Ring Switches | McMaster-Carr

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22 Products

Choosing a Proximity Switch

4-Pole
Micro
M12 Plug

Sense objects as they pass through the switch’s ring via tubing or a funnel. These switches are often used to monitor blockages, detect breaks in spooling wire, or count small metallic parts, such as screws, during the stamping process. Also known as inductive proximity switches, they sense metallic objects even if they’re obscured by water, oil, dirt, or a surface finish. Send their signal to programmable logic controllers (PLCs) to support automated processes within your system. Switches are CE marked and UL and C-UL listed to meet stringent domestic and international safety standards. Rated IP67, they’re protected against dust, washdowns, and temporary submersion.

These switches have a 4-pole micro M12 plug to connect to cables with socket (sold separately), allowing you to quickly connect and disconnect the switch.

To view switch wiring diagrams, select a part number and click Product Detail.

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

Switches
	For Object												Cables with Sockets
Switch Starting Position	Min. Dia., mm	Max. Speed, m/sec.	ID, mm	Signal Output Type	Switching Frequency, kHz	Input Voltage	Current Output	Lg., mm	Circuit Protection	Temp. Range, °F		Each		Each
Plastic Housing (IP67)
With 4-Pole Micro M12 Plug
1 Off (Normally Open) or 1 On (Normally Closed)	0.6	35	10	PNP	5	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	0000000	0000000	000000
1 Off (Normally Open) or 1 On (Normally Closed)	0.6	35	10	NPN	5	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	0.8	35	15	PNP	5	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	0.8	35	15	NPN	5	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	1	35	20	PNP	5	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	1	35	20	NPN	5	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	1.2	35	25	PNP	5	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	1.2	35	25	NPN	5	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	1.5	35	10	PNP	2	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	1.5	35	10	NPN	2	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	2	35	15	PNP	2	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	2	35	15	NPN	2	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	2.5	35	20	PNP	2	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	2.5	35	20	NPN	2	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	3	35	25	PNP	2	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	3	35	25	NPN	2	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000
1 Off (Normally Open) or 1 On (Normally Closed)	6	35	51	PNP	2	10V DC-35V DC	200mA	20	Overload Reverse Polarity Short Circuit	-10° to 155°	0000000	000000	0000000	00000

Hazardous Location Ring DC Metallic-Object Proximity Switches

Often used in the stamping process to count small metallic parts, such as screws, nuts, and washers, these switches detect objects as they pass through the ring via tubing or a funnel. Intrinsically safe, they produce a low-current, low-voltage NAMUR signal, so they won’t ignite or create sparks while in use. Switches meet ATEX international certification to protect against explosion in environments containing flammable gases. Prior to use, switches must be connected to the required barriers (sold separately), which reduce the current and voltage going into the hazardous location. While the switches can safely be used in hazardous areas, the barriers must be installed in a separate nonhazardous area.

Also known as inductive proximity switches, they sense objects even if they’re obscured by water, oil, dirt, or a surface finish. Send their signal to programmable logic controllers (PLCs) to support automated processes within your system. Switches meet various national and international safety standards, and they’re rated IP67 to protect against dust, washdowns, and temporary submersion.

To view switch wiring diagrams, select a part number and click Product Detail.

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

Switch

	For Object
Switch Starting Position	Min. Dia., mm	Max. Speed, m/sec.	ID, mm	Signal Output Type	Switching Frequency	Input Voltage	Current Output	No. of Wire Leads	Lg., mm	Cable Lead Lg., ft.	Temp. Range, °F	Environmental Rating		Each
Plastic Housing
With Wire Leads
1 On (Normally Closed)	2.5	36	10	NAMUR	2 kHz	5V DC-25V DC	10mA	2	20	6 1/2	0° to 145°	IEC Zone 1 Groups IIC, IIB, IIA IP67	0000000	0000000
1 On (Normally Closed)	3	27	15	NAMUR	1.5 kHz	5V DC-25V DC	10mA	2	20	6 1/2	0° to 145°	IEC Zone 1 Groups IIC, IIB, IIA 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