 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-BMM-NBA-G111-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	MUSHROOM TYPE	10A@120VAC	BLACK	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.815 inch	MOMENTARY	8 A	SCREW	100 mohm	6	24 V	120 V
A22NN-RNA-UAA-G100-NN	Omron	PUSHBUTTON SWITCH	PANEL MOUNT	SPST	FLAT BUTTON	10A@120VAC	BLUE	2500VAC	500000 Cycle(s)	LED	100000000 ohm	47 mm	30 inch	IP66; MOISTURE PROOF	18 N	45.3 mm	8A@24VDC	70 Cel	10 A	-25 Cel	.531 inch	LATCHED	8 A	SCREW	100 mohm	6	24 V	120 V

Pushbutton Switches

Pushbutton switches are electronic switches that are activated by pressing a button or actuator. They are commonly used in a variety of applications, such as industrial control systems, consumer electronics, and medical devices.

Pushbutton switches typically consist of a housing, a button or actuator, and a set of electrical contacts. When the button or actuator is pressed, it completes a circuit between the contacts, allowing electrical current to flow through the switch.

Pushbutton switches come in different configurations, including momentary, latching, and toggle switches. Momentary switches are activated only while the button or actuator is pressed, while latching switches remain in the on or off position until manually reset. Toggle switches have a lever or toggle that can be flipped to turn the switch on or off.

Pushbutton switches offer several advantages over other types of switches. They provide a simple and easy-to-use means of controlling circuits, and they offer tactile feedback that can help to ensure reliable operation. They are also highly durable and can withstand frequent use and harsh environments.