Access Safety Switches | McMaster-Carr

	Actuator Style Actuator Style


Key	Hinge

Plunger

	Switching Voltage Switching Voltage

	Wire Connection Type Wire Connection Type


Screw Terminals	Wire Leads

	Maximum Voltage Maximum Voltage

	Number of Circuits Controlled Number of Circuits Controlled

	Switching Current Switching Current

	Switch Starting Position Switch Starting Position

1 Off (Normally Open) and 2
On (Normally Closed)

1 Off (Normally Open) and 1
On (Normally Closed)

2 Off (Normally Open) and 2
On (Normally Closed)

1 Off (Normally Open)

2 On (Normally Closed)

1 On (Normally Closed)

1 Off (Normally Open) and 4
On (Normally Closed)

2 Off (Normally Open) and 4
On (Normally Closed)

5 On (Normally Closed)

6 On (Normally Closed)

	Environment Environment

	Key Entry Key Entry

Side

Top

	Switch Action Switch Action

Stays Switched (Maintained)

Springs Back (Momentary)

	Number of Terminals Number of Terminals

	Key Included Key Included

Yes

	Housing Material Housing Material

Plastic

Metal

	Industry Designation Industry Designation

	Conduit Connection Gender Conduit Connection Gender

Female

Male

	Environmental Rating Environmental Rating

	Conduit Thread Type Conduit Thread Type

NPT

Metric

	Housing Depth Housing Depth

	Housing Width Housing Width

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Housing Height Housing Height

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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Choosing an Electrical Switch

Key Shown Actuating from the Side

Also known as interlock switches, these ensure the safety of personnel by automatically shutting off power to machinery when an access door opens. Mount the switch to the door frame and mount a key to the door so that the key is inserted into the switch when the door is closed. When the door opens, the key is removed from the switch and the machine shuts down. They’re often used with machine guards.

Style A-G switches have positive-force, normally closed contacts that will open a circuit when the switch is actuated even if a spring fails or the contacts stick.

NEMA 6 rated switches protect against temporary submersion and washdowns.

NEMA 4 rated switches protect against washdowns.

IP67 rated switches protect against temporary submersion.

Flexible keys (sold separately) pivot 15° to make it easier to align with the switch during installation.

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

Safety Switches

								Housing
Style	No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Ht.	Wd.	Dp.	Conduit Trade Size	Conduit Thread Size	Key Included	Environmental Rating		Each
Wire Lead Connection with Positive-Force Normally Closed Contacts
B	2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	2	DPST-1NO/1NC	8 A @ 120 V AC, 4 A @ 24 V DC	24V DC 250V AC	3.3"	1.2"	1.2"	__	M16	Yes	IP67	00000000	0000000
Screw Terminal Connection with Positive-Force Normally Closed Contacts
A	2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	5 A @ 120 V AC, 2 A @ 24 V DC	250V DC 500V AC	3"	1"	1.1"	1/2	__	Yes	NEMA 6, IP67	00000000	000000
C	2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	10 A @ 120 V AC, 2 A @ 24 V DC	24V DC 250V AC	3.6"	2.1"	1.3"	1/2	__	Yes	NEMA 4, IP65	00000000	000000
C	3	1 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	3	3PST-1NO/2NC	8 A @ 120 V AC, 4 A @ 24 V DC	250V DC 600V AC	3.5"	2.1"	1.2"	1/2	__	Yes	IP67	00000000	000000
C	3	1 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	6	3PST-1NO/2NC	4 A @ 230 V AC, 4 A @ 24 V DC	24V DC 500V AC	3.5"	2"	1.2"	__	M16	Yes	IP67	00000000	000000
D	3	1 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	6	3PST-1NO/2NC	6 A @ 120 V AC, 0.27 A @ 24 V DC	240V AC 250V DC	3.8"	1.2"	1.2"	1/2	__	Yes	IP67	00000000	00000
F	2	1 Off (Normally Open) and 1 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-1NO/1NC	8 A @ 230 V AC, 5 A @ 24 V DC	24V DC 400V AC	4.2"	2"	1.6"	__	M20	No	IP67	00000000	00000
F	2	2 On (Normally Closed)	Stays Switched (Maintained)	4	DPST-NC	8 A @ 230 V AC, 5 A @ 24 V DC	24V DC 400V AC	4.2"	2"	1.6"	__	M20	No	IP67	00000000	00000
G	4	2 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	8	4PST-2NO/2NC	6 A @ 230 V AC, 4 A @ 24 V DC	24V DC 250V AC	4.1"	3.3"	1.8"	__	M20	No	IP67	00000000	000000
Screw Terminal Connection with Positive-Force Normally Closed Contacts and Rotating Head
C	3	1 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	6	3PST-1NO/2NC	6 A @ 120 V AC, 2.5 A @ 24 V DC	250V DC 500V AC	3.9"	2.3"	1.3"	1/2	__	Yes	NEMA 6, IP67	00000000	000000
E	3	1 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	6	3PST-1NO/2NC	10 A @ 120 V AC, 2.5 A @ 125 V DC	120V AC 125V DC	3.8"	1.2"	1.2"	__	M20	No	IP67	00000000	00000
E	3	1 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	6	3PST-1NO/2NC	10 A @ 230 V AC, 4 A @ 24 V DC	24V DC 250V AC	4.3"	1.6"	1.4"	__	M20	No	IP67	00000000	000000
Screw Terminal Connection with Rotating Head
H	4	2 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	8	4PST-2NO/2NC	2.5 A @ 120 V AC, 1 A @ 125 V DC	120V AC 125V DC	7.1"	1.5"	1.5"	1/2	__	No	IP67	00000000	000000
H	5	1 Off (Normally Open) and 4 On (Normally Closed)	Stays Switched (Maintained)	10	5PST-1NO/4NC	2.5 A @ 120 V AC, 1 A @ 125 V DC	120V AC 125V DC	6.1"	1.5"	1.5"	1/2	__	No	IP67	00000000	000000
H	5	1 Off (Normally Open) and 4 On (Normally Closed)	Stays Switched (Maintained)	10	5PST-1NO/4NC	2.5 A @ 120 V AC, 1 A @ 125 V DC	120V AC 125V DC	7.1"	1.5"	1.5"	__	M20	No	IP67	00000000	000000
H	5	1 Off (Normally Open) and 4 On (Normally Closed)	Stays Switched (Maintained)	10	5PST-1NO/4NC	2.5 A @ 120 V AC, 1 A @ 125 V DC	120V AC 125V DC	7.1"	1.5"	1.5"	1/2	__	No	IP67	00000000	000000
H	5	5 On (Normally Closed)	Stays Switched (Maintained)	10	5PST-5NC	2.5 A @ 120 V AC, 1 A @ 125 V DC	120V AC 125V DC	7.1"	1.5"	1.5"	__	M20	No	IP67	00000000	000000
H	5	5 On (Normally Closed)	Stays Switched (Maintained)	10	5PST-5NC	2.5 A @ 120 V AC, 1 A @ 125 V DC	120V AC 125V DC	7.1"	1.5"	1.5"	1/2	__	No	IP67	00000000	000000
H	6	2 Off (Normally Open) and 4 On (Normally Closed)	Stays Switched (Maintained)	12	6PST-2NO-4NC	2.5 A @ 120 V AC, 1 A @ 125 V DC	120V AC 125V DC	7.1"	1.5"	1.5"	1/2	__	No	IP67	00000000	000000
H	6	6 On (Normally Closed)	Stays Switched (Maintained)	12	6PST-6NC	2.5 A @ 120 V AC, 1 A @ 125 V DC	120V AC 125V DC	7.1"	1.5"	1.5"	1/2	__	No	IP67	00000000	000000

Replacement Actuator Keys

			O'all
	Angle Range	Adjustability	Lg.	Wd.	Mounting Fasteners Included		Each
Straight Keys
For 65665K19	__	__	86mm	32mm	No	00000000	000000
For Style F	__	__	80mm	32mm	No	00000000	0000
For Style G	__	__	114mm	35mm	No	00000000	00000
For Style H	__	__	48.5mm	35mm	No	00000000	00000
90° Angle Keys
For Style F	__	__	65.5mm	32mm	No	00000000	00000
Flexible Keys
For Style D	0°-15°	Up/Down/Left/Right	48.9mm	55mm	No	000000000	00000
For 65665K29	0°-15°	Up/Down/Left/Right	50.4mm	55mm	No	00000000	00000
For 65665K19	0°-15°	Up/Down/Left/Right	105mm	40mm	No	00000000	00000

Hinge-Actuated Safety Switches

Replace access door hinges with these switches; they actuate when the door opens at least 4°. Also known as interlock switches, they ensure the safety of personnel by automatically shutting off power to machinery when an access door opens. All have positive-force, normally-closed contacts that will open a circuit when the switch is actuated even if a spring fails or the contacts stick. In addition to access doors, these switches can also be used on machine guards constructed from aluminum T-slotted framing. They’re rated IP65 for protection from washdowns.

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

								Overall
No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Wire Connection Type	Conduit Thread Size	Ht.	Wd.	Dp.		Each
3	1 Off (Normally Open) and 2 On (Normally Closed)	Springs Back (Momentary)	6	3PST-1NO/2NC	2 A @ 250 V AC	Screw Terminals	M20	3.62"	4.39"	1.42"	0000000	0000000

Access-Delay Frame-Mounted Safety Switches

Key Shown Actuating from the Side

Delay access to hazardous areas until conditions are safe; use these switches with machines that take time to stop after they are turned off. Mount the switch to the door frame and mount the key to the door so that the key is inserted into the switch when the door is closed. When the door is pulled, the key is held in place with 225 lbs. of force until the switch receives a signal from a time-delay relay, motion sensor, or position sensor (not included) that the machine’s motion has stopped. After the motion has stopped, the key can be removed from the switch, releasing the access door. They’re often used with machine guards. All have positive-force, normally-closed contacts that will open a circuit when the switch is actuated even if a spring fails or the contacts stick. They’re rated for protection from washdowns and temporary submersion.

Style A and B have a key entry on the top and side of the switch.

Style C has a key entry on two opposite sides of the switch.

Emergency override keys (sold separately) bypass the access delay feature.

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

										Housing
Style	No. of Circuits Controlled	Switch Starting Position	Switch Action	No. of Terminals	Industry Designation	Switching Current @ Voltage	Max. Voltage	Input Voltage	Holding Force, lbs.	Ht.	Wd.	Dp.	Wire Connection Type	Conduit Trade Size		Each
Positive-Force Normally Closed Contacts
A	3	1 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	6	3PST-1NO/2NC	5 A @ 120 V AC, 2 A @ 24 V DC	500V AC 250V DC	24V AC, 24V DC	225	4.7"	2.3"	1.4"	Screw Terminals	1/2	0000000	0000000
A	3	1 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	6	3PST-1NO/2NC	5 A @ 120 V AC, 2 A @ 24 V DC	500V AC 250V DC	110V AC	225	4.7"	2.3"	1.4"	Screw Terminals	1/2	0000000	000000
B	3	1 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	14	3PST-1NO/2NC	3 A @ 120 V AC, 2.5 A @ 24 V DC	250V DC 240V AC	24V DC	225	3.7"	3.5"	1.4"	Screw Terminals	1/2	0000000	000000
Positive-Force Normally Closed Contacts and Rotating Head
C	4	2 Off (Normally Open) and 2 On (Normally Closed)	Stays Switched (Maintained)	8	4PST-2NO/2NC	4 A @ 120 V AC, 4 A @ 24 V DC	240V AC 24V DC	24V AC, 24V DC	225	7.6"	1.2"	1.6"	Screw Terminals	1/2	0000000	000000

Emergency Override Key for Style A

0000000

Each

000000

Enclosure Door Switches

Turn fans, lights, alarms, and other components mounted inside an enclosure on or off when you open or close the enclosure door. Designed to work with a variety of enclosures, these switches have an adjustable housing that lets you alter the length of the switching travel up to 1 3/8". They also have mounting slots, so you can mount screws anywhere along the 0.81" slot length.

Normally open switches turn a component on when you close the door.

Normally closed switches turn a component on when you open the door.

Normally open and normally closed switches control two components at the same time. Use them to turn one component on while also turning another one off when you open the door.

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

				Switching			For Wire
Number of Circuits Controlled	Switch Action	Number of Terminals	Industry Designation	Current, A	Voltage	Maximum Voltage	Gauge	Number of	Overall Length	Environmental Rating	Specifications Met		Each
Plastic Actuator with Wire Leads
1 Off (Normally Open)
1	Springs Back (Momentary)	4	SPST-NO	8	250V AC	250V AC	16-14	2	4 1/4"	IP20	CE Marked	0000000	000000
1 On (Normally Closed)
1	Springs Back (Momentary)	2	SPST-NC	8	250V AC	250V AC	16-14	2	4 1/4"	IP20	CE Marked	0000000	00000
1 Off (Normally Open) and 1 On (Normally Closed)
2	Springs Back (Momentary)	4	DPST-1NO/1NC	8	250V AC	250V AC	16-14	2	4 1/4"	IP20	CE Marked	0000000	00000

Enclosure Disconnect Switches

Install these switches inside an enclosure to prevent it from opening when power is on—turn the switch to disconnect power and release the door. Cut the shaft to fit the enclosure. Use a padlock (not included) to lock switches in the off position. Mount to DIN rail inside an enclosure; mounting depth is the distance from the panel door to the DIN rail. UL listed, C-UL listed, and CE marked, these switches meet American, Canadian, and European safety standards.

Use optional sealing gaskets in washdown environments; they create an IP65 rated seal around the actuator.

Add auxiliary contact blocks to send a signal or connect to another device, such as an alarm or indicating light.

Use additional power poles to control more than three circuits. Add neutral poles to open and close the neutral leg of a three phase system.

Add junction blocks to connect a ground wire.

Terminal covers prevent contact with live terminals.

3 Circuits

4 Circuits

Switching
Current, A	Voltage	Electrical Phase (hp)	Ht.	Wd.	For DIN Rail Ht., mm	Mounting Dp.	Environmental Rating		Each
Yellow Plastic Housing with Red Actuator
3 Circuits with Lockout—For 1 3/16" Panel Cutout Dia.
25	600V AC	Single (3/4 hp @ 120 V AC) Single (1 1/2 hp @ 240 V AC) Three (1 1/2 hp @ 120 V AC) Three (3 hp @ 240 V AC)	2 5/8"	2 5/8"	35	4 7/8"-15 3/4"	IP40	0000000	000000
32	600V AC	Single (1 hp @ 120 V AC) Single (2 hp @ 240 V AC) Three (2 hp @ 120 V AC) Three (5 hp @ 240 V AC)	2 5/8"	2 5/8"	35	4 7/8"-15 3/4"	IP40	0000000	00000
50	600V AC	Single (1 1/2 hp @ 120 V AC) Single (3 hp @ 240 V AC) Three (3 hp @ 120 V AC) Three (7 1/2 hp @ 240 V AC)	2 5/8"	2 5/8"	35	5 5/16"-16 1/8"	IP40	0000000	00000
63	600V AC	Single (3 hp @ 120 V AC) Single (5 hp @ 240 V AC) Three (5 hp @ 120 V AC) Three (10 hp @ 240 V AC)	2 5/8"	2 5/8"	35	5 5/16"-16 1/8"	IP40	0000000	00000
80	600V AC	Single (3 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (7 1/2 hp @ 120 V AC) Three (20 hp @ 240 V AC)	3 3/8"	3 3/8"	35	5 11/16"-16 1/2"	IP40	0000000	000000
100	600V AC	Single (5 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (10 hp @ 120 V AC) Three (25 hp @ 240 V AC)	3 3/8"	3 3/8"	35	5 11/16"-16 1/2"	IP40	0000000	000000
4 Circuits with Lockout—For 1 3/16" Panel Cutout Dia.
25	600V AC	Single (3/4 hp @ 120 V AC) Single (1 1/2 hp @ 240 V AC) Three (1 1/2 hp @ 120 V AC) Three (3 hp @ 240 V AC)	2 5/8"	2 5/8"	35	4 7/8"-15 3/4"	IP40	0000000	00000
32	600V AC	Single (1 hp @ 120 V AC) Single (2 hp @ 240 V AC) Three (2 hp @ 120 V AC) Three (5 hp @ 240 V AC)	2 5/8"	2 5/8"	35	4 7/8"-15 3/4"	IP40	0000000	00000
50	600V AC	Single (1 1/2 hp @ 120 V AC) Single (3 hp @ 240 V AC) Three (3 hp @ 120 V AC) Three (7 1/2 hp @ 240 V AC)	2 5/8"	2 5/8"	35	5 5/16"-16 1/8"	IP40	0000000	000000
63	600V AC	Single (3 hp @ 120 V AC) Single (5 hp @ 240 V AC) Three (5 hp @ 120 V AC) Three (10 hp @ 240 V AC)	2 5/8"	2 5/8"	35	5 5/16"-16 1/8"	IP40	0000000	000000
80	600V AC	Single (3 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (7 1/2 hp @ 120 V AC) Three (20 hp @ 240 V AC)	3 3/8"	3 3/8"	35	5 11/16"-16 1/2"	IP40	0000000	000000
100	600V AC	Single (5 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (10 hp @ 120 V AC) Three (25 hp @ 240 V AC)	3 3/8"	3 3/8"	35	5 11/16"-16 1/2"	IP40	0000000	000000
Gray Plastic Housing with Gray Actuator
3 Circuits with Lockout—For 1 3/16" Panel Cutout Dia.
25	600V AC	Single (3/4 hp @ 120 V AC) Single (1 1/2 hp @ 240 V AC) Three (1 1/2 hp @ 120 V AC) Three (3 hp @ 240 V AC)	2 5/8"	2 5/8"	35	4 7/8"-15 3/4"	IP40	0000000	00000
32	600V AC	Single (1 hp @ 120 V AC) Single (2 hp @ 240 V AC) Three (2 hp @ 120 V AC) Three (5 hp @ 240 V AC)	2 5/8"	2 5/8"	35	4 7/8"-15 3/4"	IP40	0000000	00000
50	600V AC	Single (1 1/2 hp @ 120 V AC) Single (3 hp @ 240 V AC) Three (3 hp @ 120 V AC) Three (7 1/2 hp @ 240 V AC)	2 5/8"	2 5/8"	35	5 5/16"-16 1/8"	IP40	0000000	00000
63	600V AC	Single (3 hp @ 120 V AC) Single (5 hp @ 240 V AC) Three (5 hp @ 120 V AC) Three (10 hp @ 240 V AC)	2 5/8"	2 5/8"	35	5 5/16"-16 1/8"	IP40	0000000	00000
80	600V AC	Single (3 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (7 1/2 hp @ 120 V AC) Three (20 hp @ 240 V AC)	3 3/8"	3 3/8"	35	5 11/16"-16 1/2"	IP40	0000000	000000
100	600V AC	Single (5 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (10 hp @ 120 V AC) Three (25 hp @ 240 V AC)	3 3/8"	3 3/8"	35	5 11/16"-16 1/2"	IP40	0000000	000000

Replacement Shaft	Each	000000
Auxiliary Contact Block	Each	00000
Replacement Shaft Base	Each	0000

Replacement Actuator for 3 Circuit Switches with Lockout

				Yellow Plastic Housing with Red Actuator		Gray Plastic Housing with Gray Actuator
For Switching Current	Ht.	Wd.	Dp.		Each		Each
25A, 32A, 50A, 63A	2 9/16"	2 9/16"	1 5/16"	0000000	000000	0000000	000000
80A, 100A	3 3/8"	3 3/8"	1 5/16"	0000000	00000	0000000	00000

Optional Sealing Gaskets

For Switching Voltage, A		Each
25-63	0000000	00000
80/100	0000000	0000

Additional Power Poles

Switching Current, A	Specifications Met		Each
25	UL Listed, CE Marked	00000000	000000
32	UL Listed, CE Marked	00000000	00000
50	UL Listed, CE Marked	00000000	00000
63	UL Listed, CE Marked	00000000	00000
80	UL Listed, CE Marked	00000000	00000
100	UL Listed, CE Marked	00000000	00000

Neutral Poles

Switching Current, A	Specifications Met		Each
25	UL Listed, CE Marked	00000000	000000
32	UL Listed, CE Marked	00000000	00000
50	UL Listed, CE Marked	00000000	00000
63	UL Listed, CE Marked	00000000	00000
80	UL Listed, CE Marked	00000000	00000
100	UL Listed, CE Marked	00000000	00000

Junction Blocks

For Current, A	Specifications Met		Each
25/32	UL Listed, CE Marked	00000000	000000
50/63	UL Listed, CE Marked	00000000	00000
80/100	UL Listed, CE Marked	00000000	00000

Terminal Covers

For Use With		Each
50/63A Power Pole, Neutral Pole, or Junction Block	0000000	00000
25/32A Power Pole, Neutral Pole, or Junction Block	0000000	0000
80/100A Power Pole, Neutral Pole, or Junction Block	0000000	0000
25/32A Switch Contact Block	0000000	0000
50/63A Switch Contact Block	0000000	0000
80/100A Switch Contact Block	0000000	0000
Auxiliary Contact Block	0000000	0000