Anti-Tiedown Switches | McMaster-Carr

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Matching Flow Diagrams to Replace an Air Directional Control Valve

Choosing an Air Directional Control Valve

Choosing an Electrical Switch

Two-Hand Safety Switches

It takes two hands to activate these switches, minimizing the risk of accidental equipment start up. They have an emergency stop push-button to immediately cut power. They’re rated IP65 for protection from low-pressure washdowns.

Switches with push-button actuators require a safety relay (sold separately) for a complete system.

Switches with finger-touch actuators turn circuits on and off with a light touch, even when wearing gloves. An infrared sensor detects the lightest finger contact, and an indicator lights up to confirm when they are activated. Because they don't require you to press down a button to operate, they meet ANSI B11.TR1 standards to reduce hand, wrist, and arm fatigue. You'll need a relay or controller to complete your system—upgrade to a controller if you plan to operate additional devices beyond your switch.

Safety controller expansion modules can be added to safety controllers to increase the number of inputs.

Telescoping stands can be added to switches with finger-touch actuators to mount them away from a wall. The stands telescope to adjust the height of the switch and tilt to adjust the angle of the switch.

For technical drawings and 3-D models, click on a part number.

Switches

				Actuator						Mounting
No. of Circuits Controlled	Switch Starting Position	Switch Action	Industry Designation	Material	Color	Switching Current @ Voltage	Ht.	Wd.	Dp.	No. of Holes	Hole Dia.	Mounting Fasteners Included	Features		Each
Push-Button Actuators
2	1 Off (Normally Open) and 1 On (Normally Closed)	Springs Back (Momentary)	DPST-1NO/1NC	Plastic	Black	8 A @ 250 V AC, 5 A @ 24 V DC	7 5/16"	18 1/2"	5 7/16"	2	29/64"	No	Emergency Stop Button	00000000	0000000
Finger-Touch Actuators
2	1 Off (Normally Open) and 1 On (Normally Closed)	Springs Back (Momentary)	DPST-1NO/1NC	Plastic	Black	0.15 A @ 24 V DC	3 7/16"	18 11/16"	5 1/2"	4	21/64"	No	Emergency Stop Button, Output Indicator, Power Indicator	00000000	000000

Safety Relays for Switches with Push-Button Actuators

2 Circuits Contolled with 1 Off (Normally Open) and 1 On (Normally Closed)—DPST-1NO/1NC
Input Voltage	No. of Terminals	Switching Current @ Voltage	For DIN Rail Ht., mm	Wire Connection Type	Features		Each
24V DC	12	5.5 A @ 24 V DC	35	Screw Terminals	Self-Monitoring Circuitry	00000000	0000000

Safety Relays for Switches with Finger-Touch Actuators

				hp @ Switching Voltage
Input Voltage	No. of Terminals	Switching Current @ Voltage	Max. Switching Voltage	Single Phase	Three Phase	Auxiliary Contact Switch Starting Position (No. of Contacts)	For DIN Rail Size, mm	Wire Connection Type	Features	Max. System Safety Rating		Each
3 Circuits Controlled with 3 Off (Normally Open) or 3 On (Normally Closed)—3PST
24V DC	18	20 A @ 600 V AC	600V AC	1/2 hp @ 120 V AC 1 1/2 hp @ 240 V AC	3 hp @ 240 V AC 5 hp @ 480 V AC 7 1/2 hp @ 600 V AC	1 Off (Normally Open) (2) 1 On (Normally Closed) (3)	35	Screw-Clamp Terminals	Inspection Window, Interlocked Opposing Contacts, Mirror Contacts, Nondetachable Contacts, Recessed Terminals, Self-Monitoring Circuitry	PLe, SIL3, CAT 4, 600V	0000000	0000000

Safety Controllers for Switches with Finger-Touch Actuators

With USB Connection

LCD Display

With USB and Ethernet Connection

			USB Connection			Ethernet Connection
No. of Inputs	Input Voltage	Signal Output Type	Type	Standard	Gender	Type	Gender	Communication Protocol	For Max. No. of Expansion Modules	Ht.	Wd.	Dp.	Display Type		Each
USB Connection
26	24V DC	PNP	Micro B	2.0	Female	__	__	__	8	4 5/16"	1 3/4"	5 1/16"	LCD	00000000	000000000
USB and Ethernet Connection
26	24V DC	PNP	Micro B	2.0	Female	RJ45	Female	Ethernet/IP, Modbus TCP, Profinet	8	4 5/16"	1 3/4"	5 1/16"	__	00000000	00000000

Safety Controller Expansion Modules

Input Voltage	No. of Outputs	Signal Output Type	Ht.	Wd.	Dp.		Each
24V DC	4	PNP	4 5/16"	1"	5 1/16"	00000000	0000000

Telescoping Stands for Switches with Finger-Touch Actuators

						Base Mounting Holes		Head Mounting Holes
Ht.	Wd.	Dp.	Head Movement	Tilt Range of Motion	Material	No. of	Dia.	No. of	Dia.	Mounting Fasteners Included		Each
31 1/2"-48 1/2"	24 1/16"	24"	Tilt	30°	Steel	4	29/64"	2	5/16"	Yes	00000000	0000000

Mounting Brackets for Switches with Finger-Touch Actuators

				Mounting
Ht.	Wd.	Dp.	Material	No. of Holes	Hole Dia.	Mounting Fasteners Included		Each
5 15/16"	10 1/4"	3/8"	Steel	4	3/8"	Yes	00000000	000000

Replacement Finger-Touch Actuators

							Wire Leads
Input Voltage	Signal Output Type	Ht.	Wd.	Dp.	Thread Size	Cable Lg., ft.	No. of	Lg., ft.	Features		Each
10V DC-30V DC	PNP	2 5/16"	2 3/8"	1 11/16"	M30 × 1.5 mm	1	5	1	Output Indicator, Power Indicator	00000000	0000000

Two-Hand Two-Action Air Directional Control Valves

Since both hands are required to simultaneously press the buttons, these valves protect workers from accidental machinery start-up. Also known as 4-way and 4/2 valves, they create two actions, such as extending and then retracting a double-acting cylinder. They direct airflow from the inlet to your equipment and exhaust return airflow to create motion. Return actuation is by spring, so valves return to their original position as soon as you release the actuator.

Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.

For technical drawings and 3-D models, click on a part number.

											Overall
Actuation Force, oz.	No. of Flow Ports	Inlet Size	For Inlet Tube OD	Outlet Size	For Outlet Tube OD	Exhaust Connection Type	Max. Flow Rate, scfm @ 100 psi	Flow Coefficient (Cv)	Pressure Range, psi	Vacuum Rating	Lg.	Wd.	Ht.	Mounting Fasteners Included		Each
Threaded Female Inlet × Threaded Female Outlet
6	4	1/4 NPTF	1/4"	1/4 NPTF	1/4"	Threaded	56	1	70-100	Not Rated	10 1/2"	3 1/2"	3 3/16"	No	00000000	000000000
18	4	1/4 NPTF	1/4"	1/4 NPTF	1/4"	Threaded	56	1	70-100	Not Rated	10 1/2"	3 1/2"	3 3/16"	No	00000000	00000000

Two-Hand Single-Action Air Directional Control Valves

Since both hands are required to simultaneously press the buttons, these valves protect workers from accidental machinery start-up. Also known as 2-hand control valves, they create one action, such as extending a cylinder. Valves direct airflow from the inlet to your equipment and exhaust return airflow to create motion. They can be installed normally open to allow airflow until actuated, or installed to block airflow until actuated. Return actuation is by spring, so valves return to their starting position as soon as you release the actuator. These valves actuate any 3 or 4-way air piloted spring return power valve or small single-acting cylinders. In the off position, they exhaust air pressure from the system to the atmosphere, allowing equipment to reset so the action can be repeated.

Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.

For technical drawings and 3-D models, click on a part number.

								Overall
Actuation Force, oz.	No. of Flow Ports	Inlet Size	Outlet Size	Max. Flow Rate, scfm @ 100 psi	Flow Coefficient (Cv)	Pressure Range, psi	Vacuum Rating	Lg.	Wd.	Ht.	Mounting Fasteners Included		Each
Threaded Female Inlet × Threaded Female Outlet
6	2	1/8 NPT	1/8 NPT	6	0.11	70-100	Not Rated	10 1/2"	3 1/2"	3 3/16"	No	00000000	000000000
18	2	1/8 NPT	1/8 NPT	6	0.11	70-100	Not Rated	10 1/2"	3 1/2"	3 3/16"	No	00000000	00000000