10mA Switches | McMaster-Carr

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Choosing a Proximity Switch

Choosing an Electrical Switch

Hazardous Location Photoelectric Switches

Safely detect the presence or absence of an object moving at high speeds with a light beam. These switches produce a low-current, low-voltage NAMUR signal, so they won’t create sparks or ignite in hazardous locations. ATEX and IECEx certified, they meet international standards to protect against explosion in environments containing flammable gases and combustible dust. Switches must be connected to the required barriers (sold separately), which reduce the current and voltage flowing from your power source. Unlike the switches, the barriers must be installed in a separate nonhazardous area.

These switches can send a signal to programmable logic controllers (PLCs) to support automated processes within your system. They are CE marked to meet European health, safety, and environmental protection requirements. Rated IP67, they’re protected against dust, washdowns, and temporary submersion.

Direct-sensing switches detect objects when light reflects back from the object. They have a shorter sensing distance than reflector sensors but don’t require a separate reflector.

Reflector switches detect an object when it passes between the switch and the reflector (not included), interrupting the beam. They have a longer sensing distance than direct-sensing switches.

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

Switch

				Switching
Light Beam Switch Operation	Max. Sensing Distance	Switch Starting Position	Input Voltage	Voltage	Current	Frequency	Signal Output Type	Lg., mm	Wd., mm	Ht., mm	Housing Material	Temp. Range, °F	Environmental Rating		Each
With Screw Terminals
Direct Sensing Switches with Infrared Light Beam
On When Object Absent, On When Object Present	300 mm	1 Off (Normally Open) or 1 On (Normally Closed)	6V DC-20V DC	8V DC	10mA	100 Hz	NAMUR	100	30	30	Plastic	-10° to 155°	IEC Zone 1 Groups IIC, IIB, IIA IEC Zone 20 Groups IIIC, IIIB, IIIA IP67	0000000	0000000
Reflector Switches with Visible Light Beam
On When Object Absent, On When Object Present	2 m	1 Off (Normally Open) or 1 On (Normally Closed)	6V DC-20V DC	8V DC	10mA	100 Hz	NAMUR	102	30	30	Plastic	-10° to 155°	IEC Zone 1 Groups IIC, IIB, IIA IEC Zone 20 Groups IIIC, IIIB, IIIA IP67	0000000	000000

Barriers

Barrier

	Inputs				Outputs
Operating Voltage	Voltage	Current	No. of	Signal Type	Current	No. of	Signal Type	Switching Frequency	Environmental Rating		Each
Plastic Housing
115V AC	10V DC	8mA	1	NAMUR	2 A @ 253 V AC 2 A @ 40 V DC 4 A @ 126 V AC	1	Relay	10 Hz	Associated Apparatus for IEC Zone 0 Groups IIC, IIB, IIA Associated Apparatus for IEC Zone 20 Groups IIIC, IIIB, IIIA IP20	0000000	0000000
24V DC	10V DC	8mA	1	NAMUR	0.05 A @ 24 V DC	2	Transistor	5 kHz	Associated Apparatus for IEC Zone 0 Groups IIC, IIB, IIA Associated Apparatus for IEC Zone 20 Groups IIIC, IIIB, IIIA IP20	0000000	000000

Tamper-Resistant Magnetically Actuated Switches

Two- and Three-Circuit Switch

Coded Magnet for Two- and Three-Circuit Switch

Prevent unauthorized use—these switches require coded magnets (sold separately) to actuate, and cannot be bypassed using ordinary magnets. They actuate when a magnet comes within sensing distance, and reset when the magnet moves away. Mount the switch in a stationary position, such as a door frame, and mount the magnet to a movable object, such as the door. They’re often used to detect when a door or window opens, and can be used with movable machine guards. All are rated IP67 for protection from temporary submersion.

Coded magnets include tamper-resistant one-way screws for mounting. To remove screws, see one-way bits and drivers.

Safety relays are required in safety applications with switches that control two or three circuits.

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

Switches													Coded Magnets		Safety Relays
No. of Circuits Controlled	Switch Starting Position	Industry Designation	Switching Current @ Voltage	Max. Voltage	Input Voltage	Max. Sensing Distance	Lg.	Wd.	Ht.	Environmental Rating		Each		Each		Each
Plastic Housing with Wire Leads
3	1 Off (Normally Open) and 2 On (Normally Closed)	3PST-1NO/2NC	10 mA @ 24 V DC	24V DC	24V DC	0.2"	3.5"	1"	0.5"	IP67	0000000	0000000	0000000	000000	0000000	0000000